摘要
介绍了一种用于管状电子束发射的大面积LaB6阴极电子源,其阴极发射面积为115 mm2,LaB6发射体用钼作基底,在LaB6与钼之间用耐高温的碳化物粘合剂填充以防止LaB6与钼发生反应。采用电子束轰击的方式加热LaB6发射体,当阴极温度为1 873 K时,加热功率为173 W,直流发射电流密度达到40A/cm2。与用石墨加热LaB6发射体相比,该电子源加热功率降低了66%。阴极在室温下反复暴露于大气后其发射性能稳定。
In this paper we reported a ring shaped LaB6 cathode with a large emission area of 115 mm^2. The direct emission current density of the LaB6 was more than 40 A/cm^2 when the temperature of LaB6 was 1 873 K. The heating power for the LaB6 cathode was only 173 W when the temperature of LaB6 cathode was as high as 1 873 K, in which an electron beam source was employed as the heater. The heating power decreased 66%, compared to that when the conversional graphite acted as the heater. It presented excellent emitting performance even after the cathode was exposed to the air many times.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2006年第2期305-308,共4页
High Power Laser and Particle Beams
基金
中国工程物理研究院科技攻关项目资助课题
关键词
LaB6阴极
电子轰击
强流电子源
功函数
阳极耗散功率
LaB6 cathodes Electron bombing
Intense emitting current sources Work functions Dissipation power of anode
