Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Takumi Onchi Last modified date:2018.12.20

Assistant Professor / Advanced Fusion Research Center / Research Institute for Applied Mechanics


Papers
1. K. Kuroda, R. Raman, Kazuaki Hanada, Makoto Hasegawa, Takumi Onchi, M. Ono, B. A. Nelson, T. R. Jarboe, M. Nagata, O. Mitarai, K. Nakamura, Hiroshi Idei, J. Rogers, S. Kawasaki, T. Nagata, A. Kuzmin, S. Kojima, C. Huang, O. Watanabe, A. Higashijima, Y. Takase, A. Fukuyama, S. Murakami, Initial results from solenoid-free plasma start-up using Transient CHI on QUEST, Plasma Physics and Controlled Fusion, 10.1088/1361-6587/aadcb7, 60, 11, 2018.09, Initial results from the recently implemented transient coaxial helicity injection (CHI) system on QUEST are reported. QUEST uses a new CHI electrode configuration in which the CHI insulator is not part of the vacuum boundary, making this configuration easier to implement in fusion reactors. Experimental results show that transient CHI startup in this alternate electrode configuration is indeed possible. Reliable gas breakdown was achieved, and toroidal currents up to 45 kA were generated..
2. Santanu Banerjee, H. Zushi, N. Nishino, Kazuaki Hanada, Hiroshi Idei, K. Nakamura, Makoto Hasegawa, akihide fujisawa, Yoshihiko Nagashima, K. Mishra, S. Tashima, Takumi Onchi, A. Kuzmin, K. Matsuoka, Effect of magnetic shear on edge turbulence in SOL-like open field line configuration in QUEST, Plasma Physics and Controlled Fusion, 10.1088/1361-6587/aacb69, 60, 8, 2018.06, Intensity fluctuations are investigated using the fast camera imaging technique in the slab annular plasma as a function of magnetic shear and connection length in the spherical tokamak QUEST. Note that here QUEST is operated as a simple magnetized torus with a tight aspect ratio. Slab annular plasmas feature open magnetic field lines and can mimic the tokamak edge-scrape off layer (SOL)-like plasma attributes reasonably well. Three magnetic shear regimes are realized using three poloidal magnetic field (PF) coil pairs. A whole range of connection lengths (∼∞ ≥ L c ≥ 5.5 m) is scanned by varying the PF strength for a given toroidal field for each magnetic shear regime. For the first time a systematic study of the effect of magnetic shear and field line pitch together on edge-SOL-like plasma fluctuations is being reported. Slab plasmas with intermediate magnetic shear are observed to be more susceptible to generate distinct blobs when L c is reduced by increasing the PF strength. A distinct coherent mode appears only at the lowest magnetic shear slab featuring a deep potential well. Such mode is not apparent at other magnetic shear cases even at the same L c. Finally, with a combination of PF coil pairs, both the features of intermediate and low magnetic shear slabs are shown to be realizable simultaneously. Significantly stronger blobs are observed with such combination of PF mirror ratios in the presence of a coherent mode. This study may provide better insight into the effect of magnetic configuration in the tokamak edge and SOL turbulence and can help in searching for better tools to control cross-field convective intermittent transport in tokamaks..
3. Makoto Hasegawa, Kazuo Nakamura, Kazuaki Hanada, Shoji Kawasaki, Arseniy Kuzmin, Hiroshi Idei, Kazutoshi Tokunaga, Yoshihiko Nagashima, Takumi Onchi, Kengoh Kuroda, Osamu Watanabe, Aki Higashijima, Takahiro Nagata, Modification of plasma control system and hot-wall temperature control system for long-duration plasma sustainment in QUEST, Fusion Engineering and Design, 10.1016/j.fusengdes.2018.02.069, 129, 202-206, 2018.04, In tokamaks, the temperature of the plasma-facing wall is an important parameter for achieving particle balance and therefore steady-state operation. QUEST, which is a middle-sized spherical tokamak, has hot walls that act as plasma-facing walls. They can be actively heated with sheath heaters and actively cooled with water. To control the wall temperature, heating and cooling systems have been developed. These systems adjust the power of the sheath heaters and the motor valves of the cooling system, respectively. The two systems communicate via Ethernet through UDP and control the hot-wall temperature cooperatively. The plasma control system (PCS) in QUEST has also been modified, especially with respect to gas fueling, in order to enable long-duration plasma sustainment. A feedback controller has been installed in the PCS, together with a mass flow controller, allowing Hα emission from the plasma which is used as a reference signal, to be well controlled. Plasma density calculations using a field-programmable gate array are proposed for the feedback control system..
4. C. Xiao, A. Rohollahi, Takumi Onchi, M. Dreval, S. Elgriw, A. Hirose, Momentum injection and repetitive CT operation experiments, Radiation Effects and Defects in Solids, 10.1080/10420150.2017.1398244, 172, 9-10, 713-717, 2017.10.
5. Kazuaki Hanada, N. Yoshida, T. Honda, Z. Wang, A. Kuzmin, I. Takagi, T. Hirata, Y. Oya, M. Miyamoto, H. Zushi, Makoto Hasegawa, K. Nakamura, akihide fujisawa, Hiroshi Idei, Yoshihiko Nagashima, O. Watanabe, Takumi Onchi, K. Kuroda, H. Long, Hideo Watanabe, Kazutoshi Tokunaga, A. Higashijima, S. Kawasaki, T. Nagata, Y. Takase, A. Fukuyama, O. Mitarai, Investigation of hydrogen recycling in long-duration discharges and its modification with a hot wall in the spherical tokamak QUEST, Nuclear Fusion, 10.1088/1741-4326/aa8121, 57, 12, 2017.10, Fully non-inductive plasma maintenance was achieved by a microwave of 8.2 GHz and 40 kW for more than 1 h 55 min with a well-controlled plasma-facing wall (PFW) temperature of 393 K, using a hot wall in the middle-sized spherical tokamak QUEST, until the discharge was finally terminated by the uncontrollability of the density. The PFW was composed of atmospheric plasma-sprayed tungsten and stainless steel. The hot wall plays an essential role in reducing the amount of wall-stored hydrogen and facilitates hydrogen recycling. The behaviour of fuel hydrogen in the PFW was investigated by monitoring the injection and evacuation of hydrogen into and from the plasma-producing vessel. A fuel particle balance equation based on the presence of a hydrogen transport barrier between the deposited layer and the substrate was applied to the long-duration discharges. It was found that the model could readily predict the observed behaviour in which a higher wall temperature likely gives rise to faster wall saturation..
6. Hiroshi Idei, T. Kariya, T. Imai, K. Mishra, Takumi Onchi, O. Watanabe, H. Zushi, Kazuaki Hanada, J. Qian, A. Ejiri, M. M. Alam, K. Nakamura, akihide fujisawa, Yoshihiko Nagashima, Makoto Hasegawa, K. Matsuoka, A. Fukuyama, S. Kubo, T. Shimozuma, M. Yoshikawa, M. Sakamoto, S. Kawasaki, H. Nakashima, A. Higashijima, S. Ide, T. Maekawa, Y. Takase, K. Toi, Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak, Nuclear Fusion, 10.1088/1741-4326/aa7c20, 57, 12, 2017.10, Fully non-inductive second (2nd) harmonic electron cyclotron (EC) plasma current ramp-up was demonstrated with a newlly developed 28 GHz system in the QUEST spherical tokamak. A high plasma current of 54 kA was non-inductively ramped up and sustained stably for 0.9 s with a 270 kW 28 GHz wave. A higher plasma current of 66 kA was also non-inductively achieved with a slow ramp-up of the vertical field. We have achieved a significantly higher plasma current than those achieved previously with the 2nd harmonic EC waves. This fully non-inductive 2nd harmonic EC plasma ramp-up method might be useful for future burning plasma devices and fusion reactors, in particular for operations at half magnetic field with the same EC heating equipment..
7. A. Kuzmin, H. Zushi, I. Takagi, S. K. Sharma, M. Kobayashi, Y. Hirooka, Takumi Onchi, Kazuaki Hanada, N. Yoshida, K. Nakamura, akihide fujisawa, Hiroshi Idei, Yoshihiko Nagashima, Makoto Hasegawa, T. Mutoh, K. Mishra, H. Ohwada, Spatial distribution of atomic and ion hydrogen flux and its effect on hydrogen recycling in long duration confined and non-confined plasmas, Nuclear Materials and Energy, 10.1016/j.nme.2017.03.027, 12, 627-632, 2017.08, In order to understand the atomic hydrogen distribution in different kinds of plasma and its influence on the recycling, two kinds of plasmas were used: non-confined annular electron cyclotron resonance (ECR) and confined long duration plasmas. The permeation probes are used to measure directly the atomic hydrogen flux at several poloidal positions. The permeation through metals due to the ion and atom component of the hydrogen flux to the wall is indistinguishable. To estimate the contribution of the ions directly, Langmuir probes were used. The Гinc profile behind the plasma facing components (PFCs) is almost constant, ∼2 ×1018 H/s/m2..
8. T. Onchi, A. Fujisawa, A. Sanpei, H. Himura, S. Masamune, and RELAX team, Permutation entropy and statistical complexity in characterising low-aspect-ratio reversed-field pinch plasma, Physica Scripta, https://doi.org/10.1088/1402-4896/aa6689, 92, 5, 055601, 2017.04.
9. T. Onchi, H. Zushi, K. Mishra, Y. Oyama, Y. Nagashima, K. Hanada, H. Idei, M. Hasegawa, A. Kuzmin, H. Miura, K. Nakamura, A. Fujisawa, K. Nagaoka, Response of the far scrape-off layer plasma to strong gas puffing in the high poloidal beta configuration of the QUEST spherical tokamak, PLASMA PHYSICS AND CONTROLLED FUSION, 10.1088/0741-3335/58/11/115004, 58, 11, 2016.11.
10. O. Mitarai, K. Nakamura, M. Hasegawa, T. Onchi, H. Idei, A. Fujisawa, K. Hanada, H. Zushi, A. Higashijima, H. Nakashima, S. Kawasaki, K. Matsuoka, S. Koike, T. Takahashi, H. Tsutsui, Comparative studies of inner and outer divertor discharges and a fueling study in QUEST, FUSION ENGINEERING AND DESIGN, 10.1016/j.fusengdes.2015.12.022, 109, 1365-1370, 2016.11.
11. S. Banerjee, H. Zushi, N. Nishino, K. Mishra, K. Mahira, S. Tashima, A. Ejiri, T. Yamaguchi, T. Onchi, Y. Nagashima, K. Hanada, K. Nakamura, H. Idei, M. Hasegawa, A. Fujisawa, A. Kuzmin, K. Matsuoka, Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high beta(p) plasma in QUEST, PHYSICS OF PLASMAS, 10.1063/1.4960117, 23, 8, 2016.08.
12. A Kuzmin, H Zushi, I Takagi, SK Sharma, Y Hirooka, M Kobayashi, M Sakamoto, K Hanada, T Onchi, Y Oyama, N Youshida, K Nakamura, A Fujisawa, H Idei, Y Nagashima, M Hasegawa, K Mishra, Hydrogen flux measurements with permeation probes in spherical tokamak QUEST, Vacuum, 129, 178, 2016.04.
13. H Idei, K Mishra, MK Yamamoto, M Hamasaki, A Fujisawa, Y Nagashima, Y Hayashi, T Onchi, K Hanada, H Zushi, Adaptive-array Electron Cyclotron Emission diagnostics using data streaming in a Software Defined Radio system, Journal of Instrumentation, 11, 4, C04010, 2016.04.
14. Takumi Onchi, D. McColl, A. Rohollahi, C. Xiao, A. Hirose, M. Dreval, S. Wolfe, Development Toward a Repetitive Compact Torus Injector, IEEE Transactions on Plasma Science, 44, 2, 195, 2016.02.
15. A Fujisawa, Y Nagashima, S Inagaki, T Onchi, S Ohshima, A Shimizu, Tomography as a promising diagnostic tool for plasma turbulence, Plasma Physics and Controlled Fusion, 58, 2, 025005, 2016.02.
16. H Idei, K Mishra, MK Yamamoto, A Fujisawa, Y Nagashima, M Hamasaki, Y Hayashi, T Onchi, K Hanada, H Zushi, Multiple wall-reflection effect in adaptive-array differential-phase reflectometry on QUEST, Journal of Instrumentation, 11, 1, C01014, 2016.01.
17. O Mitarai, K Nakamura, M Hasegawa, T Onchi, H Idei, A Fujisawa, K Hanada, H Zushi, A Higashijima, H Nakashima, S Kawasaki, K Matsuoka, S Koike, T Takahashi, H Tsutsui, Comparative studies of inner and outer divertor discharges and a fueling study in QUEST, Fusion Engineering and Design, 2015.12.
18. T. Onchi, H. Zushi, K. Mishra, Y. Mahira, K. Nagaoka, K. Hanada, H. Idei, M. Hasegawa, K. Nakamura, A. Fujisawa, Y. Nagashima, K. Matsuoka, S. Tashima, S. Banerjee, A. Kuzmin, S. Kawasaki, H. Nakashima, A. Higashijima, O. Watanabe, Heat flux and plasma flow in the far scrape-off layer of the inboard poloidal field null configuration in QUEST, Physics of Plasmas, 22, 8, 082513, 2015.08.
19. Kishore Mishra, H Zushi, H Idei, M Hasegawa, T Onchi, S Tashima, S Banerjee, H Hanada, H Togashi, T Yamaguchi, A Ejiri, Y Takase, K Nakamura, A Fujisawa, Y Nagashima, A Kuzmin, Self organization of high βp plasma equilibrium with an inboard poloidal magnetic field null in QUEST, Nuclear Fusion, 55, 8, 083009, 2015.08.
20. T. Onchi, Y. Mahira, K. Nagaoka, S. Tashima, S. Banerjee, K. Mishra, H. Idei, K. Hanada, K. Nakamura, A. Fujisawa, Y. Nagashima, M. Hasegawa, K. Matsuoka, A. Kuzmin, O. Watanabe, S. Kawasaki, H. Nakashima, A. Higashijima, Observation of heat flux and plasma flow in scrape off layer in QUEST, Journal of Nuclear Materials, 463, 428, 2015.08.
21. K. Hanada, H. Zushi, N. Yoshida, N. Yugami, T. Honda, M. Hasegawa, K. Mishra, A. Kuzmin, K. Nakamura, A. Fujisawa, H. Idei, Y. Nagashima, O. Watanabe, T. Onchi, H. Watanabe, K. Tokunaga, A. Higashijima, S. Kawasaki, H. Nakashima, Y. Takase, A. Fukuyama, O. Mitarai, Y.K.M. Peng, Particle balance in long duration RF driven plasmas on QUEST, Journal of Nuclear Materials, 463, 1084, 2015.08.
22. A. Kuzmin, H. Zushi, I. Takagi, S.K. Sharma, A. Rusinov, Y. Inoue, Y. Hirooka, H. Zhou, M. Kobayashi, M. Sakamoto, K. Hanada, N. Yoshida, K. Nakamura, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, M. Hasegawa, T. Onchi, S. Banerjee, K. Mishra, Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak, Journal of Nuclear Materials, 463, 1087, 2015.08.
23. S. Banerjee, H. Zushi, N. Nishino, K. Mishra, T. Onchi, A. Kuzmin, Y. Nagashima, K. Hanada, K. Nakamura, H. Idei, M. Hasegawa, A. Fujisawa, Dynamical programming based turbulence velocimetry for fast visible imaging of tokamak plasma, Review of Scientific Instruments, 86, 3, 033505, 2015.03.
24. T. Onchi, D. McColl, M. Dreval, S. Wolfe, C. Xiao, A. Hirose, Design and implementation of fast charging circuit for repetitive compact torus injector, Fusion Engineering and Design, 89, 11, 2559, 2014.11.
25. T. Onchi, A. Fujisawa, A. Sanpei, A prototype diagnostics system to detect ultraviolet emission for plasma turbulence, Review of Scientific Instruments, 85, 11, 113502, 2014.11.
26. K. Mishra, H. Idei, H. Zushi, K. Nagata, R. Akimoto, M. K. Yamamoto, K. Hanada, M. Hasegawa, K. Nakamura, A. Fujisawa, Y. Nagashima, S. Banerjee, T. Onchi, A. Kuzmin, Thermal imaging of plasma with a phased array antenna in QUEST, Review of Scientific Instruments, 85, 11, E808, 2014.11.
27. O. Mitarai, Y. Ding, M. Hubeny, Y. Lu, T. Onchi, D. McColl, C. Xiao, A. Hirose, Plasma current sustainment after iron core saturation in the STOR-M tokamak, Fusion Engineering and Design, 89, 9-10, 2467, 2014.10.
28. M. Dreval, M. Hubeny, Y. Ding, T. Onchi, Y. Liu, K. Hthu, S. Elgriw, C. Xiao, A. Hirose, Plasma confinement modification and convective transport suppression in the scrape-off layer using additional gas puffing in the STOR-M tokamak, Plasma Physics and Controlled Fusion, 55, 3, 035004, 2013.03.
29. T. Onchi, Y. Liu, M. Dreval, D. McColl, S. Elgriw, D. Liu, T. Asai, C. Xiao, A. Hirose, Effects of compact torus injection on toroidal flow in the STOR-M tokamak, Plasma Physics and Controlled Fusion, 55, 3, 035003, 2013.03.
30. R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose, Asymmetric toroidal flux generation due to phase locking of internally resonant tearing modes in the RELAX reversed-field pinch, Plasma Physics and Controlled Fusion, 55, 1, 015005, 2013.01.
31. C. Xiao, S. Elgriw, Y. Liu, T. Onchi, M. Dreval, M. Hubeny, Y. Ding, T. Asai, A. Hirose, Modification of toroidal flow in the STOR-M tokamak, Proc. 24th Int. Conf. on Fusion Energy (San Diego, CA, 2012), 2012.10.
32. R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose, Phase Locking and Unlocking Associated with Transition to Quasi-Single Helicity State in the RELAX Reversed-Field Pinch, Journal of the Physical Society of Japan, 81, 11, 115001, 2012.10.
33. T. Onchi, Y. Liu, M. Dreval, D. McColl, T. Asai, S. Wolfe, C. Xiao and A. Hirose, Fuelling Effect of Tangential Compact toroid injection in STOR-M Tokamak, CNS(Canadian Nuclear Society)2012 conference paper, 137, 2012.06.
34. C. Xiao, T.Onchi, Y. Liu, S. Elgriw, M.Dreval, D. McColl, T. Asai, and A. Hirose, Recent Experiments on the STOR-M Tokamak, CNS(Canadian Nuclear Society)2012 conference paper, 158, 2012.06.
35. A. Sanpei, K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, K. Nishimura, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi, Design and Initial Result of Time-Resolved Vertical Soft X-Ray Imaging System in Low-A RFP, Plasma and Fusion Research, 7, 2402052, 2012.06.
36. A. Sanpei, K. Oki, M. Nakamura, A. Higashi, H. Motoi, D. Fukahori, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi, R. Ikezoe, Tangential Image of Helical SXR Emissivity Structure in Low-Aspect-Ratio RFP, Plasma Science, IEEE Transactions on, 39, 11, 2410, 2011.11.
37. T. Onchi, R. Ikezoe, K. Oki, A. Sanpei, H. Himura, S. Masamune, N. Nishino, H. Koguchi, Observation of Helical Structure by Imaging Diagnostics in a Low-Aspect-Ratio Reversed Field Pinch, Journal of the Physical Society of Japan, 80, 11, 114501, 2011.10.
38. A. SANPEI, K. OKI, M. NAKAMURA, A. HIGASHI, H. MOTOI, D. FUKAHORI, H. HIMURA, S. MASAMUNE, S. OHDACHI, N. NISHINO, T. ONCHI, R. IKEZOE, Initial Result of Successive SXR Imaging Measurement in Low-A RFP, Plasma and Fusion Research, 6, 2011.07.
39. R. Ikezoe, K. Oki, T. Onchi, Y. Konishi, M. Sugihara, S. Fujita, A. Sanpei, H. Himura, S. Masamune, Extended operational regimes and MHD behavior in a low-aspect-ratio reversed field pinch in RELAX, Plasma Physics and Controlled Fusion, 53, 2, 025003, 2011.02.
40. A. Sanpei, R. Ikezoe, T. Onchi, K. Oki, M. Sugihara, Y. Konishi, S. Fujita, M. Nakamura, A. Higashi, H. Motoi, H. Himura, S. Masamune, Recent Progress in Low-A RFP Plasma Research in RELAX, Plasma and Fusion Research, 5, S2063, 2010.12.
41. M. Sugihara, K. Oki, R. Ikezoe, T. Onchi, A. Sanpei, H. Himura, S. Masamune, T. Akiyama, A. Ejiri, K. Sakamoto, K. Nagasaki, V. Zhuravlev, Density Regimes of Low-Aspect-Ratio RFP Plasmas in RELAX, Plasma and Fusion Research, 5, S2061, 2010.12.
42. T. Onchi, R. Ikezoe, K. Oki, A. Sanpei, H. Himura, S. Masamune, Tangential soft-x ray imaging for three-dimensional structural studies in a reversed field pinch, Review of Scientific Instruments, 81, 7, 073502, 2010.07.
43. S Masamune, A Sanpei, R Ikezoe, T Onchi, K Oki, T Yamashita, H Shimazu, H Himura, R Paccagnella, MHD Properties of Low-aspect Ratio RFP in RELAX, Journal of fusion energy, 28, 2, 187, 2009.02.
44. Akio Sanpei, Kensuke Oki, Ryuya Ikezoe, Takumi Onchi, Ken-Ichi Murata, Hiroyuki Shimazu, Tetsuo Yamashita, Shinichi Fujita, Haruhiko Himura, Sadao Masamune, Jay K Anderson, Equilibrium Reconstruction and Estimation of Neoclassical Effect in Low-Aspect-Ratio Reversed Field Pinch Experiments on RELAX, Journal of the Physical Society of Japan, 78, 1, 13501, 2009.01.
45. S. Masamune, A. Sanpei, R. Ikezoe, T. Onchi, K. Oki, T. Yamashita, H. Shimazu, K. Murata, H. Himura, N. Nishino, R. Paccagnella, Effects of Loowering the Aspect Ratio on MHD Behaviour in a Reversed Field Pinch, Proc. 22th Int. Conf. on Fusion Energy (Geneva, 2008), EX/7-1Rb, 2008.10.
46. Kensuke Oki, Ryuya Ikezoe, Takumi Onchi, Akio Sanpei, Haruhiko Himura, Sadao Masamune, Roberto Paccagnella, Observation of large-scale profile change of magnetic field in a low-aspect ratio reversed field pinch, Journal of the Physical Society of Japan, 77, 7, 75005, 2008.07.
47. Ryuya Ikezoe, Takumi Onchi, Kensuke Oki, Akio Sanpei, Haruhiko Himura, Sadao Masamune, Quasi-periodic growth of a single helical instability in a low-aspect ratio RFP, Plasma and Fusion Research, 3, 29, 2008.05.
48. Takumi Onchi, Nobuhiro Nishino, Ryuya Ikezoe, Akio Sanpei, Haruhiko Himura, Sadao Masamune, Observation of Simple Helical Structure in Low Aspect Ratio RFP Using Fast Camera, Plasma and Fusion Research, 3, 5, 2008.01.
49. Sadao Masamune, Akio Sanpei, Ryuya Ikezoe, Takumi Onchi, Ken-Ichi Murata, Kensuke Oki, Hiroyuki Shimazu, Tetsuo Yamashita, Haruhiko Himura, Characterization of Initial Low-Aspect Ratio RFP Plasmas in “RELAX”, Journal of the Physical Society of Japan, 76, 12, 123501, 2007.11.
50. Akio Sanpei, Takumi Onchi, Ryuya Ikezoe, Haruhiko Himura, Sadao Masamune, Design of Soft-X Ray Imaging System for Magnetic Islands of RFP Plasmas, Plasma and Fusion Research, 2, S1064, 2007.11.
51. Takumi Onchi, Akio Sanpei, Ryuya Ikezoe, Haruhiko Himura, Sadao Masamune, Application of Soft X-Ray Imaging System to the STE-2 RFP, Plasma and Fusion Research, 2, S1063, 2007.11.
52. Akio Sanpei, Kensuke Oki, Ryuya Ikezoe, Takumi Onchi, Hiroyuki Shimazu, Tetsuo Yamashita, Haruhiko Himura, Sadao Masamune, Characterization of equilibria in a low-aspect-ratio RFP, Journal of Plasma Fusion Research SERIES, 8, 1066.
53. S Masamune, A Sanpei, H Himura, R Ikezoe, T Onchi, M Nagata, H Hiramatsu, D Ishijima, Research plans for low-aspect ratio reversed field pinch, Fusion science and technology, 51, 2, 197.