HT-7托卡马克中低杂波和离子波恩斯坦波协同作用的数值研究

Numerical Investigation on Synergistic Effect Between IBW and LHW in HT-7 Tokamak

用隐含5点模式对二维Fokker_Planck方程进行离散化,调用NAG程序库中子函数D03UAF求解该方程,并将求解二维Fokker_Planck方程的code与波的射线轨迹code相结合,根据HT_7托卡马克装置参数,分别对有或没有IBW情况下的等离子体电流的全波驱动和在低杂波和离子伯恩斯坦波协同作用下低杂波的功率沉积分布、驱动电流分布等进行数值模拟研究.结果显示:有IBW情况下的全波驱动电流分布比没有IBW时全波驱动的电流分布区域要广一些,而且驱动的总电流也大一点;在双波协同作用下,全波驱动的等离子体电流空间分布随IBW的频率和n∥谱的变化而变化;在两波协同作用下低杂波驱动非感应电流的效率得到了很大的改善.

A 2-D Fokker-Planck equation is discretized and solved by an implicit 5-poiut scheme and the NAG library routine BO3UAF. With a my-tracing code combined with a Fokker-Planck equation, the effect of the local synergistic interaction between LHW and IBW and current fully driven by waves with or without IBW in the HT-7 Tokamak are studied. Numerical simulations show that the LHW power deposition profile and the driven current distribution are modified due to the interaction between IBW and LHW and the efficiency of LHCD is improved. The current distribution driven completely by LHW expands obviously than the one driven fully by LHW ＋ IBW. The current distribution driven by waves changes with frequencies and n// spectrum of IBW during the synergy of LHW ＋ IBW.