Hybrid-PIC Simulation of LaB6 Hollow Cathode Self-Heating Characteristics
Hybrid-PIC Simulation of LaB6 Hollow Cathode Self-Heating Characteristics
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DOI：
10.2322/tjsass.62.11
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发表时间：
2019
影响因子：
1.1
通讯作者：
K. Kubota;Y. Oshio;Hiroki Watanabe;Shinatora Cho;Y. Ohkawa;I. Funaki
中科院分区：
文献类型：
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作者：
K. Kubota;Y. Oshio;Hiroki Watanabe;Shinatora Cho;Y. Ohkawa;I. Funaki
采用混合PIC模型对LaB 6空心阴极的等离子体湍流和自加热特性进行了数值模拟。在放电电流为30 A，质量流率为3 mg / s的条件下，研究了发射极温度分布和异常电阻率模型中的模型参数对等离子体质量流和能量流的影响。在模拟中，放电电压被固定在预定值，并且最大发射极温度被周期性地调整以保持放电电流恒定。结果表明，该模型预测的保持器击穿电压的精度在20%以内。结果表明，发射极温度升高的主要原因是离子轰击和伴随的复合能，当发射极温度分布变得均匀时，发射极最高温度可以保持较低。研究还表明，当异常电阻率增加时，发射极的热输入会减少。
Numerical simulation of plasma fl ow and the self-heating characteristics of a LaB 6 hollow cathode were performed using a hybrid-PIC model. For a discharge current of 30 A and mass fl ow rate of 3 mg / s, the in fl uences of an emitter temperature pro fi le and model parameter included in an anomalous resistivity model on the plasma fl ow and energy fl ux were investigated. In the simulation, the discharge voltage was fi xed at a predetermined value and the maximum emitter temperature was periodically adjusted to keep the discharge current constant. The results show that the present model predicts the keeper fl oating voltage within an accuracy of 20%. It is found that the main reason for the emitter temperature to rise is due to ion bombardment and accompanying recombination energy, and that the maximum emitter temperature can be kept lower as the emitter temperature pro fi le becomes uniform. It is also shown that thermal input into the emitter is decreased when anomalous resistivity increases.