Drive laser system for the DC-SRF photoinjector at Peking University

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Zhi-Wen Wang, Sen-Lin Huang, Lin Lin, Gang Zhao, Sheng-Wen Quan, Ke-Xin Liu and Jia-Er Chen. Drive laser system for the DC-SRF photoinjector at Peking University[J]. Chinese Physics C, 2016, 40(1): 017004. doi: 10.1088/1674-1137/40/1/017004
Zhi-Wen Wang, Sen-Lin Huang, Lin Lin, Gang Zhao, Sheng-Wen Quan, Ke-Xin Liu and Jia-Er Chen. Drive laser system for the DC-SRF photoinjector at Peking University[J]. Chinese Physics C, 2016, 40(1): 017004.  doi: 10.1088/1674-1137/40/1/017004 shu
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Received: 2015-03-02
Revised: 2015-08-06
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    Supported by National Basic Research Project (973) (2011CB808302, 2011CB808304)

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Drive laser system for the DC-SRF photoinjector at Peking University

    Corresponding author: Sen-Lin Huang,
  • 1. State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871, China
Fund Project:  Supported by National Basic Research Project (973) (2011CB808302, 2011CB808304)

Abstract: Photoinjectors are widely used for linear accelerators as electron sources to generate high-brightness electron beams. The drive laser, which determines the timing structure and quality of the electron beam, is a crucial component of a photoinjector. A new drive laser system has been designed and constructed for the upgraded 3.5-cell DC-SRF photoinjector at Peking University. The drive laser system consists of a 1064 nm laser oscillator, a four-stage amplifier, second and fourth harmonic generators, an optical system to transfer the UV pulses to the photocathode, and a synchronization system. The drive laser system has been successfully applied during stable operation of the DC-SRF photoinjector and its performance meets requirements. A 266 nm laser with an average power close to 1 W can be delivered to illuminate the Cs2Te photocathode and the instability is less than 5% for long time operation. The design considerations for improving the UV laser quality, a detailed description of the laser system, and its performance are presented in this paper.

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