Study of magnetic toroidal-ripple-component effect on the fast ion confinement

研究了垂直速度较大的快离子的产生和约束。这种粒子的约束是螺旋装置的关键问题。为了产生快离子（质子），使用离子回旋频率范围（ICRF）加热。研究了Heliotron-J磁场中环形波纹分量（起伏）对起伏控制的影响，在高起伏位形下，用电荷交换粒子分析仪测量了能量大于30 keV的快离子，并进行了二维视线扫描，研究了快离子在环面上的分布。通过与其它几种颠簸情况下的结果比较，证实了高颠簸情况下的约束性能较好。用蒙特-卡罗方法编制的数值程序可以部分地再现高起伏下快离子的良好产生和约束特性。

The production and confinement of fast ions which have large perpendicular velocity have been studied. The confinement of such particles is a key issue of the helical devices. For the production of fast ions (protons), ion cyclotron range of frequencies (ICRF) heating is used. The effect of the toroidal ripple component (bumpiness) is examined in the Heliotron-J magnetic field, which has flexibility to control bumpiness.In the high bumpiness configuration, the fast ions more than 30 keV were measured by the charge-exchange particle analyzer and two dimensional scan of the line-of-sight was done to investigate distribution of fast ions in the torus. Comparing with the results of the other bumpunesses, the better confinement property was confirmed in the high bumpiness. The numerical code using Monte-Carlo method can be developed and partially reproduced the good production and confinement property of fast ions in the high bumpiness.