强激光与粒子束2024，Vol.36Issue(10)：24-35,12.DOI:10.11884/HPLPB202436.240148
热辐射对行波管阴极温度的影响
Influence of thermal radiation on cathode temperature of traveling wave tubes
摘要
Abstract
The working temperature of the cathode,as the electron source of traveling wave tubes(TWTs),directly impacts the performance,stability and lifespan of TWTs.Since the cathode's temperature cannot be directly measured during TWT operation,it is primarily determined through component temperature measurement and electron gun thermal simulation.Thermal radiation is a significant heat transfer mode in the electron gun and a major factor in heat loss.Therefore,it cannot be ignored in the thermal analysis of the electron gun.The heat loss was quantitatively analyzed,the thermal simulation of cathode-thermal shielding assembly was conducted considering contact thermal resistance and heat loss,establishing a comprehensive thermal radiation boundary.The temperature measurement test data curve of the cathode-thermal shielding assembly was fitted by adjusting the surface emissivity of the parts to obtain its value in high-temperature regions of TWT electron guns.The impact of surface emissivity and heat loss on cathode temperature was analyzed,and the accuracy of obtained emissivity value was verified through a heat equilibrium test of electron gun,and then a more precise distribution cloud map of the electron gun was obtained.The research results show that the surface emissivity of cathode is 0.65 when the temperature is between 950 and 1100℃.Besides,the higher the surface emissivity of electron gun components,the lower the cathode temperature,and the surface emissivity of the cathode cylinder has the greatest impact on the cathode temperature;the higher the temperature,the greater the heat loss of the heater.Without considering heat loss,the simulated cathode surface temperature is 14.4-17.5℃higher.The surface temperature of the cathode obtained by component temperature measurement is 42-62℃higher than that of the entire tube.关键词
行波管/阴极/热辐射/热损耗/发射率Key words
traveling wave tube/cathode/thermal radiation/heat loss/emissivity分类
信息技术与安全科学引用本文复制引用
李延威,李飞,尚新文,肖刘,赵建东,易红霞,舟婕,张明晨,史永康..热辐射对行波管阴极温度的影响[J].强激光与粒子束,2024,36(10):24-35,12.基金项目
国家科技重大专项(E0M2130305) （E0M2130305）
