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Stability of neutral beam driven TAE modes in DIII-D

E.J. Strait, W.W. Heidbrink, A.D. Turnbull, M.S. Chu, H.H. Duong1993年被引用 67Nuclear FusionIF 3出版社

The observed characteristics of toroidicity induced Alfven eigenmodes (TAE) in DIII-D tokamak discharges are compared in detail with predictions of various theories of TAE mode stability, and good qualitative agreement is found. The observed range of unstable toroidal mode numbers (n approximately 3-6) is consistent with theoretical predictions. For DIII-D parameters, low mode numbers are damped by coupling to the stable Alfven continuum, while high mode numbers are clamped by electron kinetic effects including coupling to kinetic Alfven waves. A threshold for destabilization is observed experimentally at a fast ion beta of approximately 1%. The predicted driving and damping rates, estimated from experimental data, balance within about a factor of two for discharges at the threshold. It is demonstrated experimentally that the damping of TAE modes can be increased by current profile control, in this case with a peaked current profile produced by a negative current ramp, in qualitative agreement with theoretical predictions. A possible stabilizing effect of discharge elongation is also observed

日本語訳

DIII-Dトカマク放電におけるトロイダル性誘起アルヴェン固有モード(TAE)の観測特性を、TAEモード安定性に関する様々な理論の予測と詳細に比較し、良好な定性的一致が見られる。不安定なトロイダルモード数(n≒3-6)の観測範囲は、理論的予測と一致している。DIII-Dパラメータでは、低モード数は安定なアルヴェン連続体への結合によって減衰され、一方、高モード数は運動論的アルヴェン波への結合を含む電子運動論効果によって抑制される。不安定化の閾値は、高速イオンベータが約1%で実験的に観測される。実験データから推定された予測駆動率と減衰率は、閾値における放電に対して約2倍の範囲内で釣り合っている。TAEモードの減衰は、電流分布制御によって増大させることができることが実験的に実証されており、この場合、負の電流ランプによって生成されたピーク状電流分布を用いており、理論的予測と定性的に一致している。放電の伸長度による可能性のある安定化効果も観測される。

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diii-d高精度(タイトル一致)

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DIII-DNeutral beamToroidal Alfvén Eigenmode
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