Author: Wang, H.
Paper Title Page
MOCH2 Fabrication, Assembly and Test of the 2×4-cell Superconducting Linac Module for the CAEP FEL-THz facility 19
 
  • X. Luo, T.H. He, C.L. Lao, M. Li, S.F. Lin, L.J. Shan, X.M. Shen, H. Wang, J. Wang, D. Wu, D.X. Xiao, X. Yang, K. Zhou
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  • F. Wang
    PKU, Beijing, People's Republic of China
  
  A 2×4-cell superconducting linac module for the THz-FEL facility has been developed at the China Academy of Engineering Physics, which is expected to provide 6~8 MeV quasi-CW electron beams with an average current of 1~5 mA. The module consists of two 4-cell cavities, two power couplers, two tuners and the cyromodule. The main components are tested before the module assembly. The cavity test includes microwave measurement at room temperature and vertical test at 2 K. The conditioning and test of the couplers are also finished. The performances of the main components and the whole module are present-ed in this paper. The horizontal test indicated that the effective field gradients of both cavities have reached 10 MV/m, which have satisfied our designed goal.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOCH2  
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MOPH30 Commissioning of the 2x4-cell Superconducting Accelerator for the CAEP THz-FEL Facility 96
 
  • K. Zhou, T.H. He, C.L. Lao, M. Li, S.F. Lin, X. Luo, L.J. Shan, X. Shen, H. Wang, J. Wang, D. Wu, D.X. Xiao, X. Yang
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  • X.Y. Lu
    PKU, Beijing, People's Republic of China
  
  The CAEP THz-FEL facility is the first high average power THz radiation user facility in China. The superconducting accelerator including double 4-cell superconducting radio frequency (SRF) cavities is one of the most important components for this facility. The construction and horizontal test of the superconducting accelerator have been finished. At 2K state, the effective gradients of both cavities have reached our designed goal, 10 MV/m. This paper mainly presents the commissioning results of the superconducting accelerator. In the commissioning experiments, the kinetic energy of 5mA electron beams can be accelerated to 8 MeV successfully, with the energy spread less than 0.2%, much better than our design goal. Further beam loading experiments are in progress.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH30  
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WEBH4 Beam Optimization and Measurment of CAEP FEL-THz Injector 179
 
  • D. Wu, C.L. Lao, M. Li, P. Li, S.F. Lin, X. Luo, Q. Pan, L.J. Shan, H. Wang, J. Wang, D.X. Xiao, X. Yang, K. Zhou
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  • X. Li
    TUB, Beijing, People's Republic of China
  
  Funding: Work supported by the National Natural Science Foundation of China with grant (11475159, 11505173, 11576254 and 11605190)
The FEL-THz facility in Chinese Academy of Engineering Physics (CAEP) requires high brightness high repetition electron beam, which needs optimization of multi-parameter and multi-objective, such as emittance, energy spread, bunch length, etc. In this paper, some studies of beam optimization based on differential evolution (DE) algorithm and Astra code are shown. Dozens of the DC-SRF-injector parameters have been considered in the optimization. Some measurements of the electron beam are also introduced, including emittance measurement with the three-profile method, energy spread measurement with analyzing magnet and beam length diagnostics with zero-phasing method. These studies indicate that the injector beam quality satisfies the requirement of the FEL-THz facility. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-WEBH4  
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