Design of a kilohertz repetition rate, low-emittance S-band photoinjector
Low-emittance photoinjector-enabled cutting-edge scientific instruments, such as free-electron lasers, inverse Compton scattering light sources, and ultrafast electron diffraction, will greatly benefit from the improved repetition rate. In this paper, we proposed a specifically designed S-band radio...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2024-04-01
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| Series: | Frontiers in Physics |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2024.1361909/full |
| _version_ | 1797216985483837440 |
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| author | Tianhui He Lijun Shan Hanbin Wang Dexin Xiao Kui Zhou Peng Li Jianxin Wang Hanxun Xu Zheng Zhou Ming Li Dai Wu |
| author_facet | Tianhui He Lijun Shan Hanbin Wang Dexin Xiao Kui Zhou Peng Li Jianxin Wang Hanxun Xu Zheng Zhou Ming Li Dai Wu |
| author_sort | Tianhui He |
| collection | DOAJ |
| description | Low-emittance photoinjector-enabled cutting-edge scientific instruments, such as free-electron lasers, inverse Compton scattering light sources, and ultrafast electron diffraction, will greatly benefit from the improved repetition rate. In this paper, we proposed a specifically designed S-band radio frequency (RF) photoinjector to obtain low emittance and kilohertz (kHz) high-repetition rates simultaneously. By lowering the gradient, much lower RF power is needed to feed the electron gun, and then the heat problem is much easier to handle. Meanwhile, by optimizing the length of the gun’s first cell from the normal case of 0.6-cell to 0.4-cell, the launch phase and the extraction field are significantly improved, thus ensuring the generation of low-emittance electron beams. In our design, the proposed 1.4-cell RF gun can work effectively under different field gradients ranging from 30 MV/m to 100 MV/m. For a standard case of 60 MV/m, 2.5 MW peak RF power with μs level pulse width is sufficient, thus offering the feasibility of improving the repetition rate to kHz level with a standard 5 MW irradiation klystron. In addition, simulated electron beams with a low emittance of 0.29 mm.mrad@200 pC can be generated by this proposed photoinjector, showing that this high-repetition rate injector holds the potential to deliver high-quality beams comparable to those of state-of-the-art S-band photoinjectors. Combining the merits of low emittance and high-repetition rate, this proposed photoinjector will provide a new possibility for future free-electron laser facilities operating at repetition rates ranging from kHz to tens of kHz. |
| first_indexed | 2024-04-24T11:54:40Z |
| format | Article |
| id | doaj.art-9abfb05e7ff5422ba97e4c92ef894480 |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-04-24T11:54:40Z |
| publishDate | 2024-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-9abfb05e7ff5422ba97e4c92ef8944802024-04-09T05:49:53ZengFrontiers Media S.A.Frontiers in Physics2296-424X2024-04-011210.3389/fphy.2024.13619091361909Design of a kilohertz repetition rate, low-emittance S-band photoinjectorTianhui HeLijun ShanHanbin WangDexin XiaoKui ZhouPeng LiJianxin WangHanxun XuZheng ZhouMing LiDai WuLow-emittance photoinjector-enabled cutting-edge scientific instruments, such as free-electron lasers, inverse Compton scattering light sources, and ultrafast electron diffraction, will greatly benefit from the improved repetition rate. In this paper, we proposed a specifically designed S-band radio frequency (RF) photoinjector to obtain low emittance and kilohertz (kHz) high-repetition rates simultaneously. By lowering the gradient, much lower RF power is needed to feed the electron gun, and then the heat problem is much easier to handle. Meanwhile, by optimizing the length of the gun’s first cell from the normal case of 0.6-cell to 0.4-cell, the launch phase and the extraction field are significantly improved, thus ensuring the generation of low-emittance electron beams. In our design, the proposed 1.4-cell RF gun can work effectively under different field gradients ranging from 30 MV/m to 100 MV/m. For a standard case of 60 MV/m, 2.5 MW peak RF power with μs level pulse width is sufficient, thus offering the feasibility of improving the repetition rate to kHz level with a standard 5 MW irradiation klystron. In addition, simulated electron beams with a low emittance of 0.29 mm.mrad@200 pC can be generated by this proposed photoinjector, showing that this high-repetition rate injector holds the potential to deliver high-quality beams comparable to those of state-of-the-art S-band photoinjectors. Combining the merits of low emittance and high-repetition rate, this proposed photoinjector will provide a new possibility for future free-electron laser facilities operating at repetition rates ranging from kHz to tens of kHz.https://www.frontiersin.org/articles/10.3389/fphy.2024.1361909/fullphotoinjectorRF gunLINACelectron beamrepetition rateemittance |
| spellingShingle | Tianhui He Lijun Shan Hanbin Wang Dexin Xiao Kui Zhou Peng Li Jianxin Wang Hanxun Xu Zheng Zhou Ming Li Dai Wu Design of a kilohertz repetition rate, low-emittance S-band photoinjector Frontiers in Physics photoinjector RF gun LINAC electron beam repetition rate emittance |
| title | Design of a kilohertz repetition rate, low-emittance S-band photoinjector |
| title_full | Design of a kilohertz repetition rate, low-emittance S-band photoinjector |
| title_fullStr | Design of a kilohertz repetition rate, low-emittance S-band photoinjector |
| title_full_unstemmed | Design of a kilohertz repetition rate, low-emittance S-band photoinjector |
| title_short | Design of a kilohertz repetition rate, low-emittance S-band photoinjector |
| title_sort | design of a kilohertz repetition rate low emittance s band photoinjector |
| topic | photoinjector RF gun LINAC electron beam repetition rate emittance |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2024.1361909/full |
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