输运垒中径向电场对俘获粒子运动特征的影响INFLUENCEOF.PDFVIP

CNIC-01628 SWIP-0150 输运垒中径向电场对俘获粒子运动特征的影响 INFLUENCE OF RADIAL ELECTRIC FIELD IN TRANSPORT BARRIER ON THE MOTION OF TRAPPED PARTICLES (In Chinese) 中国核情报 中心 China Nuclear Information Centre CNIC-01628 SWIP-0150 输运垒中径向电场对俘获粒子 运动特征的影响 曲文孝 曲洪鹏 高庆第 （核工业西南物理研究院，成都，610041 ） 摘 要 利用俘获粒子运动方程，并考虑到输运垒中径向电场及粒子 径向漂移引起的修正，分析了输运垒中俘获粒子的运动行为。结果 表明，输运垒中径向电场梯度对香蕉宽度、香蕉频率、环向电场引 起的径向箍缩、俘获粒子份额及香蕉区的临界碰撞频率等都有重要 影响。为了在输运垒中得到合理的粒子流及电场的径向结构，这些 影响是必须考虑的。 关键词： 径向电场，俘获粒子运动，输运垒 1 Influence of Radial Electric Field in Transport Barrier on the Motion of Trapped Particles (In Chinese) QU Wenxiao QU Hongpeng GAO Qingdi (Southwestern Institute of Physics, Chengdu, 610041) ABSTRACT Using the motion equations modified by the radial electric field and radial drift, the behavior of trapped particles in transport barrier is analyzed carefully. The gradient of the radial electric field in transport barrier is found to have substantial effects on the banana width, banana frequency, radial pinch arising from the toroidal electric field, trapped particle fraction and the critical collision frequency of banana regime. These effects should be taken into account if one expect to get reasonable particle flows and electric field structure in transport barrier. Keywords: Radial electric field ，Motion of trapped particles ，Transport barrier 2 引 言 托卡马克等离子体在输运垒中的优良的约束特性激发了人们深入研究其来源的巨大 兴趣。这种研究的一个方面是探讨径向电场的径向变化对各种不稳定性的影响。径向电 场的形成，维持及其对粒子运动特征的影响是这类研究的基础，更为