Surface photoemission in a high-brightness electron beam radio frequency gun

被引：32
|
作者：
Qian, H. J. [1 ,2 ]
Murphy, J. B. [1 ]
Shen, Y. [1 ]
Tang, C. X. [2 ]
Wang, X. J. [1 ]
机构：
[1] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA
[2] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 25期
关键词：
MAGNESIUM; ROUGHNESS;
D O I：
10.1063/1.3531561
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report the experimental characterization of high-brightness electron beam generation from a magnesium (Mg) photocathode. Both the quantum efficiency (QE) and the thermal emittance of an Mg cathode are experimentally investigated. The measured QE similar to 0.2% is the highest reported for a metal cathode. We observed no change in the Mg cathode thermal emittance as the QE varies from 0.015% to 0.15%. The upper-limit of the thermal emittance, 0.5 mm mrad, is about 50% lower than the theoretical prediction. Our results demonstrated the feasibility of having a high QE and a low thermal emittance simultaneously for a robust metal photocathode. c 2010 American Institute of Physics. [doi:10.1063/1.3531561]
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页数：3
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