Abstract:

The filament resistance characters of multipolar cusped field bucket ion source on HL-2A tokamak NBI system was firstly introduced, and the filament steady temperature distribution was calculated with a 1 dimensional numerical model. When arc discharge is off, the filament temperature distribution at different filament current and the corresponding filament resistances are calculated. When the arc discharge is on, with the current exported by the filament electrical source being 120A and the approximation of the plasma sheath layer on the filament surface, the filament temperature distribution and the filament resistance at different arc current are calculated. The limited arc discharge current corresponding thaw of tungsten filament is presented. At last, the brief analysis and discussion of the warp between the calculated results and the experiment measured values were given.

Key words: Ion source filament, Iterative calculation, Filament temperature distribution

摘要：

介绍了HL-2A装置NBI系统的多极会切场桶式离子源灯丝电阻特性的实验结果，运用一维数值模型对灯丝稳态温度分布进行了数值计算。在不起弧时，计算了不同灯丝加热电流下的灯丝温度分布和对应的灯丝电阻。在起弧时，通过灯丝表面的等离子体鞘层近似，计算了灯丝电源输出电流为120A时不同弧流下的灯丝温度分布及灯丝电阻，给出了钨灯丝熔化对应的极限弧放电电流。最后，分析讨论了计算结果与实验测量结果的偏差。

关键词: 离子源灯丝, 迭代计算, 灯丝温度分布