Thermal emittance and response time measurements of negative electron affinity photocathodes

被引：99

作者：

Bazarov, Ivan V. ^{[1
]}

Dunham, Bruce M. ^{[1
]}

Li, Yulin ^{[1
]}

Liu, Xianghong ^{[1
]}

Ouzounov, Dimitre G. ^{[1
]}

Sinclair, Charles K. ^{[1
]}

Hannon, Fay ^{[2
]}

Miyajima, Tsukasa ^{[3
]}

机构：

[1] Cornell Univ, Lab Elementary Particle Phys, Ithaca, NY 14853 USA

[2] Univ Lancaster, Lancaster, England

[3] Natl Lab High Energy Phys, KEK, Photon Factory, Tsukuba, Ibaraki 305, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2838209

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The thermal emittance and temporal response of a photocathode set an upper limit on the maximum achievable electron beam brightness from a photoemission electron source, or photoinjector. We present measurements of these parameters over a broad range of laser wavelength for two different negative electron affinity (NEA) photocathodes. The thermal emittance of NEA GaAs and GaAsP has been measured by two techniques-a measurement of the beam size downstream from a solenoid, whose strength was varied, and a double slit transmission measurement-for different laser spot sizes and shapes. The effect of space charge on the beam spot size allows a good estimation of the photoemission response time from these cathodes. Both cathodes show a subpicosecond response for laser wavelengths shorter than 520 nm. (C) 2008 American Institute of Physics.

引用

页数：8

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