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Proceedings Paper

New type x-ray photocathode
Author(s): Xiuping Sun; Yuling Feng; KeCheng Feng
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Paper Abstract

We increase the mass and thickness of CsI film on the base of CsI/MCP (micochannel plate) reflection mode photocathode properly. A part of CsI material is evaporated into 1-1 .5 diameter depth of the channel; another part is coated onto the input surface of MCP. Thus the transmission-reflection combined new type photocathode is formed. When x-rays irradiate the cathode, they penetrate into the coated layer and cause the photoelectron emission, then the rays get into the layer on the walls of MCP, continue to interact with CsI, and produce photoelectrons again. We calculate the quantum efficiency ofthe new type on theory. We also compare the transmission-reflection mode cathode with the reflection mode cathode through experiments of the output current character. The results of the experiment indicate that, the output current of the new type is increased two times than that of CsI/MCP reflection mode photocathode under the same condition and so the quantum effective is increased.

Paper Details

Date Published: 30 August 2002
PDF: 4 pages
Proc. SPIE 4924, Holography, Diffractive Optics, and Applications, (30 August 2002); doi: 10.1117/12.481488
Show Author Affiliations
Xiuping Sun, Changchun Univ. of Science and Technology (China)
Yuling Feng, Changchun Univ. of Science and Technology (China)
KeCheng Feng, Changchun Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 4924:
Holography, Diffractive Optics, and Applications
Dahsiung Hsu; Jiabi Chen; Yunlong Sheng, Editor(s)

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