A three dimensional bounce-averaged Fokker-Planck(FP) numerical code has been newly developed based on fully implicit iterative solving method,and relativistic effect is also included in the code.The code has been tested against various benchmark cases:Ohmic conductivity in the presence of weak Ohmic electric field,runaway losses of electrons in the presence of strong Ohmic electric field,lower hybrid current drive and electron cyclotron current drive via two- or three-dimensional simulation.All the test cases run fast and correctly during calculations.As a result,the code provides a set of powerful tools for studying radio frequency wave heating and current drive in tokamak plasmas.
采用自主编写的程序HWAP(helicon wave at plasma)模拟了双鞍型天线与均匀柱状螺旋波等离子体相互作用时耦合距离对功率沉积的影响。模拟结果表明:1)在一定实验条件下,双鞍型天线发射的波在等离子体中同时激发螺旋波和Trivelpiece-Gould(TG)波,控制天线耦合距离可改变TG波在等离子体边界附近的能量沉积分布;2)当天线耦合距离在一定范围内变化时(15.0~30.0 cm),耦合距离的大小能影响螺旋波和TG波在能量沉积过程中起的主导作用;3)当天线放置在等离子体中时,波在等离子体中沉积的总功率随耦合距离的增加而减少,当天线放置在等离子体边界和装置外壁之间时,总功率沉积先增加后减少,存在一个最佳耦合距离使功率沉积最大。
