2012 Fiscal Year Final Research Report
Transition to helical RFP states and associated confinement improvement in a spherical RFP
| Project/Area Number |
22360390
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
MASAMUNE Sadao 京都工芸繊維大学, 工芸科学研究科, 教授 (00157182)
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| Co-Investigator(Kenkyū-buntansha) |
HIMURA Haruhiko 京都工芸繊維大学, 工芸科学研究科, 准教授 (30311632)
SANPEI Akio 京都工芸繊維大学, 工芸科学研究科, 助教 (90379066)
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| Project Period (FY) |
2010 – 2012
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| Keywords | プラズマ・核融合 / 自己組織化 / エネルギー全般 |
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| Research Abstract |
It has been confirmed from experimental results in RELAX that the quasi-single helicity (QSH) state can be achieved easily in low-aspect-ratio machine. Magnetic measurements and soft-X ray imaging diagnostics have revealed dense or high-temperature helical core with steep gradient in the SXR emissivity profile at the helical boundary which may suggest the electron thermal transport barrier in the QSH state. Feedback stabilization of the m/n=1/2 kink mode (RWM) has resulted in improved discharge duration by ~50% (from 2 ms to 3 ms). The Thomson scattering measurement has revealed that the central electron temperature reaches 200eV at Ip~120kA, corresponding to the electron beta of ~10%. The electron parameters have reached the designed values in the low-A RFP machine RELAX.
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Research Products
(67 results)
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[Journal Article] Design and Initial Result of Time-Resolved Vertical Soft X-Ray Imaging System in Low-A RFP2012
Author(s)
A. Sanpei, K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, K. Nishimura, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi
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Journal Title
Plasma Fusion Res
Volume: 2402052
Pages: 7
DOI
Peer Reviewed
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[Journal Article] Tangential Image of Helical SXR Emissivity Structure in Low-Aspect-Ratio RFP2011
Author(s)
A. Sanpei, K. Oki, M. Nakamura, A. Higashi, H. Motoi, D. Fukahori, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi, R. Ikezoe
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Journal Title
IEEE Transaction Plasma Science
Volume: 2410
Pages: 39
DOI
Peer Reviewed
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[Journal Article] Initial Result of Successive SXR Imaging Measurement in Low-A RFP2011
Author(s)
A. Sanpei, K. Oki, M. Nakamura, A. Higashi, H. Motoi, D. Fukahori, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onch, R. Ikezoe
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Journal Title
Plasma Fusion Res
Volume: 2406096
Pages: 6
DOI
Peer Reviewed
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[Journal Article] Effect of pressure-driven MHD instabilities on confinement in reactor-relevant high-beta helical plasmas2011
Author(s)
K.Y. Watanabe, S. Masamune, Y. Takemura, H. Funaba, S. Sakakibara, F. Watanabe, K. Tanaka, S. Ohdachi, K. Toi, Y. Narushima, and LHD Experiment Group
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Journal Title
Phys. Plasmas
Volume: 056119
Pages: 18
DOI
Peer Reviewed
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[Journal Article] Recent Progress in Low-A RFP Plasma Research in RELAX2010
Author(s)
A.Sanpei, R. Ikezoe, T. Onchi, K. Oki, M. Sugihara, Y. Konishi, S. Fujita, M. Nakamura, A. Higashi, H. Motoi, H. Himura, S. Masamune
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Journal Title
Plasma Fusion Res
Volume: S2063
Pages: 5
DOI
Peer Reviewed
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[Journal Article] Density Regimes of Low-Aspect-Ratio RFP Plasmas in RELAX2010
Author(s)
M. Sugihara, K. Oki, R. Ikezoe, T. Onchi, A. Sanpei, H. Himura, S. Masamune, T. Akiyama, A. Ejiri, K. Sakamoto, K. Nagasaki, V. Zhuravlev
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Journal Title
Plasma Fusion Res
Volume: S2061
Pages: 5
DOI
Peer Reviewed
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