Intermittent plasma bursts across the last closed flux surface in a highly overdense spherical torus generated by electron Bernstein wave heating
| Project/Area Number |
18H01198
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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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| Review Section |
Basic Section 14020:Nuclear fusion-related
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| Research Institution | Kyoto University |
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Principal Investigator |
Uchida Masaki 京都大学, エネルギー科学研究科, 准教授 (90322164)
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| Co-Investigator(Kenkyū-buntansha) |
田中 仁 京都大学, エネルギー科学研究科, 教授 (90183863)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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| Keywords | 球状トーラス / 無誘導起ち上げ / 電子バーンスタイン波 / 不安定性 / 球場トーラス / 電子バーンスタイン波加熱 / 無誘導立ち上げ |
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| Outline of Final Research Achievements |
A soft X-ray computer tomography system and a magnetic probe array system were designed, fabricated, and installed in the LATE device to observe the plasma behavior during the intermittent plasma bursts across the last closed flux surface (LFCS) in highly overdense spherical tokamak plasmas maintained solely by the electron Bernstein wave heating and current drive. Intense and frequent plasma bursts are observed when the plasma current reaches 10kA and the electron density exceeds 7 times the plasma cutoff density. The X-ray reconstruction image shows a peaked profile centered at the plasma current center which is located the outboard side of the LCFS. Magnetic probe array data shows the toroidal current variation such that the ejected electrons (or ions) from inside the LCFS upon the burst move from the midplane to the top (or bottom) of the device along the magnetic field lines.
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| Academic Significance and Societal Importance of the Research Achievements |
電子バーンスタイン波により無誘導に形成された遮断密度の約７倍の球状トカマクにおいて、電子密度上昇とともに現れる間欠的プラズマ噴出の詳細課程について、軟X線CTシステムの設計・製作、磁気プローブ増設、重イオンビームプローブの整備を行い、プラズマ噴出の際のトロイダル電流の変化、軟X線発光像の変化を追跡した。この結果をもとにプラズマ噴出の制御が可能となれば、球状トカマクの無誘導起動の実現性が高まり、低コスト核融合炉へ道が開ける。
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Report
(4 results)
Research Products
(17 results)
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[Presentation] 球状トカマク装置LATEにおける4台のピンホールカメラを用いた軟X線CTシステムの構築2020
Author(s)
長えき巧巳, 打田正樹, 梶田竜助, 出田雄己, 野澤嘉孝, 郭星宇, 芦田涼, 中井亮太朗, 吉岡慎太郎, 田中仁, 前川孝
Organizer
プラズマ核融合学会
Related Report
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[Presentation] LATE球状トカマクプラズマの空間電位計測用HIBPにおける入射イオンビーム制御による2次ビーム電流の最大化2020
Author(s)
中井亮太朗, 吉岡慎太郎, 野澤嘉孝, 梶田竜助, 郭星宇, 芦田涼, 長えき巧巳, 出田雄己, 田中仁, 打田正樹, 前川孝
Organizer
プラズマ核融合学会
Related Report
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[Presentation] 磁気プローブアレイによる LATEマイクロ波球状トカマクにおける間欠的プラズマ噴出の観測と解析2019
Author(s)
梶田 竜助, 野澤 嘉孝, 郭 星宇, 松井 三四郎, 山形 周平,久津間 哲人, 中井 隆裕, 芦田 涼, 中井 亮太朗, 長エキ 拓巳，打田 正樹, 田中 仁, 前川 孝
Organizer
プラズマ・核融合学会
Related Report
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[Presentation] Electron Bernstein Wave Heating and Current Drive with Multi-Electron Cyclotron Resonances During Non-inductive Start-up on LATE2018
Author(s)
H. Tanaka, Y. Nozawa, M. Uchida, R. Kajita, Y. Omura, Y. Sakai, H. Shirai, J. Ootani, K. Goto, W. Tsukamoto, T. Noguchi, X. Guo, T. Maekawa
Organizer
27th IAEA Fusion Energy Conference
Related Report
Int'l Joint Research
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[Presentation] Non-inductive formation of overdense spherical tokamak plasmas by electron Bernstein waves in the LATE device2018
Author(s)
H. Tanaka, Y. Nozawa, R. Kajita, J. Ootani, K. Goto, W. Tsukamoto, T. Noguchi, T. Kuzuma, T. Nakai, S. Matsui, S. Yamagata, X. Guo, M. Uchida, T. Maekawa
Organizer
2nd Asia-Pacific Conference on Plasma Physics
Related Report
Int'l Joint Research
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