Author: Zeng, L.
Paper Title Page
MOPB026 Physical Design for EEHG Beamlines at S3FEL 55
 
  • X.F. Wang
    Institute of Advanced Science Facilities, Shenzhen, People’s Republic of China
  • C. Feng, Z. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • X.M. Li, J.T. Sun, Y. Yu
    DICP, Dalian, Liaoning, People’s Republic of China
  • Y.F. Liang, X.M. Yang, H. Yi, L. Zeng, W.Q. Zhang
    IASF, Shenzhen, Guangdong, People’s Republic of China
  
  Funding: Work supported by the National Key R&D Program of China (Grant No.2018YFE0203000) and the National Natural Science Foundation of China (Grant No.22288201).
The proposed Shenzhen Superconducting Soft X-Ray Free-electron Laser (S3FEL) aims at generating FEL pulses from 1 nm to 30 nm. At phase-I, two undulator beamlines work at ehco-enable harmonic generation (EEHG) principle. The two undulators will cover the spectral ranges 2.3-15 nm (~83-539 eV) and 5-30 nm (~41-248 eV), respectively, when receiving electrons from 2.5 GeV superconducting linac. However, the generated FEL radiation is sensitive to various electron beam properties, e.g., its energy profile influenced by collective effects such as Coherent Synchroton Radiation (CSR), especially at high harmonics. To generate intense full coherent FEL radiation at ultra-short wavelength, a novel technique of EEHG cascaded harmonic lasing method is also considered. Physical design and FEL performance are described in this paper. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB026  
About • Received ※ 10 July 2023 — Revised ※ 11 July 2023 — Accepted ※ 18 July 2023 — Issued ※ 04 October 2024
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MOPB029 Multi-bunch Operation Mode for Simultaneously Serving SASE and Seeding FEL Beamlines 66
 
  • X.F. Wang
    Institute of Advanced Science Facilities, Shenzhen, People’s Republic of China
  • X.M. Li, J.T. Sun, X.M. Yang, Y. Yu, W.Q. Zhang
    DICP, Dalian, Liaoning, People’s Republic of China
  • Y.F. Liang, X.M. Yang, H. Yi, L. Zeng, W.Q. Zhang
    IASF, Shenzhen, Guangdong, People’s Republic of China
  
  Modern free-electron laser (FEL) facilities are de-signed to simultaneously serve multiple undulator lines to provide x-ray pulses with high peak power and tunable wavelengths. To satisfy different scientific demands, it is preferred to make the separate undulator lines work under different FEL schemes, such as the self-amplified spontaneous emission (SASE) scheme and the echo-enabled harmonic generation (EEHG) scheme. However, different FEL schemes have differ-ent requirements on the beam longitudinal distribu-tion. Here, we propose to use multiple bunches to sim-ultaneously serve the undulator lines and put the bunches at different acceleration phase to change the bunch length with two compressor chicanes. The ac-celeration phase for each bunch is varied by adjusting the time delays of the photocathode drive laser pulses with the accelerator settings unchanged. The start-to-end simulation demonstrates that a fs bunch with high peak current can be produced to serve the SASE line while a bunch with hundred-of-fs length and uniform current distribution can be produced to serve the EEHG line. The FEL performances are simulated and discussed.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB029  
About • Received ※ 25 June 2023 — Revised ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 07 September 2024
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