Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun
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 emiss...
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-04-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.28.043401 |
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| author | Xing-Heng Wang Guan Shu Hou-Jun Qian Xu-Dong Li Zi-Peng Liu Zeng-Gong Jiang Hao Meng Cao-Cao Xing Qin Zhou Hai-Xiao Deng |
| author_facet | Xing-Heng Wang Guan Shu Hou-Jun Qian Xu-Dong Li Zi-Peng Liu Zeng-Gong Jiang Hao Meng Cao-Cao Xing Qin Zhou Hai-Xiao Deng |
| author_sort | Xing-Heng Wang |
| collection | DOAJ |
| description | 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, it is a critical parameter for the performance of the cw gun. In this paper, we present 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 | Article |
| id | doaj-art-507b0ddb2a2e4c1691d1932ad1456592 |
| institution | DOAJ |
| issn | 2469-9888 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj-art-507b0ddb2a2e4c1691d1932ad14565922025-08-20T03:16:50ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882025-04-0128404340110.1103/PhysRevAccelBeams.28.043401Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gunXing-Heng WangGuan ShuHou-Jun QianXu-Dong LiZi-Peng LiuZeng-Gong JiangHao MengCao-Cao XingQin ZhouHai-Xiao DengThe 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, it is a critical parameter for the performance of the cw gun. In this paper, we present 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.http://doi.org/10.1103/PhysRevAccelBeams.28.043401 |
| spellingShingle | Xing-Heng Wang Guan Shu Hou-Jun Qian Xu-Dong Li Zi-Peng Liu Zeng-Gong Jiang Hao Meng Cao-Cao Xing Qin Zhou Hai-Xiao Deng Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun Physical Review Accelerators and Beams |
| title | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun |
| title_full | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun |
| title_fullStr | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun |
| title_full_unstemmed | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun |
| title_short | Experimental demonstration of dark current mitigation by an over-inserted plug in a normal conducting very-high-frequency gun |
| title_sort | experimental demonstration of dark current mitigation by an over inserted plug in a normal conducting very high frequency gun |
| url | http://doi.org/10.1103/PhysRevAccelBeams.28.043401 |
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