Kyushu University Academic Staff Educational and Research Activities Database
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Nagashima Yoshihiko Last modified date:2017.04.07



Graduate School
Other Organization


E-Mail
Homepage
http://www.triam.kyushu-u.ac.jp/fujisawaken/index.html
Home page of Fujisawa-Nagashima Lab in Advanced Fusion Research Center .
Academic Degree
Doctor of Science
Field of Specialization
plasma physics
Outline Activities
Our research group explores experimental study on fluctuations and waves in plasmas. Plasma is the universal state in nature and laboratory, and has complex self-regulated medium. There are various kinds of fluctuations and waves in plasmas, and they play significant roles in structural formation of plasma media. Turbulence plasmas, excited from fluctuations, contribute loss of particle, energy, and momentum of plasmas. In addition, energy partition among waves and between wave and particle via linear and non-linear interactions. Therefore, study on fluctuations and waves in plasmas can develop understanding of structural formation of plasmas in nature, and innovation of fusion plasmas.
Research themes in our laboratory are as following,
1. learning skills of experiment,
2. measuring fluctuations and waves,
3. applying data analysis techniques to observed data,
4. extracting deep physics of fluctuations, waves and turbulence.
In addition, we also explore
5. controlling actively plasmas by radio-frequency heating and current drive, and observing response of RF to fluctuation data.
Our experimental devices are QUEST spherical tokamak for fusion plasma study, and PANTA linear device for basic plasma turbulence study, in Research Institute for Applied Mechanics, Kyushu University.
Our group has research collaborations with the University of Tokyo.
Research
Research Interests
  • Experimental study on plasma wave, fluctuation, and turbulence
    keyword : plasma turbulence, zonal flow, bispectrum, rediofrequency wave heating
    1998.04~2011.05.
Academic Activities
Papers
1. Yoshihiko Nagashima, Shigeru Inagaki, Akihide Fujisawa, Hiroyuki Arakawa, Takuma Yamada, Yudai Miwa, Tatsuya Kobayashi, Sanae-I Itoh, Kimitaka Itoh, Observation of Parallel Force Balance for Drift Wave Fluctuation by a Fast Voltage Sweeping Method in a Linear Plasma, Journal of the Physical Society of Japan, 84.0, 6.0, 3.0, Article No. 063501, 2015.05.
2. Nagashima, Yoshihiko; Itoh, Sanae-I.; Inagaki, Shigeru; Arakawa, Hiroyuki; Kasuya, Naohiro; Fujisawa, Akihide; Kamataki, Kunihiro; Yamada, Takuma; Shinohara, Shunjiro; Oldenbuerger, Stella; Yagi, Masatoshi; Takase, Yuichi; Diamond, Patrick H.; Itoh, Kimitaka, Non-Gaussian properties of global momentum and particle fluxes in a cylindrical laboratory plasma, PHYSICS OF PLASMAS, 18.0, 7.0, 1.0, 70701.0, 2011.07.
3. Yoshihiko NAGASHIMA, Akira EJIRI, Yuichi TAKASE, Masateru SONEHARA, Hidetoshi KAKUDA, Takuya OOSAKO, Junichi HIRATSUKA, Osamu WATANABE, Takashi YAMAGUCHI, Hiroaki KOBAYASHI, Takuma WAKATSUKI, Takuya SAKAMOTO, Kentaro HANASHIMA, Takanori AMBO, Ryota SHINO and Shigeru INAGAKI, Evaluation of Edge Electron Temperature Fluctuation by the Use of Fast Voltage Scanning Method on TST-2, Plasma and Fusion Research, 6.0, RA, Article No. 2402036, 2011.07.
4. Nagashima, Yoshihiko; Inagaki, Shigeru; Kamakaki, Kunihiro; Arakawa, Hiroyuki; Yamada, Takuma; Shinohara, Shunjiro; Kawai, Yoshinobu; Yagi, Masatoshi; Fujisawa, Akihide; Itoh, Sanae-I; Itoh, Kimitaka; Takase, Yuichi, Development of radially movable multichannel Reynolds stress probe system for a cylindrical laboratory plasma, REVIEW OF SCIENTIFIC INSTRUMENTS, 82.0, 3.0, 1.0, Article No. 033503, 2011.03.
5. Yoshihiko NAGASHIMA, Jun'ichi OZAKI, Masateru SONEHARA, Yuichi TAKASE, Akira EJIRI, Kotaro YAMADA, Hidetoshi KAKUDA, Shigeru INAGAKI, Takuya OOSAKO, Byung Il AN, Hiroyuki HAYASHI, Kentaro HANASHIMA, Junichi HIRATSUKA, Hiroaki KOBAYASHI, Hiroki KURASHINA, Hazuki MATSUZAWA, Takuya SAKAMOTO, Takashi YAMAGUCHI, Osamu WATANABE and Takuma WAKATSUKI, Fluctuation measurement in the edge plasma on TST-2, Plasma and Fusion Research, 5.0, RA, Article No. S2049, 2010.12.
6. Yoshihiko NAGASHIMA, Kenichi NAGAOKA, Kimitaka ITOH, Akihide FUJISAWA, Mitsutaka ISOBE, Tsuyoshi AKIYAMA, Chihiro SUZUKI, Shin NISHIMURA, Yasuo YOSHIMURA, Keisuke MATSUOKA, Shoichi OKAMURA, Yuichi TAKASE, Akira EJIRI, Sanae -I. ITOH, Masatoshi YAGI, and CHS Group, Observation of edge Reynolds stress increase preceding an L-H transition in Compact Helical System, Plasma and Fusion Research, 5.0, RC, Article No. 022, 2010.10.
7. Yoshihiko Nagashima, Takuya Oosako, Yuichi Takase, Akira Ejiri, Osamu Watanabe, Hiroaki Kobayashi, Yuuki Adachi, Hiroshi Tojo, Takashi Yamaguchi, Hiroki Kurashina, Kotaro Yamada, Byung Il An, Hiroshi Kasahara, Fujio Shimpo, Ryuhei Kumazawa, Hiroyuki Hayashi, Haduki Matsuzawa, Junichi Hiratsuka, Kentaro Hanashima, Hidetoshi Kakuda, Takuya Sakamoto, and Takuma Wakatsuki, Observation of beat oscillation generation by coupled waves associated with parametric decay during radio frequency wave heating of a spherical tokamak plasma, Physical Review Letters, 104.0, 24.0, Article No. 245002, 2010.06.
8. Nagashima Yoshihiko, A. Ejiri, Fujisawa Akihide, Y. Takase, Calculation of Beam Trajectories of a Heavy Ion Beam Probe Diagnostic in the TST-2 Spherical Tokamak, IEEJ Transactions on Fundamentals and Materials, 129.0, 9.0, 2009.09.
9. Yoshihiko NAGASHIMA, Sanae-I. ITOH, Kimitaka ITOH, Akihide FUJISAWA, Shigeru INAGAKI, Yoshinobu KAWAI, Shunjiro SHINOHARA, Masayuki FUKAO, Takuma YAMADA, Kenichiro TERASAKA, Takashi MARUTA, Kunihiro KAMATAK, Hiroyuki ARAKAWA, Masatoshi YAGI, Naohiro KASUYA, George R. TYNAN, Patrick H. DIAMOND, and Yuichi Takase, Reynolds Stress Measurements for Investigation of Nonlinear Processes of Turbulence in the Large Mirror Device and in the Large Mirror Device-Upgrade, JOURNAL OF NUCLEAR MATERIALS, 8.0, 2009.08.
10. Nagashima, Y.; Itoh, K.; Fujisawa, A.; Shinohara, K.; Itoh, S-I; Ido, T.; Yagi, M.; Hoshino, K.; Ejiri, A.; Takase, Y.; Uehara, K.; Miura, Y., Boundary of the geodesic acoustic eigenmode in the vicinity of the magnetic separatrix, PLASMA PHYSICS AND CONTROLLED FUSION, 51.0, 6.0, 10.0, Article No. 065019, 2009.06.
11. Nagashima, Yoshihiko; Itoh, Sanae-I.; Shinohara, Shunjiro; Fukao, Masayuki; Fujisawa, Akihide; Terasaka, Kenichiro; Kawai, Yoshinobu; Tynan, George R.; Diamond, Patrick H.; Yagi, Masatoshi; Inagaki, Shigeru; Yamada, Takuma; Itoh, Kimitaka, Observation of the parametric-modulational instability between the drift-wave fluctuation and azimuthally symmetric sheared radial electric field oscillation in a cylindrical laboratory plasma, PHYSICS OF PLASMAS, 16.0, 2.0, 1.0, 20706.0, 2009.02.
12. Nagashima, Yoshihiko; Itoh, Sanae-I; Shinohara, Shunjiro; Fukao, Masayuki; Fujisawa, Akihide; Terasaka, Kenichiro; Kawai, Yoshinobu; Kasuya, Naohiro; Tynan, George R.; Diamond, Patrick H.; Yagi, Masatoshi; Inagaki, Shigeru; Yamada, Takuma; Itoh, Kimitaka, Coexistence of Zonal Flows and Drift-Waves in a Cylindrical Magnetized Plasma, JOURNAL OF NUCLEAR MATERIALS, 77.0, 11.0, Article No. 114501, 2008.11.
13. Yoshihiko NAGASHIMA, Sanae -I. ITOH, Shunjiro SHINOHARA, Masayuki FUKAO, Akihide FUJISAWA, Kenichiro TERASAKA, Yoshinobu KAWAI, Naohiro KASUYA, Masatoshi YAGI, Shigeru INAGAKI, Takuma YAMADA and Kimitaka ITOH, Nonlinear energy transfer of drift-wave fluctuation in a cylindrical laboratory plasma, Plasma and Fusion Research, 3.0, RC, 2.0, Article No. 056, 2008.10.
14. Nagashima, Y.; Itoh, K.; Itoh, S-I; Fujisawa, A.; Yagi, M.; Hoshino, K.; Shinohara, K.; Ejiri, A.; Takase, Y.; Ido, T.; Uehara, K.; Miura, Y., In search of zonal flows by using direct density fluctuation measurements, PLASMA PHYSICS AND CONTROLLED FUSION, 49.0, 10.0, 15.0, 2007.10.
15. Yoshihiko NAGASHIMA, Katsumichi HOSHINO, Kenichi NAGAOKA, Kouji SHINOHARA, Akihide FUJISAWA, Kazuya UEHARA, Yoshinori KUSAMA, Katsumi IDA, Yasuo YOSHIMURA, Shoichi OKAMURA, Keisuke MATSUOKA, Akira EJIRI, Yuichi TAKASE, Kimitaka ITOH, Masatoshi YAGI, Sanae-I. ITOH, JFT-2M group and CHS group, Experimental study of nonlinear processes in edge turbulence of toroidal plasmas, Plasma and Fusion Research, 1.0, RA, 15.0, Article No. 041, 2006.09.
16. Nagashima, Y; Itoh, K; Itoh, SI; Hoshino, K; Fujisawa, A; Ejiri, A; Takase, Y; Yagi, M; Shinohara, K; Uehara, K; Kusama, Y, Observation of coherent bicoherence and biphase in potential fluctuations around geodesic acoustic mode frequency on JFT-2M, PLASMA PHYSICS AND CONTROLLED FUSION, 48.0, 0.0, #, 0.0, 2006.05.
17. Nagashima, Y; Itoh, SI; Yagi, M; Itoh, K; Fujisawa, A; Hoshino, K; Shinohara, K; Uehara, K; Kusama, Y; Ejiri, A; Takase, Y, Convergence study of bispectral analysis in experiments of high temperature plasmas, REVIEW OF SCIENTIFIC INSTRUMENTS, 77.0, 4.0, 6.0, Article No. 045110, 2006.04.
18. Nagashima, Y; Itoh, K; Itoh, SI; Fujisawa, A; Hoshino, K; Takase, Y; Yagi, M; Ejiri, A; Ida, K; Shinohara, K; Uehara, K; Kusama, Y, Bispectral analysis applied to coherent floating potential fluctuations obtained in the edge plasmas on JFT-2M, PLASMA PHYSICS AND CONTROLLED FUSION, 48.0, 4.0, 15.0, 2006.04.
19. Y. Nagashima, K. Hoshino, A. Ejiri, K. Shinohara, Y. Takase, K. Tsuzuki, K. Uehara, H. Kawashima, H. Ogawa, T. Ido, Y. Kusama, and Y. Miura, Observation of Nonlinear Coupling between Small-Poloidal Wave-Number Potential Fluctuations and Turbulent Potential Fluctuations in Ohmically Heated Plasmas in the JFT-2M Tokamak, Physical Review Letters, 95.0, Article No. 095002, 2005.08.
20. Y Nagashima, K Shinohara, K Hoshino, A Ejiri, K Tsuzuki, T Ido, K Uehara, H Kawashima, K Kamiya, H Ogawa, T Yamada, S Shiraiwa, S Ohara, Y Takase, N Asakura, N Oyama, T Fujita, S Ide, H Takenaga, Y Kusama, Y Miura and JFT-2M group, Coherent edge fluctuation measurements in H-mode discharges on JFT-2M, PLASMA PHYSICS AND CONTROLLED FUSION, 46.0, 5A, 2004.05.
Other Research Activities
  • 2011.12, Study of causal relationship between formation process of plasma flow and global momentum transport driven by turbulence.
  • 2012.04, Study on direct measurement of mechanism behind zonal flow generation using nonlinear analysis on plasma turbulence.
Membership in Academic Society
  • The Physical Society of Japan
  • The Japan Society of Plasma Science and Nuclear Fusion Research
  • The Institute of Electrical Engineers of Japan
  • American Physical Society
Awards
  • Study on direct measurement of mechanism behind zonal flow generation using nonlinear analysis on plasma turbulence
  • Study of causal relationship between formation process of plasma flow and global momentum transport driven by turbulence
Educational