大直径钪酸盐阴极发射特性

为获得kA级热发射电子束，研制了直径为100 mm钪酸盐热阴极组件，并建立了适应大面积热阴极实验环境的2 MV 注入器试验平台。实验在二极管真空3.7×10-5 Pa、二极管电压1.95 MV、脉宽120 ns(FWHM)、阴极温度1 120 ℃时，获得最大收集电流1 038 A，发射电流密度约13 A/cm2。实验结果表明，工作状态下阴极发射能力与激活温度、系统真空度关系密切。

Abstract

In order to acquire Kilo-Ampere level emission current,a 100 mm diameter scandate cathode was manufactured. A 2 MV injector test stand was established with a large area thermionic cathode. A 1 038 A emission current was produced with a diode voltage 1.95 MV, pulse width 120 ns(FWHM), cathode temperature 1 120 ℃.The emission current density was 13 A/cm2. The results indicate that the ability of cathode emission relies on diode vacuum and cathode activation temperature.

参考文献

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杨安民, 夏连胜, 王辉, 余志强, 李季, 石金水, 张篁, 刘星光, 刘云龙, 潘海峰. 大直径钪酸盐阴极发射特性[J]. 强激光与粒子束, 2011, 23(6): 1621. Yang Anmin, Xia Liansheng, Wang Hui, Yu Zhiqiang, Li Ji, Shi Jinshui, Zhang Huang, Liu Xingguang, Liu Yunlong, Pan Haifeng. Emission characteristic of scandate cathode with large diameter[J]. High Power Laser and Particle Beams, 2011, 23(6): 1621.

大直径钪酸盐阴极发射特性

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