New type x-ray photocathode

Xiuping Sun; Yuling Feng; KeCheng Feng

doi:10.1117/12.481488

30 August 2002 New type x-ray photocathode

Xiuping Sun, Yuling Feng, KeCheng Feng

Proceedings Volume 4924, Holography, Diffractive Optics, and Applications; (2002) https://doi.org/10.1117/12.481488
Event: Photonics Asia, 2002, Shanghai, China

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.

Citation Download Citation

Xiuping Sun, Yuling Feng, and KeCheng Feng "New type x-ray photocathode", Proc. SPIE 4924, Holography, Diffractive Optics, and Applications, (30 August 2002); https://doi.org/10.1117/12.481488

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