A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice
BackgroundX-ray free electron lasers (FEL), especially fully coherent femtosecond free-electron laser pulses, are widely used in numerous fields.PurposeThis study aims to propose a new principle for generating fully coherent femtosecond X-ray pulse based on the Shanghai soft X-ray Free Electron Lase...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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Science Press
2021-07-01
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| Series: | He jishu |
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| Online Access: | http://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2021.hjs.44.070101&lang=zh |
| _version_ | 1811169671187005440 |
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| author | GAO Zhangfeng YAN Jiawei DENG Haixiao LIU Bo WANG Dong |
| author_facet | GAO Zhangfeng YAN Jiawei DENG Haixiao LIU Bo WANG Dong |
| author_sort | GAO Zhangfeng |
| collection | DOAJ |
| description | BackgroundX-ray free electron lasers (FEL), especially fully coherent femtosecond free-electron laser pulses, are widely used in numerous fields.PurposeThis study aims to propose a new principle for generating fully coherent femtosecond X-ray pulse based on the Shanghai soft X-ray Free Electron Laser User Facility (SXFEL-UF).MethodsThe principle was based on fresh-slice technique. First of all, the electron beam was kicked transversely to get a time-related transverse tilt. Then, the sub-10-femtosecond bunch was achieved because of the spatiotemporal synchronization effect of the seed laser modulation. The FEL pulse duration was even shorter because of harmonic lasing. In the cascaded high-gain harmonic generation (HGHG) mode, the laser generated by the beam tail modulated the beam head in the second stage to reach higher harmonics, while in the echo-enabled harmonic generation (EEHG) mode, the same part of the electron beam was modulated twice. The influence of emittance and energy chirp of the electron beam on the scheme was analyzed, and the instability caused by transverse position jitter and energy jitter of the chirped beam was evaluated.Results & ConclusionsIn the cascaded HGHG mode of SXFEL-UF, an X-ray pulse with peak power as high as 3 GW and pulse duration (FWHM) as short as 3.3 fs is obtained in the 3D simulation at 45th harmonic, and the relationship between the pulse duration and the transverse deflection of the beam is verified. The result of the 3D simulation for the EEHG mode is similar. The scheme is also explored to generate linearly polarized femtosecond pulse at 6 nm and circularly polarized femtosecond pulse at 3 nm simultaneously by means of the elliptically polarized undulator (EPU) afterburner. |
| first_indexed | 2024-04-10T16:47:09Z |
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| id | doaj.art-f6cdab16d0484a52a0dedf49965a9c77 |
| institution | Directory Open Access Journal |
| issn | 0253-3219 |
| language | zho |
| last_indexed | 2024-04-10T16:47:09Z |
| publishDate | 2021-07-01 |
| publisher | Science Press |
| record_format | Article |
| series | He jishu |
| spelling | doaj.art-f6cdab16d0484a52a0dedf49965a9c772023-02-08T00:42:02ZzhoScience PressHe jishu0253-32192021-07-014471810.11889/j.0253-3219.2021.hjs.44.0701010253-3219（2021）07-0001-08A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-sliceGAO Zhangfeng0YAN Jiawei1DENG Haixiao2LIU Bo3WANG Dong4Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaShanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaShanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaShanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaShanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaBackgroundX-ray free electron lasers (FEL), especially fully coherent femtosecond free-electron laser pulses, are widely used in numerous fields.PurposeThis study aims to propose a new principle for generating fully coherent femtosecond X-ray pulse based on the Shanghai soft X-ray Free Electron Laser User Facility (SXFEL-UF).MethodsThe principle was based on fresh-slice technique. First of all, the electron beam was kicked transversely to get a time-related transverse tilt. Then, the sub-10-femtosecond bunch was achieved because of the spatiotemporal synchronization effect of the seed laser modulation. The FEL pulse duration was even shorter because of harmonic lasing. In the cascaded high-gain harmonic generation (HGHG) mode, the laser generated by the beam tail modulated the beam head in the second stage to reach higher harmonics, while in the echo-enabled harmonic generation (EEHG) mode, the same part of the electron beam was modulated twice. The influence of emittance and energy chirp of the electron beam on the scheme was analyzed, and the instability caused by transverse position jitter and energy jitter of the chirped beam was evaluated.Results & ConclusionsIn the cascaded HGHG mode of SXFEL-UF, an X-ray pulse with peak power as high as 3 GW and pulse duration (FWHM) as short as 3.3 fs is obtained in the 3D simulation at 45th harmonic, and the relationship between the pulse duration and the transverse deflection of the beam is verified. The result of the 3D simulation for the EEHG mode is similar. The scheme is also explored to generate linearly polarized femtosecond pulse at 6 nm and circularly polarized femtosecond pulse at 3 nm simultaneously by means of the elliptically polarized undulator (EPU) afterburner.http://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2021.hjs.44.070101&lang=zhx-rayfemtosecond pulseenergy chirpfresh-slicecircular polarization |
| spellingShingle | GAO Zhangfeng YAN Jiawei DENG Haixiao LIU Bo WANG Dong A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice He jishu x-ray femtosecond pulse energy chirp fresh-slice circular polarization |
| title | A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice |
| title_full | A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice |
| title_fullStr | A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice |
| title_full_unstemmed | A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice |
| title_short | A proposal for generating fully coherent X-ray FEL with femtosecond pulse based on fresh-slice |
| title_sort | proposal for generating fully coherent x ray fel with femtosecond pulse based on fresh slice |
| topic | x-ray femtosecond pulse energy chirp fresh-slice circular polarization |
| url | http://www.hjs.sinap.ac.cn/thesisDetails#10.11889/j.0253-3219.2021.hjs.44.070101&lang=zh |
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