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Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting VHF gun

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arxiv 2411.01754 v1 pith:N4QX5K5U submitted 2024-11-04 physics.acc-ph

X.-H. Wang , G. Shu , H. Qian , X. Li , Z. Liu , Z. Jiang , H. Meng , C. Xing
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Q. Zhou H. Deng
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classification physics.acc-ph
keywords currentdarkcathodeover-insertedreductionacceleratingaccelerationalong
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The room temperature continuous wave (CW) very-high-frequency (VHF) gun is one of the candidates for the electron gun of the high-repetition-rate free-electron lasers (FELs). The VHF gun operates with a cathode gradient of ~ 20 MV/m and an accelerating voltage of ~ 750 kV. The gun dark current emission leads to beam loss along the FEL machine, therefore is a critical parameter for the performance of the CW gun. In this paper, we presents a systematic study of the dark current reduction of the VHF gun, including cathode region optimizations, dark current tracking simulations and measurements. Over-inserted cathode plugs were tested in two VHF guns of different acceleration gap sizes, and both demonstrated significant dark current reduction ratios of more than two orders of magnitude.

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