【作者】 黄千红； 龚学余； 杨磊； 李新霞； 路兴强； 余俊；

【Author】 HUANG Qian-hong,GONG Xue-yu, YANG Lei,LI Xin-xia,LU Xing-qiang,YU Jun (Department of Nuclear Science and Technology,University of South China,Hengyang of Hunan Prov.421001,China)

【机构】 南华大学核科学技术学院；

【摘要】 本文对中性束在注入环截面大纵横比托卡马克中加热下产生的快离子自举电流进行了数值研究。数值模拟得到了快离子自举电流密度分布和大小,研究表明自举电流的大小既敏感的依赖于中性束注入的角度,平行注入时较小,接近垂直时迅速增大;同时也较强地依赖于快离子的产生速度与临界速度的比值,自举电流的大小随注入束能量的增加而迅速增大。另外,中性束注入下的自举电流总伴随着由于动量输运而产生的电子回流,考虑电子回流的影响,净电流密度显著减小,且电流密度峰值向等离子体中心偏移。更多还原

【Abstract】 The bootstrap current of fast ions produced by the neutral beam injection is investigated in a large aspect ratio tokamak with circular cross-section under specific parameters.The bootstrap current density distribution and the total bootstrap current are figured out.In addition,the beam bootstrap current always accompanies the electron return current due to the parallel momentum transfer from fast ions.With the electron return current considered,the net current density obviously decreases due to electron return current,at the same time the peak of current moves towards the centre plasma.Numerical results show that the value of the net current depends sensitively not only on the angle of the neutral beam injection but also on the ratio of the velocity of fast ions to the critical velocity:the value of net current is small for the neutral beam parallel injection but increases multipliedly for perpendicular injection,and increases with beam energy increasing.更多还原