Secondary electron emission characteristics of graphene films with copper substrate

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Jie Wang, Yong Wang, Yanhui Xu, Yuxin Zhang, Bo Zhang and Wei Wei. Secondary electron emission characteristics of graphene films with copper substrate[J]. Chinese Physics C, 2016, 40(11): 117003. doi: 10.1088/1674-1137/40/11/117003
Jie Wang, Yong Wang, Yanhui Xu, Yuxin Zhang, Bo Zhang and Wei Wei. Secondary electron emission characteristics of graphene films with copper substrate[J]. Chinese Physics C, 2016, 40(11): 117003.  doi: 10.1088/1674-1137/40/11/117003 shu
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Received: 2016-03-17
Revised: 2016-07-10
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    Supported by the National Natural Science Foundation of China (11475166) National Natural Science Foundation of China (11205155) and National Natural Science Foundation of China (11575214)

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Secondary electron emission characteristics of graphene films with copper substrate

    Corresponding author: Yong Wang,
    Corresponding author: Bo Zhang,
  • 1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
Fund Project:  Supported by the National Natural Science Foundation of China (11475166) National Natural Science Foundation of China (11205155) and National Natural Science Foundation of China (11575214)

Abstract: For modern and future circular accelerators, especially high-intensity proton synchrotrons or colliders, the electron cloud effect is a key issue. So, in order to reduce the electron cloud effect, exploring very low secondary electron yield (SEY) material or coating used in vacuum tubes becomes necessary. In this article, we studied the SEY characteristics of graphene films with different thicknesses which were deposited on copper substrates using chemical vapor deposition. The SEY tests were done at temperatures of 25℃ and vacuum pressure of (2-6)×10-9 torr. The properties of the deposited graphene films were investigated by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The SEY curves show that the number of graphene layers has a great effect on the SEY of graphene films. The maximum SEY of graphene films decreases with the increase of the number of layers. The maximum SEY of 6-8 layers of graphene film is 1.25. These results have a great significance for next-generation particle accelerators.

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