Electron cyclotron current start-up using a retarding electric field in the QUEST spherical tokamak

IF 3.5 1区物理与天体物理 Q1 PHYSICS, FLUIDS & PLASMAS

Nuclear Fusion Pub Date : 2024-08-27 DOI:10.1088/1741-4326/ad6914

T. Onchi, H. Idei, K. Hanada, O. Watanabe, R. Miyata, Y. Zhang, Y. Koide, Y. Otsuka, T. Yamaguchi, A. Higashijima, T. Nagata, I. Sekiya, S. Shimabukuro, I. Niiya, K. Kono, F. Zennifa, K. Nakamura, R. Ikezoe, M. Hasegawa, K. Kuroda, Y. Nagashima, T. Ido, T. Kariya, A. Ejiri, S. Murakami, A. Fukuyama, Y. Kosuga

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Abstract

The plasma current start-up experiment is conducted through electron cyclotron (EC) heating in the QUEST spherical tokamak. During the EC heating, the application of a toroidal electric field in the opposite direction to the plasma current effectively inhibits the growth of energetic electrons. Observations show rapid increases in plasma current and hard x-ray count immediately following the cancellation of the retarding electric field. When a compact tokamak configuration maintains equilibrium on the high field side, along with the retarding field, it leads to effective bulk electron heating. This heating achieved an electron temperature of T_e ≈ 1 keV at electron density n_e > 1.0 × 10¹⁸ m⁻³. Ray tracing of the EC wave verifies that more power absorption into plasma through a single-pass occurs around the second resonance layer with higher values of electron density and temperature.

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在 QUEST 球形托卡马克中利用迟滞电场启动电子回旋加速器电流

等离子体电流启动实验是通过 QUEST 球形托卡马克中的电子回旋加速器（EC）加热进行的。在电子回旋加速器加热过程中，施加与等离子体电流方向相反的环形电场可有效抑制高能电子的增长。观测结果表明，等离子体电流和硬 X 射线计数在抑制电场取消后立即迅速增加。当紧凑型托卡马克结构在高电场一侧与阻滞电场保持平衡时，会导致有效的电子体加热。在电子密度为 ne > 1.0 × 1018 m-3 的情况下，这种加热使电子温度达到 Te ≈ 1 keV。对电离层波的射线追踪证实，在电子密度和温度值较高的第二共振层周围，通过单程吸收进入等离子体的功率更大。

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来源期刊

Nuclear Fusion 物理-物理：核物理

CiteScore

6.30

自引率

39.40%

发文量

411

审稿时长

2.6 months

期刊介绍： Nuclear Fusion publishes articles making significant advances to the field of controlled thermonuclear fusion. The journal scope includes: -the production, heating and confinement of high temperature plasmas; -the physical properties of such plasmas; -the experimental or theoretical methods of exploring or explaining them; -fusion reactor physics; -reactor concepts; and -fusion technologies. The journal has a dedicated Associate Editor for inertial confinement fusion.