Large Area Thermionic Cathode and Its Prilimiary Experimental Results  

大面积热阴极系统设计及初步实验结果

作　　者：杨安民[1] 夏连胜[1] 张篁[1] 张开志[1] 石金水[1] 邓建军[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《Chinese Physics C》2008年第z1期286-288,共3页中国物理C（英文版）

摘　　要：A 2MeV thermionic cathode test stand was established to meet the requirement of the large area thermionic cathode system.A 100ram in diameter type'B'thermionic dispenser cathode was developed.A 1000A emission current was produced at the voltage of the diode about 1.8MV,the pulse width about 90ns(FWHM),and the cathode temperature about 1350℃.The emission current density is 12A/cm^2.The results indicate that a large area thermionic cathode which produces high quality and high current electron beams is visible.The results also indicate that the ability of cathode emission relies on the diode-vacuum and cathode-temperature.建立了能满足大面积热阴极系统需要的2MeV热阴极实验平台,并配合研制了直径为100mm的B型储备式热阴极.在二极管电压为1.8MV、脉宽90ns(FWHM)、阴极工作温度为1350℃情况下,利用法拉第筒获得了1000A的发射电流,发射电流密度约12A/cm^2.实验结果表明,利用大面极热阴极获得高亮度强流电子束在工程上是可以实现的.实验结果也表明,阴极发射能力强烈依靠于二极管真空和阴极工作温度.

关 键 词：LINAC DIODE thermionic dispenser cathode current density 

分 类 号：TN78[电子电信—电路与系统]