组件与非组件式热阴极的热特性分析
Thermal analysis of assembly and non-assembly cathodes
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摘要: 利用ANSYS软件研究了组件式热阴极与非组件式热阴极在阴极温度分布和启动时间等特性上的异同，并与实验结果进行对比。结果表明：组件与非组件式结构的阴极表面温度分布都十分均匀,组件式阴极钼筒外表面的温差与热子输入功率成正比；组件式阴极的钼筒外温度、阴极温度高于非组件式的，而热子温度明显低于非组件式的，但非组件式阴极启动更快；非组件式阴极通过增加阴极下表面发射率可以显著升高阴极温度，增加热子发射率可以显著降低热子温度，从而热性能也能达到与组件式阴极相近水准。Abstract: This paper compares the temperature distribution and warm up time between assembly cathode heated up by conduction and non-assembly cathode heated by radiation using the thermal analysis module of ANSYS. The results show that both of them have a uniform cathode surface temperature distribution and the temperature difference at the sleeve of assembly cathode is in proportion to the input power of its heater and that compared with the non-assembly cathode, the temperature of assembly cathode is higher at the sleeve and the cathode surface, but markedly lower at the heater. Nevertheless, non-assembly cathode starts faster; moreover, improving the emissivities of the cathode’s undersurface and the heater enables the non-assembly cathode to have thermal performance similar to that of the assem
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Key words:
- assembly cathode /
- heater /
- emissivity /
- temperature distribution /
- warm up time
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