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Measurements of fast-ion losses induced by MHD instabilities using a scintillator-based probe in the HL-2A tokamak

Y.P. Zhang, Yi Liu, W. Chen, Y. Xu, M. Isobe, D. Li, X.Q. Ji, Y.B. Dong, X.T. Ding, G.L. Yuan2015年被引用 18Nuclear FusionIF 3出版社

Characteristics of fast-ion losses induced by various magnetohydrodynamic (MHD) instabilities, such as tearing mode (TM), long-lived mode (LLM), and sawtooth crash, have been observed and experimentally investigated in the HL-2A tokamak. To study fast-ion losses, a new scintillator-based lost-fast ion probe has been developed and used, and an increment of the fast-ion loss rate as the MHD amplitude increase has been measured. Compared with TM and LLM, the fast-ion losses induced by sawtooth crash have a broad range in energy and pitch angle. There may be some interactions between fast ions and magnetic disturbance, which cause the losses with a wide range of energy and pitch angle. During disruptions, the total neutron emission rate drops by ~90% as a result of the strong fast-ion losses. The possible reasons for this phenomenon are the strong magnetic perturbations and the drastic change of the fast-ion transport. In addition, the clear experimental evidence of drastic losses of fast ions during disruptions have been obtained.

日本語訳

種々のMHD(磁気流体力学)不安定性、例えばティアリングモード(TM)、長寿命モード(LLM)、および鋸歯状波クラッシュによって誘起される高速イオン損失の特性が、HL-2Aトカマクにおいて観測され、実験的に調査された。高速イオン損失を研究するために、新しいシンチレータベースの損失高速イオンプローブが開発・使用され、MHD振幅の増加に伴う高速イオン損失率の増加が測定された。TMおよびLLMと比較して、鋸歯状波クラッシュによって誘起される高速イオン損失は、エネルギーとピッチ角の広い範囲を持つ。高速イオンと磁気擾乱の間に何らかの相互作用が存在し、それが広いエネルギーおよびピッチ角範囲の損失を引き起こす可能性がある。ディスラプション中、全中性子放出率は、強い高速イオン損失の結果として約90%低下する。この現象の考えられる理由は、強い磁気摂動と高速イオン輸送の急激な変化である。さらに、ディスラプション中の高速イオンの急激な損失の明確な実験的証拠が得られた。

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Fusion Advanced Studies TorusMagnetohydrodynamicsEnergetic ionHL-2AMHD instabilitiesIon loss
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