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Suppression of MHD instabilities by ion Bernstein wave (IBW) heating in the HT-7 tokamak

C M Qin, Y P Zhao, D C Li, X J Zhang, P Xu, Y Yang, ICRF team, HT-7 team2010年Plasma Physics and Controlled FusionIF 2.2出版社

In the HT-7 tokamak, the m = 2/n = 1 tearing mode can be effectively suppressed by the ion Bernstein wave (IBW) when the location of power deposition is near the q = 2 rational surface. Off-axis electron heating and electron density broadening have been observed. In the meantime, the particle confinement is improved with an increase in electron density and a drop in Dα emission. The induced large electron density gradients and electron pressure gradients can be spatially correlated with the IBW deposition profile via theoretical calculation. It is suggested that off-axis IBW heating modified the electron pressure profile and the current density profile can be redistributed, thus resulting in the suppression of the magnetohydrodynamics (MHD) instability. It provides an integrated way for both the stabilization of tearing modes and controlling pressure profiles.

日本語訳

HT-7トカマクにおいて、m = 2/n = 1ティアリングモードは、電力堆積位置がq = 2有理面近傍にある場合、イオンバーンスタイン波(IBW)によって効果的に抑制され得る。オフアクシス電子加熱と電子密度の広がりが観測された。同時に、電子密度の増加とDα発光の低下を伴う粒子閉じ込めの改善が見られた。誘起された大きな電子密度勾配と電子圧力勾配は、理論計算によりIBW堆積プロファイルと空間的に相関付けられることが示された。オフアクシスIBW加熱が電子圧力プロファイルを修正し、電流密度プロファイルを再分布させることにより、MHD不安定性の抑制がもたらされることが示唆される。これは、ティアリングモードの安定化と圧力プロファイルの制御の両方に対する統合的な手法を提供する。

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MagnetohydrodynamicsBernstein waveHT-7MHD instabilitiesIon Bernstein wave
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