HT-7托卡马克等离子体离子温度特性研究

Investigation of Ion Temperature Characteristics in the HT-7 Tokamak

摘要: 利用建立的电荷复合交换光谱诊断系统 (CXRS)对HT-7托卡马克装置上三种加热条件 (包括欧姆加热, 低杂波以及离子回旋加热)下的离子温度特性进行研究。分析了三种加热条件下离子温度特征。结果表明, 在欧姆放电下芯部离子温度T_i0与弦平均密度`n_e、等离子体电流I_p满足1/3的幂指数关系且符合Artsimovich给出的温度定标T_i0= K× (I_p×B_t×`n_e ×R²)^1/3；在低杂波以及离子回旋加热条件下, 均观测到离子温度略微增加, 然而离子温度的增加主要是由电子与离子的碰撞引起的, 而非波对离子的直接加热效应。

Abstract: Characteristics of ion temperature measured with Charge-Exchange Recombination Spectroscopy (CXRS) were studied in Ohmic, Lower-Hybrid-Wave (LHW) driven and Ion-Cyclotron-Resonance-Frequency (ICRF) heated plasmas in HT-7. The results indicate that the central ion temperature T_i0 follows the one-third power law in the product of central line-averaged density`n_e and plasma current I_p in Ohmic discharges and is therefore consistent with the Artsimovich scaling law T_i0= K× (I_p×B_t×`n_e ×R²)^1/3. It is shown that there is an appreciable increase of ion temperature during the operation with both LHW and ICRF and that the increment of ion temperature in those shots is mainly due to the energy transfer via collisions between ions and electrons rather that by direct heating of the ions.

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