Updated on 2024/12/20

Information

 

写真a

 
ARAKAWA HIROYUKI
 
Organization
Faculty of Medical Sciences Department of Health Sciences Associate Professor
School of Medicine Department of Health Sciences（Concurrent）
Graduate School of Medical Sciences Department of Health Sciences（Concurrent）
Title
Associate Professor
Contact information
メールアドレス
Profile
令和3年度からの原子力規制人材育成事業における「実践的な課題解決能力を持つ高度放射線防護人材育成プログラム」実施のための研究・教育業務を行っている。 また、令和６年度から医用工学に関係する講義・実験を担当している。
External link

Research Areas

  • Energy Engineering / Quantum beam science

  • Energy Engineering / Nuclear fusion

  • Life Science / Radiological sciences

  • Energy Engineering / Fundamental plasma

Degree

  • Ph.D in Science (Kyushu University)

Research History

  • Shimane University Associate Professor

    2018.4 - 2022.6

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  • 2011年4月〜2014年3月 日本原子力研究開発機構 核融合研究開発部門 博士研究員 2014年4月〜2018年3月 帝京大学 福岡医療技術学部 診療放射線学科 助教 2018年4月〜2022年6月 島根大学 学術研究院 理工学系 准教授

Research Interests・Research Keywords

  • Research theme：放射線防護教育

    Keyword：放射線防護教育

    Research period： 2024

  • Research theme：放射線計測

    Keyword：放射線計測

    Research period： 2024

  • Research theme：圧縮センシング

    Keyword：圧縮センシング

    Research period： 2024

  • Research theme：医療用放射線シミュレーション

    Keyword：医療用放射線シミュレーション

    Research period： 2024

  • Research theme：乱流

    Keyword：乱流

    Research period： 2024

  • Research theme：レーザー計測

    Keyword：レーザー計測

    Research period： 2024

  • Research theme：プラズマ計測

    Keyword：プラズマ計測

    Research period： 2024

  • Research theme：プラズマ物理

    Keyword：プラズマ物理

    Research period： 2024

  • Research theme：プラズマ・核融合

    Keyword：プラズマ・核融合

    Research period： 2024

  • Research theme：MRI解析

    Keyword：MRI解析

    Research period： 2024

  • Research theme：CT

    Keyword：CT

    Research period： 2024

  • Research theme：Development of radiation protection teaching materials using Virtual Reality, Mixed Reality, 3D printers, etc.

    Keyword：Virtual Reality, Mixed Reality, 3D printer

    Research period： 2022.7 - 2024.3

  • Research theme：Development of real-time measurement methods for the radiation source position of brachytherapy

    Keyword：High dose-rate brachytherapy, RALS, dynamic measurement

    Research period： 2020.4 - 2027.3

Awards

  • Certificate of Merit Award

    2022.5   The 1st International Conference on Radiological Physics and Technology   Certificate of Merit Award

  • Certificate of Merit Award

    2022.5  

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  • Cypos賞Silver Award

    2020.6   第７６回日本放射線技術学会学術大会  

  • RADIOISOTOPES誌 論文奨励賞

    2018.7   公益社団法人日本アイソトープ協会  

  • 2017年度プラズマ・核融合学会賞 若手学会発表賞

    2017.11   プラズマ・核融合学会  

  • 冲永荘一学術文化奨励賞

    2017.3   帝京大学  

  • 第72回日本放射線技術学会総合学術大会 Premium Awards

    2016.4   日本放射線技術学会  

  • プラズマ核融合学会第21回論文賞

    2013.12   プラズマ核融合学会  

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Papers

  • Optimum delineation of skin structure for dose calculation with the linear Boltzmann transport equation algorithm in radiotherapy treatment planning.

    Keisuke Hamada, Toshioh Fujibuchi, Hiroyuki Arakawa

    Radiological physics and technology   17 ( 4 )   938 - 946   2024.9   （ ISSN:1865-0333 eISSN:1865-0341 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    This study investigated the effectiveness of placing skin-ring structures to enhance the precision of skin dose calculations in patients who had undergone head and neck volumetric modulated arc therapy using the Acuros XB algorithm. The skin-ring structures in question were positioned 2 mm below the skin surface (skin A) and 1 mm above and below the skin surface (skin B) within the treatment-planning system. These structures were then tested on both acrylic cylindrical and anthropomorphic phantoms and compared with the Gafchromic EBT3 film (EBT3). The results revealed that the maximum dose differences between skins A and B for the cylindrical and anthropomorphic phantoms were approximately 12% and 2%, respectively. In patients 1 and 2, the dose differences between skins A and B were 9.2% and 8.2%, respectively. Ultimately, demonstrated that the skin-dose calculation accuracy of skin B was within 2% and did not impact the deep organs.

    DOI： 10.1007/s12194-024-00840-8

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  • Evaluation of radiation protection effectivity in a cardiac angiography room using visualized scattered radiation distribution. International journal

    Toshioh Fujibuchi, Misaki Nakashima, Hiroyuki Arakawa, Hitoshi Miyazaki, Choirul Anam

    Journal of radiological protection : official journal of the Society for Radiological Protection   44 ( 3 )   2024.9   （ ISSN:0952-4746 eISSN:1361-6498 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    In this study, we devised a radiation protection tool specifically designed for healthcare professionals and students engaged in cardiac catheterization to easily monitor and evaluate scattered radiation distribution across diverse C-arm angles and arbitrary physician associated staff positions-scrub nurse and technologist positions. In this study, scattered radiation distributions in an angiography room were calculated using the Monte Carlo simulation of particle and heavy ion transport code system (PHITS) code. Four visualizations were performed under different C-arm angles with and without radiation protection: (1) a dose profile, (2) a 2D cross-section, (3) a 3D scattered radiation distribution, and (4) a 4D scattered radiation distribution. The simulation results detailing the scattered radiation distribution in PHITS were exported in Visualization Toolkit format and visualized through the open-source visualization application ParaView for analysis. Visualization of the scattered dose showed that dose distribution depends on the C-arm angle and the x-ray machine output parameters (kV, mAs s-1, beam filtration) which depend upon beam angulation to the patient body. When irradiating in the posterior-anterior direction, the protective curtain decreased the dose by 62% at a point 80 cm from the floor, where the physician's gonads are positioned. Placing the protection board close to the x-ray tube reduced the dose by 24% at a location 160 cm from the floor, where the lens of the eye is situated. Notably, positioning the protection board adjacent to the physician resulted in a 95.4% reduction in incident air kerma. These visualization displays can be combined to understand the spread and direction of the scattered radiation distribution and to determine where and how to operate and place radiation protection devices, accounting for the different beam angulations encountered in interventional cases. This study showed that scatter visualization could be a radiation protection teaching aid for students and medical staff in angiography rooms.

    DOI： 10.1088/1361-6498/ad6d75

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  • Developing simulation-based learning application for radiation therapy students at pre-clinical stage International journal

    Nafise Hasoomi, Toshioh Fujibuchi, Hiroyuki Arakawa

    Journal of Medical Imaging and Radiation Sciences   55 ( 3 )   101412 - 101412   2024.9   （ ISSN:1939-8654 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    INTRODUCTION: Simulation-based education has been particularly valuable as a preclinical training method that adequately prepares students for clinical practice, including simulation in educational programs enhances the quality of learning outcomes. However, relevant previous research has exhibited several crucial limitations, with most of them having focused solely on the setup procedures. This study aimed to outline the development of an educational application in radiationtherapy and emphasizes the essential factors that radiation therapist technologists(RTTs) must consider in the treatment room from the perspective of experienced RTTs. METHOD: We connected the virtual pendants to the linear accelerator components using C# programming and Unity. Customized scripts were assigned to specific linear accelerator (LINAC) functions, and the patient and RTT avatars were developed. We also included audio feedback for the realistic gantry movement sounds. RESULT: This study outlines various aspects of radiotherapy procedures duringtreatment, such as the simulation of patient positioning, treatment fields, and pendantfunctions, aimed toward enabling the effective use of virtual reality technology inradiation therapy. DISCUSSION: This study explores the potential of an avatar-based app for radiotherapy education, providing foundational data for future trials. CONCLUSION: Simulation learning is the most advantageous pre-clinical instrument for equipping students with the skills necessary for clinical practice. This study's resultsare expected to facilitate radiotherapy students' adoption of clinical replacement applications and improve collaborative partnerships and knowledge sharing. Notably, this application complements traditional learning methods, further enhancing the overall educational experience.

    DOI： 10.1016/j.jmir.2024.04.005

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  • 含鉛および無鉛素材の放射線防護衣における透過X線スペクトルや鉛当量,均一度の評価

    矢野 祐二, 藤淵 俊王, 荒川 弘之

    日本放射線技術学会雑誌   80 ( 9 )   944 - 954   2024.9   （ ISSN:0369-4305 ）

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    Language：Japanese   Publisher：(公社)日本放射線技術学会  

  • The Usefulness of a Virtual Environment-Based Patient Setup Training System for Radiation Therapy. International journal

    Toshioh Fujibuchi, Kosuke Kaneko, Hiroyuki Arakawa, Yoshihiro Okada

    Journal of imaging   10 ( 8 )   2024.8   （ eISSN:2313-433X ）

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    In radiation therapy, patient setup is important for improving treatment accuracy. The six-axis couch semi-automatically adjusts the patient's position; however, adjusting the patient to twist is difficult. In this study, we developed and evaluated a virtual reality setup training tool for medical students to understand and improve their patient setup skills for radiation therapy. First, we set up a simulated patient in a virtual space to reproduce the radiation treatment room. A gyro sensor was attached to the patient phantom in real space, and the twist of the phantom was linked to the patient in the virtual space. Training was conducted for 24 students, and their operation records were analyzed and evaluated. The training's efficacy was also evaluated through questionnaires provided at the end of the training. The total time required for patient setup tests before and after training decreased significantly from 331.9 s to 146.2 s. As a result of the questionnaire regarding the usability of training to the trainee, most were highly evaluated. We found that training significantly improved students' understanding of the patient setup. With the proposed system, trainees can experience a simulated setup that can aid in deepening their understanding of radiation therapy treatments.

    DOI： 10.3390/jimaging10080184

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  • Photon and Neutron Dose Estimation Using Monte Carlo Simulation in TrueBeam's Room

    Quoc, SD; Fujibuchi, T; Arakawa, H; Hamada, K

    JOURNAL OF MEDICAL PHYSICS   49 ( 3 )   473 - 479   2024.7   （ ISSN:0971-6203 eISSN:1998-3913 ）

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    Language：English   Publisher：Journal of Medical Physics  

    Purpose: The distribution of neutron ambient dose equivalent within the TrueBeam 10 MV photon chamber was investigated. Materials and Methods: The research used particle and heavy ion transport code system (PHITS) code and JENDL-5.0 to simulate the neutron ambient dose equivalent on and around TrueBeam’s head. The simulated results were compared with the measured results using CR-39 detectors when TrueBeam radiated 5000 monitor units of 10 MV photons with field sizes 20 cm × 20 cm and 0.5 cm × 0.5 cm. Results: Out of field size, the neutron ambient dose equivalents of the 0.5 cm × 0.5 cm field size are higher than those values of the 20 cm × 20 cm field size from 4% to 30%. The differences between the simulated value and the measured value of the neutron ambient dose equivalents at all points out of field size are smaller than 20%. Conclusion: The neutron ambient dose equivalents, simulated with PHITS and JENDL-5.0, are satisfied with the measured neutron ambient dose equivalent.

    DOI： 10.4103/jmp.jmp_70_24

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  • Simulating the head of a TrueBeam linear particle accelerator and calculating the photoneutron spectrum on the central axis of a 10-MV photon using particle and heavy-ion transport system code. International journal

    Soai Dang Quoc, Toshioh Fujibuchi, Hiroyuki Arakawa, Keisuke Hamada

    Radiation protection dosimetry   200 ( 8 )   779 - 790   2024.5   （ ISSN:0144-8420 eISSN:1742-3406 ）

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    Photon energy is higher than the (γ,n) threshold, allowing it to interact with the nuclei of materials with high z properties and liberate fast neutrons. This represents a potentially harmful source of radiation for humans and the environment. This study validated the Monte Carlo simulation, using the particle and heavy-ion transport code system (PHITS) on a TrueBeam 10-MV linear particle accelerator's head shielding model and then used this PHITS code to simulate a photo-neutron spectrum for the transport of the beam. The results showed that, when comparing the simulated to measured PDD and crosslines, 100% of the γ-indexes were <1 (γ3%/3mm) for both simulations, for both phase-space data source and a mono energy source. Neutron spectra were recorded in all parts of the TrueBeam's head, as well as photon neutron spectra at three points on the beamline.

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  • Directional vector visualization of scattered rays in mobile c-arm fluoroscopy(タイトル和訳中)

    Hizukuri Kyoko, Fujibuchi Toshioh, Arakawa Hiroyuki

    Radiological Physics and Technology   17 ( 1 )   288 - 296   2024.3   （ ISSN:1865-0333 ）

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    Language：English   Publisher：(公社)日本放射線技術学会  

    本報ではparticle and heavy-ion transport code system(PHITS)を用いたモンテカルロシミュレーションによりCアームX線蛍光透視法システムを再現することで、X線室内の散乱線挙動の再現を試みた。また、散乱線挙動の算出結果を用いて、ファントムから散乱したフォトンのベクトルを三次元的に可視化した。なお、医師のモデルは方向ベクトルおよび線量分布マップ上に配置し、防護版を置いた際、医師に放射される散乱線の方向を確認し、シミュレーションの正確度は周辺線量当量を測定し、測定値と計算値を比較することで確認した。その結果、散乱線の方向ベクトルはファントムから外側に放射され、大量の後方散乱放射が確認され、患者と医師の頭部間に防護板を利用すると遮蔽効果が高まり、防護板を使用しない場合と比べ医師に対する放射線防護が強化された。以上より、方向ベクトルおよび周辺線量当量分布を確認することにより、放射線防護板の適切な使用が促進されると考えられた。

  • Directional vector visualization of scattered rays in mobile c-arm fluoroscopy.

    Kyoko Hizukuri, Toshioh Fujibuchi, Hiroyuki Arakawa

    Radiological physics and technology   17 ( 1 )   288 - 296   2024.3   （ ISSN:1865-0333 eISSN:1865-0341 ）

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    Previous radiation protection-measure studies for medical staff who perform X-ray fluoroscopy have employed simulations to investigate the use of protective plates and their shielding effectiveness. Incorporating directional information enables users to gain a clearer understanding of how to position protective plates effectively. Therefore, in this study, we propose the visualization of the directional vectors of scattered rays. X-ray fluoroscopy was performed; the particle and heavy-ion transport code system was used in Monte Carlo simulations to reproduce the behavior of scattered rays in an X-ray room by reproducing a C-arm X-ray fluoroscopy system. Using the calculated results of the scattered-ray behavior, the vectors of photons scattered from the phantom were visualized in three dimensions. A model of the physician was placed on the directional vectors and dose distribution maps to confirm the direction of the scattered rays toward the physician when the protective plate was in place. Simulation accuracy was confirmed by measuring the ambient dose equivalent and comparing the measured and calculated values (agreed within 10%). The directional vectors of the scattered rays radiated outward from the phantom, confirming a large amount of backscatter radiation. The use of a protective plate between the patient and the physician's head part increased the shielding effect, thereby enhancing radiation protection for the physicians compared to cases without the protective plate. The use of directional vectors and the surrounding dose-equivalent distribution of this method can elucidate the appropriate use of radiation protection plates.

    DOI： 10.1007/s12194-024-00779-w

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  • Radiation-training system with a custom survey-meter mock-up in a browser-based mixed reality environment

    Hiroyuki Arakawa, Toshioh Fujibuchi, Kosuke Kaneko, Yoshihiro Okada, Toshiko Tomisawa

    Nuclear Engineering and Technology   56 ( 6 )   2428 - 2435   2024.2   （ ISSN:1738-5733 ）

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    DOI： 10.1016/j.net.2024.01.057

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  • Investigation of patient release examination training in nuclear medicine using mixed reality

    Arakawa Hiroyuki, Fujibuchi Toshioh, Okada Yoshihiro, Kaneko Kosuke, Tomisawa Toshiko

    Journal of Advanced Simulation in Science and Engineering   11 ( 1 )   125 - 135   2024   （ eISSN:21885303 ）

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    Language：English   Publisher：Japan Society for Simulation Technology  

    <p>In nuclear medicine, assessing residual radioactivity before patient release is essential. It is typically assessed by radiation detection with a survey meter. This protocol inadvertently exposes to radiation and requires proficiency in the use of the survey meter. This study developed a mixed reality system designed to provide exposure-free training during patient release examination. This system involves a virtual radiation source with visualized radiation emission on the corresponding part of the human mannequin. The time response characteristics of the survey meter to changes with the time constant in addition to the source distance were simulated in realtime.</p>

    DOI： 10.15748/jasse.11.125

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  • Investigation of patient release examination training in nuclear medicine using mixed reality

    Arakawa, H; Fujibuchi, T; Okada, Y; Kaneko, K; Tomisawa, T

    JOURNAL OF ADVANCED SIMULATION IN SCIENCE AND ENGINEERING   11 ( 1 )   125 - 135   2024   （ ISSN:2188-5303 ）

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  • Evaluation of Transmitted X-ray Spectrum, Lead Equivalent, and Uniformity of Radiation Protective Clothing Made of Lead-containing and Lead-free Materials

    Yano Yuji, Fujibuchi Toshioh, Arakawa Hiroyuki

    Japanese Journal of Radiological Technology   80 ( 9 )   944 - 954   2024   （ ISSN:03694305 eISSN:18814883 ）

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Radiological Technology  

    <p> <i>Purpose</i>: The purpose of this study was to evaluate the protective performance of several new radiation-protective clothing and to clarify issues of quality control. <i>Methods</i>: The composition of the shielding elements was analyzed using X-ray fluorescence analysis, and the energy spectrum of transmitted X-rays was measured. Furthermore, the lead equivalent and uniformity were measured from the transmitted X-ray doses according to Japanese industrial standards (JIS). Uniformity was evaluated by transmitting X-ray images of each radiation protective clothing in addition to the conventional method. <i>Results</i>: The energy spectrum showed K-absorption edges of lead, bismuth, tin, etc., which were detected in the composition analysis. The multi-layered protective material maintained higher shielding ability at high tube voltages. In addition, X-ray images of the radiation-protective clothing showed uneven density and dots, and the differences in uniformity measurement methods and points that didn’t meet the required shielding capacity were seen. <i>Conclusion</i>: The current JIS does not allow accurate evaluation of the lead equivalent and uniformity, so visual evaluation of X-ray images is important. It is necessary to establish standardized standards for quality control performed by each facility.</p>

    DOI： 10.6009/jjrt.2024-1473

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  • Web-Based Interactive Radiation Visualization Tool for Radiation Protection Learning

    Oka, K; Fujibuchi, T; Arakawa, H; Kaneko, K; Shi, W; Okada, Y

    COMPLEX, INTELLIGENT AND SOFTWARE INTENSIVE SYSTEMS, CISIS-2024   87   499 - 512   2024   （ ISSN:2367-4512 ISBN:978-3-031-70010-1 ）

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    Publisher：Lecture Notes on Data Engineering and Communications Technologies  

    This paper proposes a web-based radiation visualization tool for radiation protection learning. During the radiation therapy, a medical doctor and his/her assistants besides a patient are faced with the radiation exposure. To protect the radiation exposure, medial students have to learn the protection methods against the radiation exposure. Several simulation codes have already been developed for understanding the radiation dose distribution. There is a research to visualize the simulation results using ParaView tool. Although its educational efficiency was confirmed, too many functions of ParaView require users much time to learn its operations, and preparations such as installation of ParaView are also burdensome for users. Therefore, the authors developed and evaluated a web-based interactive radiation visualization tool that allows users to prepare the learning environment simply and interactively reflecting the effects of protective equipment in addition to visualizing radiation dose distribution.

    DOI： 10.1007/978-3-031-70011-8_47

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  • Estimation of 2D profile dynamics of electrostatic potential fluctuations using multi-scale deep learning

    Yuki Jajima, Makoto Sasaki, Ryohtaroh T Ishikawa, Motoki Nakata, Tatsuya Kobayashi, Yuichi Kawachi, Hiroyuki Arakawa

    Plasma Physics and Controlled Fusion   65 ( 12 )   2023.12   （ ISSN:0741-3335 eISSN:1361-6587 ）

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    DOI： 10.1088/1361-6587/acff7f

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  • A novel approach to predict acute radiation dermatitis in patients with head and neck cancer using a model based on Bayesian probability International journal

    Keisuke Hamada, Toshioh Fujibuchi, Hiroyuki Arakawa, Yuichi Yokoyama, Naoki Yoshida, Hiroki Ohura, Naonobu Kunitake, Muneyuki Masuda, Takeo Honda, Satoru Tokuda, Makoto Sasaki

    Physica Medica   116   103181 - 103181   2023.12   （ ISSN:1120-1797 eISSN:1724-191X ）

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    Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    PURPOSE: In this study, we aimed to establish a method for predicting the probability of each acute radiation dermatitis (ARD) grade during the head and neck Volumetric Modulated Arc Therapy (VMAT) radiotherapy planning phase based on Bayesian probability. METHODS: The skin dose volume >50 Gy (V50), calculated using the treatment planning system, was used as a factor related to skin toxicity. The empirical distribution of each ARD grade relative to V50 was obtained from the ARD grades of 119 patients (55, 50, and 14 patients with G1, G2, and G3, respectively) determined by head and neck cancer specialists. Using Bayes' theorem, the Bayesian probabilities of G1, G2, and G3 for each value of V50 were calculated with an empirical distribution. Conversely, V50 was obtained based on the Bayesian probabilities of G1, G2, and G3. RESULTS: The empirical distribution for each graded patient group demonstrated a normal distribution. The method predicted ARD grades with 92.4 % accuracy and provided a V50 value for each grade. For example, using the graph, we could predict that V50 should be ≤24.5 cm3 to achieve G1 with 70 % probability. CONCLUSIONS: The Bayesian probability-based ARD prediction method could predict the ARD grade at the treatment planning stage using limited patient diagnostic data that demonstrated a normal distribution. If the probability of an ARD grade is high, skin care can be initiated in advance. Furthermore, the V50 value during treatment planning can provide radiation oncologists with data for strategies to reduce ARD.

    DOI： 10.1016/j.ejmp.2023.103181

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  • Identification of trapping finer-scale fluctuations in a solitary vortex in linear magnetized plasma

    Hiroyuki Arakawa, Makoto Sasaki, Shigeru Inagaki, Maxime Lesur, Yusuke Kosuga, Tatsuya Kobayashi, Fumiyoshi Kin, Takuma Yamada, Yoshihiko Nagashima, Akihide Fujisawa, Kimitaka Itoh

    Plasma Physics and Controlled Fusion   65 ( 11 )   2023.11   （ ISSN:0741-3335 eISSN:1361-6587 ）

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    DOI： 10.1088/1361-6587/acfbb3

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  • Observation of Quasi-Periodic Two-Dimensional Velocity Fields in Plasma Using Tomographic Laser-Induced Fluorescence Spectroscopy

    ARAKAWA Hiroyuki, SASAKI Makoto, INAGAKI Shigeru, TERASAKA Kenichiro, KAWACHI Yuichi, KIN Fumiyoshi, YAMADA Takuma, NAGASHIMA Yoshihiko, FUJISAWA Akihide

    Plasma and Fusion Research   18 ( 0 )   1201086 - 1201086   2023.10   （ ISSN:1880-6821 eISSN:18806821 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Plasma Science and Nuclear Fusion Research  

    <p>Recently, a new method that applies vector tomography to laser-induced fluorescence has been introduced, enabling the measurement of quasi-periodic two-dimensional velocity field in plasma [H. Arakawa <i>et al.</i>, Plasma Fusion Res. <b>18</b>, 1401032 (2023)]. In this study, we experimentally demonstrated this method in a linear magnetized plasma and presented the initial measurement results. The observed two-dimensional velocity field allowed the evaluation of Reynolds force and its energy transfer.</p>

    DOI： 10.1585/pfr.18.1201086

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  • Nonlinear simulation of resistive drift waves in cylindrical magnetized plasmas in the presence of symmetry breaking particle source

    M. Sasaki, N. Kasuya, Y. Kawachi, T. Kobayashi, T. Nishizawa, H. Arakawa, T. Yamada, A. Fujisawa

    Physics of Plasmas   30 ( 8 )   2023.8   （ ISSN:1070-664X eISSN:1089-7674 ）

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    Language：Others   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

    Nonlinear fluid simulation of drift wave turbulence in the presence of symmetry breaking particle source is performed for the cylindrical magnetized plasmas. It is demonstrated that the symmetry breaking of the system directly affects the selection rule of structure formations, the streamers disappear, and the zonal flows are enhanced in the case with the symmetry breaking. The symmetry breaking is introduced in the flux-driven simulation by inducing the particle source whose amplitude depends on the azimuthal angle. The symmetry breaking mode is driven stationarily, and the nonlinear process of the drift waves is significantly modified. By scanning the amplitude of the symmetry breaking source, the structure formation processes are systematically investigated. In addition, the nonlinear forces of the turbulence show the relaxation of the density gradient and the drive of the perpendicular/parallel flows in a two-dimensional manner.

    DOI： 10.1063/5.0150748

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  • Analysis of Turbulence Driven Particle Transport in PANTA by Using Multi-Field Singular Value Decomposition

    KODAHARA Takumi, SASAKI Makoto, KAWACHI Yuichi, JAJIMA Yuki, KOBAYASHI Tatsuya, YAMADA Takuma, ARAKAWA Hiroyuki, FUJISAWA Akihide

    Plasma and Fusion Research   18 ( 0 )   1202036 - 1202036   2023.6   （ ISSN:1880-6821 eISSN:18806821 ）

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    <p>Multi-field singular value decompositions (SVDs) is applied to turbulence obtained in a cylindrical magnetized plasma, PANTA. This method enables us to obtain the spatial mode structures with common temporal evolution of different physical quantities, such as the fluctuations of density and flows. Turbulence driven particle transport is evaluated by the method. It is shown that only the coupling of the same mode drives the transport, which stems from the orthogonality of the SVD. Thanks to this characteristics, the number of degrees of freedom which plays roles for the transport dynamics could be significantly reduced.</p>

    DOI： 10.1585/pfr.18.1202036

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  • Dose estimation for cone-beam computed tomography in image-guided radiation therapy for pelvic cancer using adult mesh-type reference computational phantoms

    Ceyda Cumur, Toshioh Fujibuchi, Hiroyuki Arakawa, Keisuke Hamada

    RADIOLOGICAL PHYSICS AND TECHNOLOGY   16 ( 2 )   203 - 211   2023.6   （ ISSN:1865-0333 eISSN:1865-0341 ）

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    The use of cone-beam computed tomography (CBCT) is expanding owing to its installation in linear accelerators for radiation therapy, and the imaging dose induced by this system has become the center of attention. Here, the dose to patients caused by the CBCT imager was investigated. Organ doses and effective doses for male and female mesh-type reference computational phantoms (MRCPs) and pelvis CBCT mode, routinely used for pelvic irradiation, were estimated using the Particle and Heavy Ion Transport Code System. The simulation results were confirmed based on the point-dose measurements. The estimated organ doses for male MRCPs with/without raised arms and for female MRCPs with/without raised arms were 0.00286-35.6 mGy, 0.00286-35.1 mGy, 0.00933-39.5 mGy, and 0.00931-39.0 mGy, respectively. The anticipated effective doses for male MRCPs with/without raised arms and female MRCPs with/without raised arms irradiated by pelvis CBCT mode were 4.25 mSv, 4.16 mSv, 7.66 mSv, and 7.48 mSv, respectively. The results of this study will be useful for patients who undergo image-guided radiotherapy with CBCT. However, because this study only covered one type of cancer with one type of imager, and image quality was not considered, more studies should be conducted to estimate the radiation dose from imaging devices in radiation therapy.

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  • 成人用mesh-type reference computational phantomを用いた骨盤癌に対する画像誘導放射線治療におけるコーンビームCTの線量推定(Dose estimation for cone-beam computed tomography in image-guided radiation therapy for pelvic cancer using adult mesh-type reference computational phantoms)

    Cumur Ceyda, Fujibuchi Toshioh, Arakawa Hiroyuki, Hamada Keisuke

    Radiological Physics and Technology   16 ( 2 )   203 - 211   2023.6   （ ISSN:1865-0333 ）

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    コーンビームCT(CBCT)を線形加速器(LINAC)内にインストールすることにより放射線治療への使用が拡大していることから、CBCT撮像装置により生じる患者線量を調べた。骨盤照射にルーチンで用いられる男性用及び女性用mesh-type reference computational phantom(MRCP)と骨盤CBCTモードに対する臓器線量と実効線量を推定し、point-dose計測により確認した。男性用MRCPに対する推定臓器線量はraised armの有り無しで各々0.00286～35.6mGyと0.00286～35.1mGyであり、女性用MRCPに対する推定臓器線量はraised armの有り無しで各々0.00933～39.5mGyと0.00931～39.0mGyであった。骨盤CBCTモードで照射時の実効線量は、男性用MRCPに対してraised armの有り無しで各々4.25mSvと4.16mSvであり、女性用MRCPに対してraised armの有り無しで各々7.66mSvと7.48mSvであった。

  • Reynolds Force Evaluation of Quasi-Coherent Structure by Tomographic Laser-Induced Fluorescence Spectroscopy

    Hiroyuki Arakawa, Makoto Sasaki, Shigeru Inagaki, Akihide Fujisawa

    PLASMA AND FUSION RESEARCH   18 ( 0 )   1401032 - 1401032   2023.5   （ ISSN:1880-6821 eISSN:18806821 ）

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    <p>A new method of vector tomography by laser-induced fluorescence (LIF) spectroscopy is proposed for the evaluation of the velocity field of quasi-coherent structure in linear magnetized plasma. Here, the two-dimensional velocity field was reconstructed with measuring synchronization of azimuthal reference probes and line-integrated LIF. The laser installation condition is designed to move in a radial direction perpendicular to the laser path. We applied the proposed method to a quasi-coherent flow obtained from a direct numerical turbulence simulation and demonstrated that the Reynolds stress and its force can be evaluated if its flow structure is maintained.</p>

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  • A Proposal to Evaluate Electron Temperature and Electron Density Fluctuations Using Dual Wavelength Emission Intensity Tomography in a Linear Plasma

    Yoshihiko Nagashima, Akihide Fujisawa, Kotaro Yamasaki, Shigeru Inagaki, Chanho Moon, Fumiyoshi Kin, Yuichi Kawachi, Hiroyuki Arakawa, Takuma Yamada, Tatsuya Kobayashi, Naohiro Kasuya, Yusuke Kosuga, Makoto Sasaki, Takeshi Ido

    Journal of the Physical Society of Japan   92 ( 3 )   033501-1 - 033501-4   2023.3   （ ISSN:00319015 eISSN:13474073 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

    DOI： 10.7566/jpsj.92.033501

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  • Formation Process of a Solitary Vortex in a Zonal Flow - Drift-Wave Dynamics

    Hiroyuki Arakawa, Makoto Sasaki, Shigeru Inagaki, Maxime Lesur, Yusuke Kosuga, Tatsuya Kobayashi, Fumiyoshi Kin, Takuma Yamada, Yoshihiko Nagashima, Akihide Fujisawa, Kimitak Itoh

    PLASMA AND FUSION RESEARCH   17 ( 0 )   1301106 - 1301106   2022.11   （ ISSN:1880-6821 eISSN:18806821 ）

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    <p>A solitary vortex organization process in drift-wave type fluctuations interacting with the zonal flow was identified experimentally in a linear magnetized plasma. An azimuthal probe array was used to evaluate temporal changes in the amplitude and phase in the density fluctuations. Excitation/damping of the solitary vortex is synchronized with zonal perturbation, and the waveform of drift-wave type fluctuation and its harmonics also changes synchronously. The solitary vortex is formed primarily through the phase modulation of the fundamental drift-wave type fluctuation and its harmonics.</p>

    DOI： 10.1585/pfr.17.1301106

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  • Prediction of Turbulence Temporal Evolution in PANTA by Long-Short Term Memory Network Reviewed International journal

    Masaomi Aizawacaranza, Makoto Sasaki, Hiroki Minagawa, Yuuki Nakazawa, Yoshitatsu Liu, Yuki Jajima, Yuichi Kawachi, Hiroyuki Arakawa, Kazuyuki Hara

    Plasma and Fusion Research   17 ( 0 )   1201048 - 1   2022.4   （ ISSN:1880-6821 eISSN:18806821 ）

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    <p>Prediction of time evolution of multi-scale turbulence is performed by using Long-short term memory networks. The time series data is obtained by Langmuir probes in a linear magnetized plasma device, PANTA. The simultaneous prediction of high and low frequency components of turbulence is shown to be possible within several tens percent accuracy. The prediction accuracy depends on the initial network, which can be controlled by reducing the learning rate.</p>

    DOI： 10.1585/PFR.17.1201048

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  • 医療施設におけるさまざまなX線撮影室条件での散乱線分布可視化と表示ツール開発 Reviewed

    清水 翔太, 荒川 弘之, 本田 城二, 徳森 謙二, 藤淵 俊王

    保健物理   56 ( 4 )   315 - 323   2021.12

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    DOI： 10.5453/jhps.56.315

  • Bayesian inference of ion velocity distribution function from laser-induced fluorescence spectra

    S. Tokuda, Y. Kawachi, M. Sasaki, H. Arakawa, K. Yamasaki, K. Terasaka, S. Inagaki

    Scientific Reports   11 ( 1 )   2021.12

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    DOI： 10.1038/s41598-021-00138-4

  • Dynamic interaction between fluctuations with different origins in a linear magnetized plasma

    Y. Kawachi, S. Inagaki, M. Sasaki, Y. Kosuga, K. Yamasaki, T. Kobayashi, F. Kin, T. Yamada, H. Arakawa, Y. Nagashima, C. Moon, N. Kasuya, A. Fujisawa

    Physics of Plasmas   28 ( 11 )   112302 - 112302   2021.11

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    DOI： 10.1063/5.0065887

  • Formation of density corrugations due to zonal flow in wave-kinetic framework Reviewed International journal

    M. Sasaki, K. Itoh, B. F. McMillan, T. Kobayashi, H. Arakawa, J. Chowdhury

    Physics of Plasmas   28 ( 11 )   112304-1 - 112304-7   2021.11

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    DOI： 10.1063/5.0055777

  • Interactions of drift wave turbulence with streamer flows in wave-kinetic formalism

    M. Sasaki, H. Arakawa, T. Kobayashi, F. Kin, Y. Kawachi, T. Yamada, K. Itoh

    Physics of Plasmas   28 ( 10 )   2021.10

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    DOI： 10.1063/5.0059839

  • On the triad transfer analysis of plasma turbulence: symmetrization, coarse graining, and directional representation

    S Maeyama, M Sasaki, K Fujii, T Kobayashi, R O Dendy, Y Kawachi, H Arakawa, S Inagaki

    New Journal of Physics   23 ( 4 )   043049 - 043049   2021.4

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    DOI： 10.1088/1367-2630/abeffc

  • Evaluation of abrupt energy transfer among turbulent plasma structures using singular value decomposition

    M Sasaki, T Kobayashi, R O Dendy, Y Kawachi, H Arakawa, S Inagaki

    Plasma Physics and Controlled Fusion   63 ( 2 )   025004 - 025004   2021.2

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    DOI： 10.1088/1361-6587/abcb46

  • Comparison between Tomography and Langmuir Probe Data in PANTA Reviewed

    Yoshihiko Nagashima, Akihide Fujisawa, Kotaro Yamasaki, Shigeru Inagaki, Chanho Moon, Fumiyoshi Kin, Yuichi Kawachi, Hiroyuki Arakawa, Takuma Yamada, Tatsuya Kobayashi, Naohiro Kasuya, Yusuke Kosuga, Makoto Sasaki, Takeshi Ido

    Journal of the Physical Society of Japan   89 ( 9 )   093501 - 093501   2020.9

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    DOI： 10.7566/jpsj.89.093501

  • Observation of spatiotemporal structures of temperature fluctuations by using of a statistical phase detection method in a linear magnetized plasma

    Yuichi Kawachi, Shigeru Inagaki, Fumiyoshi Kin, Kotaro Yamasaki, Yusuke Kosuga, Makoto Sasaki, Yoshihiko Nagashima, Takuma Yamada, Hiroyuki Arakawa, Naohiro Kasuya, Chanho Moon, Kazunobu Hasamada, Akihide Fujisawa

    Plasma Physics and Controlled Fusion   62 ( 5 )   2020.5

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    DOI： 10.1088/1361-6587/ab8132

  • Using dynamical mode decomposition to extract the limit cycle dynamics of modulated turbulence in a plasma simulation Reviewed

    M Sasaki, Y Kawachi, R O Dendy, H Arakawa, N Kasuya, F Kin, K Yamasaki, S Inagaki

    Plasma Physics and Controlled Fusion   61 ( 11 )   112001 - 112001   2019.11

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    DOI： 10.1088/1361-6587/ab471b

  • Ion temperature measurement by laser‐induced fluorescence spectroscopy in panta Reviewed

    2019.10

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    DOI： 10.1002/tee.22962

  • Turbulence Simulation on Zonal Flow Formations in the Presence of Parallel Flows Reviewed

    Makoto SASAKI, Naohiro KASUYA, Yusuke KOSUGA, Tatsuya KOBAYASHI, Takuma YAMADA, Hiroyuki ARAKAWA, Shigeru INAGAKI, Kimitaka ITOH

    Plasma and Fusion Research   14   1401161 - 1401161   2019.10

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    DOI： 10.1585/pfr.14.1401161

  • Roles of solitary eddy and splash in drift wave–zonal flow system in a linear magnetized plasma Reviewed

    26 ( 5 )   052305 - 052305   2019.5

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    DOI： 10.1063/1.5094577

  • Observations of radially elongated particle flux induced by streamer in a linear magnetized plasma Reviewed

    F. Kin, A. Fujisawa, K. Itoh, Y. Kosuga, M. Sasaki, S. Inagaki, Y. Nagashima, T. Yamada, N. Kasuya, K. Yamasaki, K. Hasamada, B. Y. Zhang, Y. Kawachi, H. Arakawa, T. Kobayashi, S.-I. Itoh

    Physics of Plasmas   26 ( 4 )   042306 - 042306   2019.4

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    DOI： 10.1063/1.5093218

  • Structure formation in parallel ion flow and density profiles by cross-ferroic turbulent transport in linear magnetized plasma Reviewed

    T. Kobayashi, S. Inagaki, Y. Kosuga, M. Sasaki, Y. Nagashima, T. Yamada, H. Arakawa, N. Kasuya, A. Fujisawa, S. -I. Itoh, K. Itoh

    PHYSICS OF PLASMAS   23 ( 10 )   2016.10

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    DOI： 10.1063/1.4965915

  • Changes of Particle Flux during End-Plate Biasing Experiment in PANTA Reviewed

    Fumiyoshi Kin, Takuma Yamada, Shigeru Inagaki, Yoshihiko Nagashima, Hiroyuki Arakawa, Tatsuya Kobayashi, Yudai Miwa, Naohiro Kasuya, Makoto Sasaki, Yusuke Kosuga, Akihide Fujisawa, Kimitaka Itoh, Sanae-I. Itoh

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 9 )   2016.9

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    DOI： 10.7566/JPSJ.85.093501

  • CTにおける逐次近似画像再構成のアルゴリズムとコンピュータシミュレーション

    桂川 茂彦, 徳森 謙二, 荒川 弘之

    帝京大学福岡医療技術学部紀要   11   1 - 20   2016.3

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    CTの逐次近似画像再構成(IR)の一手法である事後確率最大化(MAP)推定法は解像特性をほぼ維持しながらノイズ特性を大幅に改善できるので、CT検査における新しい画像再構成法として注目されている。本研究では、MAP推定法のコンピュータアルゴリズムを独自に作成し、シミュレーションで得られたディジタルファントムのサイノグラムに適用することで、IR法による再構成画像をフィルタ補正逆投影(FBP)法と比較する。目的関数の最適化にガウス・ザイデル法を用いると、5回の反復計算で再構成画像はほとんど変化しなくなり反復計算は収束することが分かった。CT検査における標準的な照射線量においてノイズを関心領域内のCT値の標準偏差(SD)で評価すると、IR法による再構成画像のノイズはFBP法と比較して58.3&#37;減少した。さらに、照射線量を少なくするとFBP画像のノイズは急激に増大するが、IR画像のノイズは照射線量に関係なくほぼ一定値を示すことが示された。したがって、CT検査時の照射線量をかなり低下させても、線量を低下させないFBP画像と同じSDとなる画像をIR法で再構成できるため、患者被曝線量の大幅な低減が可能となることが示唆された。(著者抄録)

  • Development of CO2 laser interferometer/polarimeter system in JT-60SA Reviewed

    H. Sasao, Y. Kawano, H. Arakawa, T. Sakuma, R. Imazawa, H. Kubo, K. Itami

    JOURNAL OF INSTRUMENTATION   11   2016.2

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    DOI： 10.1088/1748-0221/11/02/C02082

  • Azimuthal inhomogeneity of turbulence structure and its impact on intermittent particle transport in linear magnetized plasmas Reviewed

    T. Kobayashi, S. Inagaki, M. Sasaki, Y. Kosuga, H. Arakawa, T. Yamada, Y. Nagashima, Y. Miwa, N. Kasuya, A. Fujisawa, S. -I. Itoh, K. Itoh

    PHYSICS OF PLASMAS   22 ( 11 )   2015.11

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    DOI： 10.1063/1.4934537

  • Observation of Parallel Force Balance for Drift Wave Fluctuation by a Fast Voltage Sweeping Method in a Linear Plasma Reviewed

    Yoshihiko Nagashima, Shigeru Inagaki, Akihide Fujisawa, Hiroyuki Arakawa, Takuma Yamada, Yudai Miwa, Tatsuya Kobayashi, Sanae-I. Itoh, Kimitaka Itoh

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 6 )   2015.6

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    DOI： 10.7566/JPSJ.84.063501

  • Formation mechanism of steep wave front in magnetized plasmas Reviewed

    M. Sasaki, N. Kasuya, T. Kobayashi, H. Arakawa, K. Itoh, K. Fukunaga, T. Yamada, M. Yagi, S. -I. Itoh

    PHYSICS OF PLASMAS   22 ( 3 )   2015.3

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    DOI： 10.1063/1.4916490

  • Note: Magnification of a polarization angle with a Littrow layout brazed grating Reviewed

    H. Sasao, H. Arakawa, H. Kubo, Y. Kawano, K. Itami

    REVIEW OF SCIENTIFIC INSTRUMENTS   85 ( 8 )   2014.8

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    DOI： 10.1063/1.4892478

  • A new method for determining the plasma electron density using optical frequency comb interferometer Reviewed

    Hiroyuki Arakawa, Hiroshi Tojo, Hajime Sasao, Yasunori Kawano, Kiyoshi Itami

    REVIEW OF SCIENTIFIC INSTRUMENTS   85 ( 4 )   2014.4

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    DOI： 10.1063/1.4870925

  • Identification of errors in the electron density measurements of a tangential interferometer/polarimeter system during a tokamak discharge Reviewed

    H. Arakawa, Y. Kawano, K. Itami

    REVIEW OF SCIENTIFIC INSTRUMENTS   83 ( 10 )   2012.10

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    DOI： 10.1063/1.4745223

  • Measurement of neutron-induced proton-production energy spectra with NE213 scintillator Reviewed

    Tsuyoshi Kajimoto, Nobuhiro Shigyo, Kenji Ishibashi, Hiroyuki Arakawa, Robert C. Haight, Nikolaos Fotiades

    RADIATION MEASUREMENTS   47 ( 8 )   596 - 608   2012.8

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    DOI： 10.1016/j.radmeas.2012.06.020

  • A new method for determining the plasma electron density using three-color interferometer Reviewed

    Hiroyuki Arakawa, Yasunori Kawano, Kiyoshi Itami

    REVIEW OF SCIENTIFIC INSTRUMENTS   83 ( 6 )   2012.6

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    DOI： 10.1063/1.4731651

  • Dynamics of particle flux in a cylindrical magnetized plasma Reviewed

    S. Oldenbuerger, S. Inagaki, T. Kobayashi, H. Arakawa, N. Ohyama, K. Kawashima, Y. Tobimatsu, A. Fujisawa, K. Itoh, S-I Itoh

    PLASMA PHYSICS AND CONTROLLED FUSION   54 ( 5 )   2012.5

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    DOI： 10.1088/0741-3335/54/5/055002

  • Dynamic interaction between a solitary drift wave structure and zonal flows in a linear cylindrical device Reviewed

    H. Arakawa, T. Kobayashi, S. Inagaki, N. Kasuya, S. Oldenbuerger, Y. Nagashima, T. Yamada, M. Yagi, A. Fujisawa, K. Itoh, S-I Itoh

    PLASMA PHYSICS AND CONTROLLED FUSION   53 ( 11 )   2011.11

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    DOI： 10.1088/0741-3335/53/11/115009

  • Observation of Long-Distance Radial Correlation in Toroidal Plasma Turbulence Reviewed

    S. Inagaki, T. Tokuzawa, K. Itoh, K. Ida, S. -I. Itoh, N. Tamura, S. Sakakibara, N. Kasuya, A. Fujisawa, S. Kubo, T. Shimozuma, T. Ido, S. Nishimura, H. Arakawa, T. Kobayashi, K. Tanaka, Y. Nagayama, K. Kawahata, S. Sudo, H. Yamada, A. Komori

    PHYSICAL REVIEW LETTERS   107 ( 11 )   2011.9

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    DOI： 10.1103/PhysRevLett.107.115001

  • Measurements of Neutron-induced Neutron-production Double-differential Cross Sections from 50 to 150 MeV Reviewed

    T. Kajimoto, N. Shigyo, K. Ishibashi, D. Moriguchi, Y. Nakamura, H. Arakawa, S. Kunieda, T. Watanabe, R. C. Haight

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   59 ( 2 )   1721 - 1724   2011.8

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    DOI： 10.3938/jkps.59.1721

  • Shielding Experiments under JASMIN Collaboration at Fermilab (I) Overview of the Research Activities Reviewed

    Y. Kasugai, N. Matsuda, Y. Iwamoto, Y. Sakamoto, H. Nakashima, H. Matsumura, N. Kinoshita, H. Iwase, T. Sanami, M. Hagiwara, H. Hirayama, H. Yashima, N. Sigyo, H. Arakawa, K. Ishibashi, N. Mokhov, A. Leveling, D. Boehnlein, K. Vaziri, G. Lauten, S. Wayne, V. Cupps, B. Kershisnik, S. Benesch, T. Nakamura, K. Oishi, K. Niita

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   59 ( 2 )   2063 - 2066   2011.8

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    DOI： 10.3938/jkps.59.2063

  • Non-Gaussian properties of global momentum and particle fluxes in a cylindrical laboratory plasma Reviewed

    Yoshihiko Nagashima, Sanae-I. Itoh, Shigeru Inagaki, Hiroyuki Arakawa, Naohiro Kasuya, Akihide Fujisawa, Kunihiro Kamataki, Takuma Yamada, Shunjiro Shinohara, Stella Oldenbuerger, Masatoshi Yagi, Yuichi Takase, Patrick H. Diamond, Kimitaka Itoh

    PHYSICS OF PLASMAS   18 ( 7 )   2011.7

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    DOI： 10.1063/1.3601767

  • Method for Estimating the Wavenumber of Standing Waves Using Three Langmuir Probes Reviewed

    Tatsuya Kobayashi, Yoshihiko Nagashima, Shigeru Inagaki, Hiroyuki Arakawa, Makoto Sasaki, Takuma Yamada, Masatoshi Yagi, Naohiro Kasuya, Akihide Fujisawa, Sanae-I. Itoh, Kimitaka Itoh

    Plasma and Fusion Research   6 ( 2011 )   2011.6

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    DOI： 10.1585/pfr.6.1401050

  • Development of radially movable multichannel Reynolds stress probe system for a cylindrical laboratory plasma Reviewed

    Yoshihiko Nagashima, Shigeru Inagaki, Kunihiro Kamakaki, Hiroyuki Arakawa, Takuma Yamada, Shunjiro Shinohara, Yoshinobu Kawai, Masatoshi Yagi, Akihide Fujisawa, Sanae-I Itoh, Kimitaka Itoh, Yuichi Takase

    REVIEW OF SCIENTIFIC INSTRUMENTS   82 ( 3 )   2011.3

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    DOI： 10.1063/1.3557384

  • Observation of Quasi-Two-Dimensional Nonlinear Interactions in a Drift-Wave Streamer Reviewed

    T. Yamada, S-I Itoh, S. Inagaki, Y. Nagashima, N. Kasuya, K. Kamataki, H. Arakawa, T. Kobayashi, M. Yagi, A. Fujisawa, K. Itoh

    PHYSICAL REVIEW LETTERS   105 ( 22 )   2010.11

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    DOI： 10.1103/PhysRevLett.105.225002

  • Bifurcation of the plasma turbulence on LMD-U Reviewed

    H. Arakawa, S. Inagaki, Y. Nagashima, T. Yamada, K. Kamataki, T. Kobayashi, S. Sugita, M. Yagi, N. Kasuya, A. Fujisawa, S-I Itoh, K. Itoh

    PLASMA PHYSICS AND CONTROLLED FUSION   52 ( 10 )   2010.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/0741-3335/52/10/105009

  • Study of Amplitude Correlation Technique in a Cylindrical Magnetized Plasma Reviewed

    Takuma Yamada, Sanae-I. Itoh, Shigeru Inagaki, Yoshihiko Nagashima, Kunihiro Kamataki, Hiroyuki Arakawa, Masatoshi Yagi, Akihide Fujisawa, Kimitaka Itoh

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 8 )   2010.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/JPSJ.79.085001

  • Two-dimensional bispectral analysis of drift wave turbulence in a cylindrical plasma Reviewed

    T. Yamada, S. -I. Itoh, S. Inagaki, Y. Nagashima, S. Shinohara, N. Kasuya, K. Terasaka, K. Kamataki, H. Arakawa, M. Yagi, A. Fujisawa, K. Itoh

    PHYSICS OF PLASMAS   17 ( 5 )   2010.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.3429674

  • 高エネルギー加速器施設における遮蔽と放射線照射効果に関する実験的研究 Reviewed

    中島 宏, 坂本 幸夫, 岩元 洋介, 松田 規宏, 春日井 好己, 中根 佳弘, 増川 史洋, Mokhov N., Leveling A., Boehnlein D., Vaziri K., 佐波 俊哉, 松村 宏, 萩原 雅之, 岩瀬 広, 木下 哲一, 平山 英夫, 大石 晃嗣, 中村 尚司, 荒川 弘之, 執行 信寛, 石橋 健二, 八島 浩, 中尾 徳晶, 仁井田 浩二

    168 ( 2 )   482 - 486   2009.11

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    Language：English   Publishing type：Research paper (other academic)  

    著者所属: 日本原子力研究開発機構(JAEA)

    DOI： 10.13182/NT09-A9229

  • Observations of abrupt changes in the fluctuation spectrum on LMD-U Reviewed

    H. Arakawa, K. Kamataki, S. Inagaki, T. Maruta, Y. Nagashima, T. Yamada, S. Shinohara, K. Terasaka, S. Sugita, M. Yagi, N. Kasuya, A. Fujisawa, S-I Itoh, K. Itoh

    PLASMA PHYSICS AND CONTROLLED FUSION   51 ( 8 )   2009.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/0741-3335/51/8/085001

  • Neutron-Production Double-Differential Cross Sections for 100 MeV Neutron-Incidence on In Reviewed

    Hiroyuki Arakawa, Tsuyoshi Kajimoto, Shusaku Noda, Takehito Watanabe, Nobuhiro Shigyo, Kenji Ishibashi, Satoshi Kunieda, Robert C. Haight

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   116 - 119   2008.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/00223131.2008.10875800

  • Study of Recoil-Proton-Detector System Using Organic and Inorganic Scintillators for High Energy Neutron Measurement Reviewed

    Tsuyoshi Kajimoto, Hiroyuki Arakawa, Shusaku Noda, Takehito Watanabe, Nobuhiro Shigyo, Kenji Ishibashi, Robert C. Haight

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   526 - 529   2008.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/00223131.2008.10875907

  • Performance of a phoswich detector composed of an inner NaI(T1) crystal and surrounding NE102A plastic scintillator for neutron spectrometry

    T. Watanabe, H. Arakawa, T. Kajimoto, Y. Iwamoto, D. Satoh, S. Kunieda, S. Noda, N. Shigyo, K. Ishibashi, T. Nakamura, R. C. Haight

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   587 ( 1 )   20 - 28   2008.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.nima.2008.01.001

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Books

  • Web-Based Interactive Radiation Visualization Tool for Radiation Protection Learning

    Oka K., Fujibuchi T., Arakawa H., Kaneko K., Shi W., Okada Y.

    Lecture Notes on Data Engineering and Communications Technologies  2024    （ ISSN:23674512 ）

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    This paper proposes a web-based radiation visualization tool for radiation protection learning. During the radiation therapy, a medical doctor and his/her assistants besides a patient are faced with the radiation exposure. To protect the radiation exposure, medial students have to learn the protection methods against the radiation exposure. Several simulation codes have already been developed for understanding the radiation dose distribution. There is a research to visualize the simulation results using ParaView tool. Although its educational efficiency was confirmed, too many functions of ParaView require users much time to learn its operations, and preparations such as installation of ParaView are also burdensome for users. Therefore, the authors developed and evaluated a web-based interactive radiation visualization tool that allows users to prepare the learning environment simply and interactively reflecting the effects of protective equipment in addition to visualizing radiation dose distribution.

    DOI： 10.1007/978-3-031-70011-8_47

    Scopus

Presentations

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MISC

  • AR技術を利用した血管造影時の散乱線の可視化による放射線防護教材の作成

    野口昂生, 藤淵俊王, 荒川弘之

    日本放射線技術学会総会学術大会予稿集   80th   2024   （ ISSN:1884-7846 ）

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  • 方向ベクトルを利用した放射線防護板配置時の簡易線量分布計算法の検討

    檜作響子, 藤淵俊王, 荒川弘之

    日本放射線技術学会総会学術大会予稿集   80th   2024   （ ISSN:1884-7846 ）

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  • 放射線防護板の位置に応じたリアルタイム散乱線分布表示アプリケーションの開発

    藤淵俊王, 荒川弘之

    日本放射線技術学会総会学術大会予稿集   80th   2024   （ ISSN:1884-7846 ）

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  • Turbulence analysis of linear plasma using multi-channel measurement

    山田琢磨, 菊田航介, 荒川弘之, 佐々木真, 西澤敬之, MOON C., 永島芳彦, 小菅佑輔, 糟谷直宏, 藤澤彰英

    日本物理学会講演概要集(CD-ROM)   79 ( 1 )   2024   （ ISSN:2189-079X ）

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  • 半導体カメラによるX線透視での散乱線源のリアルタイムイメージングの検討

    境真由, 李孝眞, 藤淵俊王, 荒川弘之

    日本放射線技術学会総会学術大会予稿集   80th   2024   （ ISSN:1884-7846 ）

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  • Extended realtyによるX線透視における放射線防護の最適化の理解た目的とした教育シナリオの作成と実践

    藤淵俊王, 荒川弘之

    日本放射線技術学会総会学術大会予稿集   80th   2024   （ ISSN:1884-7846 ）

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  • Angular Beam Modulationを使用したCT透視の線量評価のためのモンテカルロシミュレーションモデルの作成

    塩澤倫太郎, 中島寛人, 木村勇輝, 荒川弘之, 宮原善徳

    中四国放射線医療技術フォーラムプログラム抄録集   19th   2023   （ ISSN:2189-4647 ）

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  • 頭頚部VMATにおけるベイズ推定による放射線皮膚炎グレードの予測モデルと皮膚線量分布の可視化

    濱田圭介, 濱田圭介, 藤淵俊王, 荒川弘之, 横山雄一, 加賀惠太, 吉田直樹, 本多武夫

    日本放射線技術学会総会学術大会予稿集   79th   2023   （ ISSN:1884-7846 ）

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  • Analysis of dynamical turbulence phenomena using multi field SVD

    古田原拓実, 佐々木真, 河内裕一, 麝嶋祐樹, 小林達哉, 山田琢磨, 山田琢磨, 荒川弘之, 藤澤彰英, 藤澤彰英

    日本物理学会講演概要集(CD-ROM)   78 ( 2 )   2023   （ ISSN:2189-079X ）

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  • 術者の被ばく線量軽減に向けた透視画面目視とX線照射タイミングの同期検知ツールの開発

    荒川弘之, 藤淵俊王

    日本放射線技術学会雑誌   79 ( 9 )   2023   （ ISSN:0369-4305 ）

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  • 特異値分解とベクトルトモグラフィーを適用したプラズマ乱流パターン観測法の開発

    荒川弘之, 荒川弘之

    島津科学技術振興財団研究成果報告書   2020   2023   （ ISSN:1340-2951 ）

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  • Spatial structure estimation of electrostatic potential fluctuations in heterogeneous turbulent mixtures using deep learning

    麝嶋祐樹, 佐々木真, 石川遼太郎, 仲田資季, 仲田資季, 小林達哉, 河内裕一, 荒川弘之

    日本物理学会講演概要集(CD-ROM)   78 ( 2 )   2023   （ ISSN:2189-079X ）

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  • 放射線診療従事者の被ばく低減対策用リアルタイム被ばく推定ARアプリの開発

    藤淵俊王, 荒川弘之

    日本放射線技術学会雑誌   79 ( 9 )   2023   （ ISSN:0369-4305 ）

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  • Analysis of limit cycle phenomena in Kelvin-Helmholtz turbulence using by multi-field SVD

    古田原拓実, 佐々木真, 河内裕一, 麝嶋祐樹, 小林達哉, 小林達哉, 小菅佑輔, 小菅佑輔, 彌冨豪, 仲田資季, 仲田資季, 仲田資季, 山田琢磨, 山田琢磨, 荒川弘之, 藤澤彰英, 藤澤彰英

    プラズマ・核融合学会年会(Web)   40th   2023

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  • 医療用CT・MRI技術を応用したプラズマ乱流計測

    荒川弘之

    九州大学応用力学研究所全国共同利用研究成果報告(Web)   26   2023

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  • Development of a Method for Estimating Turbulent Flow Structure Near Wind Turbines Using a Drone

    坂口雄大, 佐々木真, 荒川弘之, 杉田暁, 山田琢磨

    日本大学生産工学部学術講演会講演概要(CD-ROM)   56th   2023   （ ISSN:2186-5647 ）

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  • X線透視における散乱線の飛跡の可視化による適切な防護板の配置方法の検討

    檜作響子, 藤淵俊王, 荒川弘之

    日本放射線技術学会総会学術大会予稿集   79th   2023   （ ISSN:1884-7846 ）

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  • Mixed Realityによる放射線可視化と計測模擬

    荒川弘之, 藤淵俊王, 岡田義広, 金子晃介, 冨澤登志子

    日本放射線技術学会総会学術大会予稿集   79th   2023   （ ISSN:1884-7846 ）

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  • Bayesian model selection of ion velocity distribution function in magnetized plasmas

    徳田悟, 河内裕一, 佐々木真, 荒川弘之, 山崎広太郎, 寺坂健一郎, 稲垣滋

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022   （ ISSN:2189-079X ）

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  • Estimation of normalized electron temperature and electron density fluctuations using emission signal tomography

    永島芳彦, 永島芳彦, 藤澤彰英, 藤澤彰英, 山崎広太郎, 稲垣滋, MOON C., MOON C., 金史良, 河内裕一, 荒川弘之, 山田琢磨, 山田琢磨, 小林達哉, 糟谷直宏, 糟谷直宏, 小菅佑輔, 小菅佑輔, 佐々木真, 井戸毅

    日本物理学会講演概要集(CD-ROM)   77 ( 2 )   2022   （ ISSN:2189-079X ）

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  • Formation of density staircase due to zonal flows

    佐々木真, 伊藤公孝, 伊藤公孝, MCMILLAN B. F., 小林達哉, 荒川弘之, CHOWDHURY J.

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022   （ ISSN:2189-079X ）

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  • Normalized Electron Temperature and Density Fluctuations measured with Two-wavelength Emission Intensity Tomography

    永島芳彦, 永島芳彦, 藤澤彰英, 藤澤彰英, 山崎広太郎, 稲垣滋, MOON Changho, MOON Changho, 金史良, 河内裕一, 荒川弘之, 山田琢磨, 山田琢磨, 小林達哉, 糟谷直宏, 糟谷直宏, 小菅佑輔, 小菅佑輔, 佐々木真, 井戸毅

    プラズマ・核融合学会年会(Web)   39th   2022

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  • アダマール変換光学系による空間分布計測

    荒川 弘之

    2016.12

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    Language：Japanese  

  • 直線磁化プラズマ乱流シミュレーションによるドリフト波と軸方向流れ駆動不安定性の競合

    佐々木真, 佐々木真, 糟谷直宏, 糟谷直宏, 登田慎一郎, 小菅佑輔, 小菅佑輔, 小林達哉, 荒川弘之, 山田琢磨, 山田琢磨, 稲垣滋, 稲垣滋, 矢木雅敏, 矢木雅敏, 伊藤公孝, 伊藤公孝, 伊藤早苗, 伊藤早苗

    日本物理学会講演概要集(CD-ROM)   2016.9

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    Language：Japanese  

    <p>直線プラズマ実験において、ドリフト波と軸方向流れシアによる不安定性の競合が観測され、粒子束・運動量束間の干渉に対する理解が進展している。この現象の模擬を目指し、シミュレーションコードの開発を行った。シミュレーションでは、軸方向運動量ソースを与え、軸方向流れを模擬する。その上で、軸方向流れシアによる不安定性の時空間構造の抽出を行う。</p>

    DOI： 10.11316/jpsgaiyo.71.2.0_674

  • 空間積分データを用いた条件付き仕分けによる乱流実験解析

    永島芳彦, 伊藤早苗, 稲垣滋, 鎌滝晋礼, 荒川弘之, 糟谷直宏, 矢木雅敏, 藤澤彰英, 伊藤公孝

    日本物理学会講演概要集   2014.3

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    Language：Japanese  

  • PANTAにおける揺動の3次元分布計測

    小林達哉, 稲垣滋, 永島芳彦, 山下哲生, 山田宗太郎, 大坪聡, 柿川伸介, 田北正智, 満薗友宏, 三輪祐大, 藤野博充, OLDENBUERGER Stella, 荒川弘之, 佐々木真, 山田琢磨, 杉田暁, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤早苗, 伊藤公孝

    日本物理学会講演概要集   2012.8

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  • 21aFA-1 PANTAにおける揺動の3次元分布計測(21aFA プラズマ基礎(乱流,輸送,多階層結合,粒子加速),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

    小林 達哉, 稲垣 滋, 永島 芳彦, 山下 哲生, 山田 宗太郎, 大坪 聡, 柿川 伸介, 田北 正智, 満薗 友宏, 三輪 祐大, 藤野 博充, Oldenburger Stella, 荒川 弘之, 佐々木 真, 山田 琢磨, 杉田 暁, 矢木 雅敏, 糟谷 直宏, 藤澤 彰英, 伊藤 早苗, 伊藤 公孝

    日本物理学会講演概要集   2012.8

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  • 乱流素過程の詳細計測について

    永島 芳彦, 荒川 弘之

    2012.6

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  • PANTAにおけるエンドプレートバイアス実験の乱流スペクトル解析

    小林達哉, 稲垣滋, 永島芳彦, OLDENBUERGER Stella, 川島勝之, 大山乃里子, 飛松祐紀, 山下哲生, 山田宗太郎, 荒川弘之, 佐々木真, 山田琢磨, 糟谷直宏, 矢木雅敏, 藤澤彰英, 伊藤早苗, 伊藤公孝

    日本物理学会講演概要集   2012.3

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  • 25pYG-13 3色干渉計によるエラー耐性のあるプラズマ電子密度計測法(25pYG 核融合プラズマ(輸送・閉じ込め特性(1)・分光・計測),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理)

    荒川 弘之, 河野 康則, 伊丹 潔

    日本物理学会講演概要集   2012.3

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  • PANTAにおけるエンドプレートバイアスの乱流運動量束に対する効果

    永島芳彦, 伊藤早苗, 稲垣滋, OLDENBUERGER S, 小林達哉, 大山乃里子, 川島勝之, 飛松祐紀, 山下哲生, 山田宗太郎, 糟谷直宏, 佐々木真, 矢木雅敏, 山田琢磨, 荒川弘之, 藤澤彰英, 伊藤公孝

    日本物理学会講演概要集   2012.3

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  • PANTAにおけるエンドプレートバイアスによる外部径電場制御

    稲垣滋, 永島芳彦, OLDENBUERGER Stella, 小林達哉, 川島勝之, 大山乃里子, 飛松祐紀, 山下哲生, 山田宗太郎, 糟谷直宏, 佐々木真, 山田琢磨, 荒川弘之, 矢木雅敏, 藤澤彰英, 伊藤早苗, 伊藤公孝

    日本物理学会講演概要集   2012.3

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  • PANTA装置におけるプラズマ乱流研究の現状

    稲垣滋, 荒川弘之, OLDENBUERGER Stella, 小林達哉, 瓜生和哉, 川島勝之, 永島芳彦, 山田琢磨, 矢木雅敏, 糟谷直弘, 佐々木真, 藤澤彰英, 伊藤早苗, 伊藤公孝

    日本物理学会講演概要集   2011.3

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  • PANTAにおけるトリプルプローブ法による電子温度揺動計測

    川島勝之, 稲垣滋, OLDENBUERGER Stella, 荒川弘之, 小林達哉, 瓜生和哉, 大山乃里子, 飛松祐紀, 永島芳彦, 山田琢磨, 矢木雅敏, 糟谷直宏, 佐々木真, 藤澤彰英, 伊藤早苗, 伊藤公孝

    日本物理学会講演概要集   2011.3

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  • LMD‐Uにおける孤立波の非線形発展

    荒川弘之, 稲垣滋, 永島芳彦, 山田琢磨, 小林達哉, OLDENBUERGER Stella, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2011.3

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    Language：Japanese  

  • 25pGZ-6 LMD-Uにおける孤立波の非線形発展(25pGZ プラズマ基礎(乱流・非線形現象・非中性プラズマ),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

    荒川 弘之, 稲垣 滋, 永島 芳彦, 山田 琢磨, 小林 達哉, Oldenburger Stella, 矢木 雅敏, 糟谷 直宏, 藤澤 彰英, 伊藤 公孝, 伊藤 早苗

    日本物理学会講演概要集   2011.3

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    Language：Japanese  

  • LMD‐Uにおけるスペクトル遷移領域の揺動の非線形結合度の観測

    小林達哉, 稲垣滋, 荒川弘之, OLDENBUERGER Stella, 佐々木真, 永島芳彦, 山田琢磨, 杉田暁, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2011.3

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    Language：Japanese  

  • LMD‐Uにおける揺動の非線形結合の磁場強度依存性

    小林達哉, 稲垣滋, 荒川弘之, 鎌滝晋礼, 佐々木真, 永島芳彦, 山田琢磨, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2010.8

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  • LMD‐Uにおけるスペクトル遷移における揺動駆動粒子束の統計的性質

    稲垣滋, 荒川弘之, 小林達哉, 永島芳彦, 山田琢磨, 矢木雅敏, 糟谷直宏, 藤澤彰英, 佐々木真, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2010.8

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  • LMD‐Uにおける揺動駆動輸送の統計的性質

    稲垣滋, 下田雅人, 荒川弘之, 鎌滝晋礼, 永島芳彦, 山田琢磨, 藤澤彰英, 糟谷直宏, 矢木雅敏, 伊藤公幸, 伊藤早苗

    日本物理学会講演概要集   2010.3

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  • 23pTJ-2 LMD-Uにおける揺動位相速度遷移のダイナミクス(23pTJ プラズマ基礎(非線形現象・強結合系),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

    荒川 弘之, 稲垣 滋, 永島 芳彦, 山田 琢磨, 鎌滝 晋礼, 小林 達哉, 杉田 暁, 矢木 雅敏, 糟谷 直宏, 藤澤 彰英, 伊藤 公孝, 伊藤 早苗

    日本物理学会講演概要集   2010.3

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  • LDM‐Uにおける揺動位相速度遷移のダイナミクス

    荒川弘之, 稲垣滋, 永島芳彦, 山田琢磨, 鎌滝晋礼, 小林達哉, 杉田暁, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2010.3

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  • LMD‐Uにおける密度及びポテンシャル揺動の非線形結合の解析

    小林達哉, 稲垣滋, 荒川弘之, 鎌滝晋礼, 永島芳彦, 山田琢磨, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2010.3

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    Language：Japanese  

  • LMD‐Uにおけるプラズマ乱流の構造相図

    荒川弘之, 稲垣滋, 永島芳彦, 山田琢磨, 鎌滝晋礼, 杉田暁, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2009.8

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    Language：Japanese  

  • LMD‐Uにおけるスペクトル遷移ダイナミクスの観測

    荒川弘之, 鎌滝晋礼, 稲垣滋, 丸田貴, 永島芳彦, 山田琢磨, 篠原俊二郎, 寺坂健一郎, 杉田暁, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2009.3

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    Language：Japanese  

  • 27pSP-10 LMD-Uにおけるスペクトル遷移ダイナミクスの観測(27pSP プラズマ基礎(波動・加熱・不安定性・輸送・閉じ込め特性・非線形現象・プラズマ応用),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

    荒川 弘之, 鎌滝 晋礼, 稲垣 滋, 丸田 貴, 永島 芳彦, 山田 琢磨, 篠原 俊二郎, 寺坂 健一郎, 杉田 暁, 矢木 雅敏, 糟谷 直宏, 藤澤 彰英, 伊藤 公孝, 伊藤 早苗

    日本物理学会講演概要集   2009.3

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  • LMD‐Uにおけるアルゴンプラズマにおける乱流遷移の観測

    荒川弘之, 鎌滝晋礼, 稲垣滋, 丸田貴, 永島芳彦, 山田琢磨, 篠原俊二郎, 寺坂健一郎, 杉田暁, 矢木雅敏, 糟谷直宏, 藤澤彰英, 伊藤公孝, 伊藤早苗

    日本物理学会講演概要集   2008.8

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Professional Memberships

  • Japan Society of Medical Physics

    2021.10 - Present

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  • The Japan Society of Plasma Science and Nuclear Fusion Research

  • JAPAN HEALTH PHYSICS SOCIETY

  • JAPANESE SOCIETY OF RADIOLOGICAL TECHNOLOGY

  • THE PHYSICAL SOCIETY OF JAPAN

  • Japan Society of Medical Physics

  • THE PHYSICAL SOCIETY OF JAPAN

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  • JAPANESE SOCIETY OF RADIOLOGICAL TECHNOLOGY

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  • JAPAN HEALTH PHYSICS SOCIETY

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  • The Japan Society of Plasma Science and Nuclear Fusion Research

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Research Projects

  • Non-invasive, dynamic monitoring of high dose-rate brachytherapy radiation source using sensor fusion

    Grant number：24K10785  2024 - 2026

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship：Principal investigator  Grant type：Scientific research funding

    CiNii Research

  • 実践的な課題解決能力を持つ高度放射線防護人材育成プログラム

    2022.7 - 2026.3

  • 直線磁化プラズマにおける高次非線形構造形成による輸送ダイナミクスの解明

    Grant number：21K03508  2021 - 2023

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    荒川 弘之

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    Authorship：Principal investigator  Grant type：Scientific research funding

    プラズマ乱流輸送研究においては、これまで乱流と流れという２体系の相互作用が主に考えられており、孤立渦・飛沫といった高次非線形構造の影響は小さいとして、実験・理論共にほとんど考慮されていなかった。近年の申請者らの研究で３次・４次的に形成された構造観測により、高次非線形構造形成に伴い、輸送が大きく変化する乱流状態を発見した。本研究では、これを更に発展させ、様々な乱流条件において高次非線形構造の輸送を評価し、高次非線形構造による輸送ダイナミクスの系統的理解を目指す。

    CiNii Research

  • 直線磁化プラズマにおける乱流・流れ・孤立渦の3体系ダイナミクスの解明

    Grant number：17K14897  2017 - 2019

    科学研究費助成事業  若手研究(B)

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    Authorship：Principal investigator  Grant type：Scientific research funding

  • 磁化プラズマにおける微細構造及びその動的挙動の観測

    Grant number：15H02335  2015 - 2019

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    Authorship：Coinvestigator(s)  Grant type：Scientific research funding

Class subject

  • 基礎医療統計

    2024.6 - 2024.8   Summer quarter

  • 物理数学Ⅲ

    2024.6 - 2024.8   Summer quarter

  • 放射線技術科学入門Ⅰ

    2024.4 - 2024.9   First semester

  • 電気電子工学入門

    2024.4 - 2024.9   First semester

  • Quantum Radiation Science and Technology Ⅰ

    2024.4 - 2024.9   First semester

  • Fundamental Theory of Electromagnatic Wave

    2024.4 - 2024.9   First semester

  • Practice in Quantum Radiation Technology

    2024.4 - 2024.9   First semester

  • 量子線理工科学Ⅰ

    2024.4 - 2024.9   First semester

  • 基礎電磁波論

    2024.4 - 2024.9   First semester

  • 医用量子線理工学演習

    2024.4 - 2024.9   First semester

  • 放射線治療・核医学機器学

    2024.4 - 2024.9   First semester

  • 放射線機器学実験

    2024.4 - 2024.6   Spring quarter

  • 放射線技術科学入門Ⅱ

    2023.10 - 2024.3   Second semester

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