High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode | |
Dai, Jun3; Ding, Yikun3; Ruan, Cunjun2,3; Xu, Xiangyan1; Liu, Hulin1 | |
刊名 | ELECTRONICS
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2020-12 | |
卷号 | 9期号:12 |
关键词 | continuous high current density emission nonuniformity emission nonlinear emission built-in electric field |
ISSN号 | 2079-9292 |
DOI | 10.3390/electronics9121991 |
产权排序 | 3 |
英文摘要 | High photocurrent density cathodes that enable small cross-section electron beams are required for high-power terahertz vacuum devices. Multi-alkali antimonide photocathodes may be well suited for generating sub-mm electron beam sources. This paper involves the repeatability, stability, uniformity, and linearity experiments of the multi-alkali antimonide photocathodes electron emission operations under a continuous-wave 450 nm laser with a bias voltage of 5000 V. The effect of heat, electric contact, and cathode surface roughness to emission characterizations is analyzed. The methods to maintain the high-current-density emission and avoid the fatigue of the photocathode are verified. The emission can be repeated with increased optical power. The stable photocurrent density of near 1 A/cm(2) and maximum current density of near 1.43 A/cm(2) is recorded. The continuous photocurrent density is significantly improved compared to the current density reported in traditional applications. It is found that the current curves measuring at different areas of the photocathode differ greatly after the laser power of 800 mW. The increase in current for some areas may be attributed to the conductive current caused by built-in electric fields between the emission rough area and its adjacent areas. |
语种 | 英语 |
出版者 | MDPI |
WOS记录号 | WOS:000602078800001 |
内容类型 | 期刊论文 |
源URL | [http://ir.opt.ac.cn/handle/181661/94220] ![]() |
专题 | 条纹相机工程中心 |
通讯作者 | Ruan, Cunjun; Xu, Xiangyan |
作者单位 | 1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China 2.Beihang Univ, Beijing Key Lab Microwave Sensing & Secur Applica, Beijing 100191, Peoples R China 3.Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China |
推荐引用方式 GB/T 7714 | Dai, Jun,Ding, Yikun,Ruan, Cunjun,et al. High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode[J]. ELECTRONICS,2020,9(12). |
APA | Dai, Jun,Ding, Yikun,Ruan, Cunjun,Xu, Xiangyan,&Liu, Hulin.(2020).High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode.ELECTRONICS,9(12). |
MLA | Dai, Jun,et al."High Photocurrent Density and Continuous Electron Emission Characterization of a Multi-Alkali Antimonide Photocathode".ELECTRONICS 9.12(2020). |
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