关键词: 离子源灯丝, 迭代计算, 灯丝温度分布

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