Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting VHF gun
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913570720055296 |
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| author | Wang, X. -H. Shu, G. Qian, H. Li, X. Liu, Z. Jiang, Z. Meng, H. Xing, C. Zhou, Q. Deng, H. |
| author_facet | Wang, X. -H. Shu, G. Qian, H. Li, X. Liu, Z. Jiang, Z. Meng, H. Xing, C. Zhou, Q. Deng, H. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_01754 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting VHF gun Wang, X. -H. Shu, G. Qian, H. Li, X. Liu, Z. Jiang, Z. Meng, H. Xing, C. Zhou, Q. Deng, H. Accelerator Physics 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. |
| title | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting VHF gun |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2411.01754 |