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Thermal ions heat transport induced by reversed shear Alfvén eigenmode on the HL-2A tokamak

P.W. Shi, Z.Y. Qiu, W. Chen, Z.X. Wang, Z.B. Shi, L.M. Yu, Z.C. Yang, W.L. Zhong, M. Jiang, X.Q. Ji2020年被引用 10Nuclear FusionIF 3出版社

Experimental investigations of thermal ions heat transport induced by reversed shear Alfvén eigenmodes (RSAEs) have been carried out on the HL-2A tokamak. It is found that the RSAEs are driven unstable by passing particles during the second half of sawtooth periods, and can not only degrade the bremsstrahlung radiations, but also cause obvious reduction of the ion temperature in the core plasma. Interestingly, the RSAEs excited by energetic ions can resonant with the thermal ions, and then lead to a heat transport process. Statistical results suggest there is a quadratic dependence between thermal ion heat flux perturbation and mode amplitude, which indicates a diffusive mechanism of plasma transport and is well explained by the theoretical interpretations derived from quasi-linear transport theory.

日本語訳

HL-2Aトカマクにおいて、反転シア・アルヴェン固有モード(RSAEs)によって誘起される熱イオン輸送の実験研究が実施された。RSAEsは、セーバートゥース周期の後半において通過粒子によって不安定化されることが見出され、これらは制動放射を劣化させるだけでなく、コアプラズマ中のイオン温度の顕著な低下を引き起こすことが明らかになった。興味深いことに、高エネルギーイオンによって励起されたRSAEsは熱イオンと共鳴し、その結果として熱輸送過程を引き起こすことが示された。統計的解析の結果、熱イオンフラックスの摂動とモード振幅の間には2次関数的な依存関係が存在することが示され、これはプラズマ輸送の拡散的機構を示唆しており、準線形輸送理論から導かれる理論的解釈によって十分に説明される。

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Alfvén waveAlfvén eigenmodeHL-2AHeat transportReversed magnetic shearShear Alfvén waves
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