| 大面积环状LaB6阴极 |
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| 引用本文： | 林祖伦,曹贵川,张义德,陈泽祥,祁康成.大面积环状LaB6阴极[J].强激光与粒子束,2006,18(2):305-308. |
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| 作者姓名： | 林祖伦 曹贵川 张义德 陈泽祥 祁康成 |
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| 作者单位： | 电子科技大学 光电信息学院， 成都 610054 |
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| 基金项目： | 中国工程物理研究院科技攻关项目 |
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| 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40 A/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。
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| 关 键 词： | LaB6阴极 电子轰击 强流电子源 功函数 阳极耗散功率 |
| 文章编号： | 1001-4322（2006）02-0305-04 |
| 收稿时间： | 2005-06-27 |
| 修稿时间： | 2005-12-22 |
Large area ring-shaped LaB6 cathode |
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| LIN Zu-lun,CAO Gui-chuan,ZHANG Yi-de,CHEN Ze-xiang,QI Kang-cheng.Large area ring-shaped LaB6 cathode[J].High Power Laser and Particle Beams,2006,18(2):305-308. |
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| Authors: | LIN Zu-lun CAO Gui-chuan ZHANG Yi-de CHEN Ze-xiang QI Kang-cheng |
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| Institution: | School of Opto-electronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China |
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| Abstract: | In this paper we reported a ring-shaped LaB_6 cathode with a large emission area of 115 mm~2.The direct emission current density of the LaB_6 was more than 40 A/cm~2 when the temperature of LaB_6 was 1 873 K.The heating power for the LaB_6 cathode was only 173 W when the temperature of LaB_6 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. |
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| Keywords: | LaB_6 cathode Electron bombing Intense emitting current source Work function Dissipation power of anode |
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