Author: Liu, B.
Paper Title Page
MOA05
First Lasing at SXFEL  
 
  • Z.T. Zhao, M. Gu, Q. Gu, Y.B. Leng
    SSRF, Shanghai, People’s Republic of China
  • H.X. Deng, B. Liu, D. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • G.P. Fang, L. Yin, M. Zhang
    SINAP, Shanghai, People’s Republic of China
 
  Shanghai soft X-ray free-electron laser (SXFEL) started its construction in December of 2014. After years of effort, first lasing at 8.8 nm with designed cascading mode is finally achieved in 2019. The commissioning progress and recent results will be reported.  
slides icon Slides MOA05 [9.952 MB]  
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TUP063 Physical Design and FEL Performance Study for FEL-III Beamline of SHINE 199
 
  • N. Huang
    SINAP, Shanghai, People’s Republic of China
  • H.X. Deng, B. Liu, D. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
 
  The first hard X-ray free electron laser (XFEL) facility in China, the Shanghai High-Repetition-Rate XFEL and Extreme Light Facility (SHINE), is under construction, which allows for generating X-ray pulses in the photon energy range from 3 keV to 25 keV. To produce X-ray pulses with photon energy up to 25 keV, FEL-III undulator line of SHINE employs superconducting undulators. However, the smaller gap of the superconducting undulator poses serious wakefield effect reducing the FEL power, compared to the normal planar undulator. For a setup design optimization, the design and performance of the FEL-III undulator line are presented using start-to-end beam simulations at self-amplified spontaneous emission (SASE) and self-seeding mode. The wakefield impact on FEL performance is then investigated. A linear undulator tapering technique is adopted for recovering the FEL power to the non-wakefield level.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-TUP063  
About • paper received ※ 19 August 2019       paper accepted ※ 28 August 2019       issue date ※ 05 November 2019  
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TUP088 Numerical Simulations for Generating Fully Coherent Soft X-Ray Free Electron Lasers With Ultra-Short Wavelength 258
 
  • K.S. Zhou, H.X. Deng, B. Liu, D. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
 
  For the fully coherent, ultra-short and high power soft X-rays are becoming key instruments in many different research fields, such as biology, chemistry or physics. However, it’s hard to generate this kind of advanced light source by the conventional lasers, especially for the soft X-rays with ultra-short wavelength because of no suitable reflectors. The external seeded free electron laser (FEL) is considered as one feasible method. Here, we give an example to generate highly temporal coherent soft X-rays with the wavelength 1 nm by the two-stage cascaded schemes. EEHG scheme is used as the first-stage while the HGHG scheme is used as the second-stage.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-TUP088  
About • paper received ※ 20 August 2019       paper accepted ※ 22 October 2019       issue date ※ 05 November 2019  
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WEP058 Drive Laser Temporal Shaping Techniques for Shanghai Soft X-Ray Free Electron Laser 466
 
  • X.T. Wang, T. Lan, M. Zhang, W.Y. Zhang
    SINAP, Shanghai, People’s Republic of China
  • L. Feng, B. Liu
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • C.L. Li
    Shanghai Advanced Research Institute, Pudong, Shanghai, People’s Republic of China
 
  The design of Shanghai soft X-ray free electron laser (SXFEL) is based on laser driven photocathode, which can provide emittance <2.0 mm’mrad with 500 pC charge. The temporal shape of drive laser has significant influence on the electron beam emittance and brightness. This paper presents the transport line of drive laser system and the temporal shaping techniques for SXFEL. This drive laser produces 8 picosecond 266nm ultraviolet pulses with repetition rate 10Hz. A transverse deflecting cavity was used for indirectly characterizing the laser pulse temporal structure. Here we present the drive laser system with its temporal shaping method, and measurement results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-WEP058  
About • paper received ※ 20 August 2019       paper accepted ※ 28 August 2019       issue date ※ 05 November 2019  
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THP018 Transverse Deflecting Structure Dynamics for Time-Resolved Machine Studies of Shine 632
 
  • J.W. Yan, H.X. Deng, B. Liu, D. Wang
    SINAP, Shanghai, People’s Republic of China
  • H.X. Deng, B. Liu, D. Wang
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
 
  Funding: National Natural Science Foundation of China (11775293), the National Key Research and Development Program of China (2016YFA0401900) and Ten Thousand Talent Program.
The transverse deflecting structure (TDS) has been widely used in modern free electron laser facilities for the longitudinal phase space diagnostics of electron beams. As the first hard x-ray free electron laser in China, the SHINE is designed to deliver photons with a repetition rate up to 1 MHz. In this paper, we present the beam dynamics study of the X-band TDS behind the undulator of SHINE. In order to prevent the screen from being damaged by electron bunches with a high repetition rate, the phase of the transverse deflecting cavity is designed to deviate from zero, and only those electron bunches that are kicked by the transverse deflecting cavity are sent to the screen. In addition, the evolutionary algorithm is introduced to optimize the lattice of the TDS line to reach the highest possible resolution.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-THP018  
About • paper received ※ 19 August 2019       paper accepted ※ 28 August 2019       issue date ※ 05 November 2019  
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WEP089 Pulse Energy Measurement at the SXFEL 521
 
  • Z.P. Liu, H.X. Deng, C. Feng, B. Liu, D. Wang, L.Y. Yu
    SINAP, Shanghai, People’s Republic of China
 
  The test facility is going to generate 8.8 nm FEL radiation using an 840 MeV electron linac passing through the two-stage cascaded HGHG-HGHG or EEHG-HGHG (high-gain harmonic generation, echo-enabled harmonic generation) scheme. Several methods have been developed to measure the power of pulse. The responsivity of silicon photodiode having no loss in the entrance window. Silicon photodiode reach saturates at the SXFEL. In this work, we simulated the attenuator transmittance for different thicknesses. We also show the preparations of the experiment results at the SXFEL .  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2019-WEP089  
About • paper received ※ 20 August 2019       paper accepted ※ 28 August 2019       issue date ※ 05 November 2019  
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