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为了评估阴极热子失效对阴极寿命的影响,在考虑空心阴极热子加热功率和蒸发速率的基础上,利用建模分析的方法研究了阴极热子阻值退化过程及热子初始半径对寿命的影响,分析了阴极热子寿命评估的误差传播特性和基于阻值变化的阴极热子寿命评估方法。结果表明阴极热子退化过程是一种典型的失稳过程;阴极热子寿命对初始半径的敏感度较高,热子半径每减少2μm,寿命减少约50%;热子初始半径误差在退化过程中会被剧烈放大,初始值的微小标准差经过这一发散过程后标准差从0.046增大到0.083,高于初始值近两倍,在空心阴极的加速寿命评估中恒流工作模式的稳定性较差。
In order to evaluate the effect of cathode thermal failure on the life of cathode, based on the analysis of the heating power and evaporation rate of the hollow cathode, the degradation of cathode thermal resistance and the initial radius of thermal electron lifetime , The error propagation characteristics of the cathode thermal life assessment and the evaluation method of the cathode thermal lifetime based on the change of the resistance are analyzed. The results show that the degradation process of cathodes is a typical instability process. The lifetime of cathodes is sensitive to the initial radius. The reduction of the thermal radius by about 50% Will be greatly enlarged, the standard deviation of the initial value of the standard deviation after this divergence process increased from 0.046 to 0.083, higher than the initial nearly doubled in the hollow cathode accelerated life assessment of constant current mode of operation stability Poor.