摘要
关于等离子体放电优化控制问题,由于在托卡马克等离子体放电中,等离子体击穿的条件是获得合适的环电压以及尽可能大的零场区。较好的零场只有通过调节极向场线圈电流才能实现,同时EAST极向场系统采用了一体化的设计,但还没有专门的补偿线圈来控制放电初期有较好的零场,根据要求计算零场区结果应与实际实验结果相符。为解决上述问题,提出调节极向场线圈电流以获得较好的零场区,使等离子体顺利击穿。根据提出的磁通环、磁探针等测量信号,计算出了等离子体击穿的零场区、击穿前后的涡流变化及分布,并利用高速CCD记录等离子体放电的击穿过程来验证结果的准确性,取得了与实验一致的结果,为EAST正常放电提供了很好的参考价值。
In the process of Tokamak plasma discharge,the plasma breakdown needs proper loop voltage and a large null field in the vacuum vessel.A good null field can only be acquired by adjusting the poloidal field（PF） coils current.The integrated design is applied for the PF system,and there are not special coils for compensating to get an appropriate null field.How to calculate the null field to make sure that the numerical results can prove a series of phenomena in the experiments and agree well with the experimental results,becomes an important factor for plasma breakdown.The paper calculated the null field,the eddy current around breakdown and its distribution based on the flux loop,magnetic probe and other measure signals.The numerical results were proved by using high speed CCD to record the whole process of plasma discharge and agree well with the experimental results.It lays a foundation for feedback control of plasma.
出处
《计算机仿真》
CSCD
北大核心
2012年第4期392-396,共5页
Computer Simulation
基金
国家973资助项目(2008CB717807)
ITER国内配套项目(2010GB108004)
关键词
托卡马克
击穿
零场区
涡流
Tokamak
Breakdown
Null field
Eddy current
