Effects of laser pulse heating of copper photocathodes on high-brightness electron beam production at blowout regime

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Lian-Min Zheng, Ying-Chao Du, Chuan-Xiang Tang and Wei Gai. Effects of laser pulse heating of copper photocathodes on high-brightness electron beam production at blowout regime[J]. Chinese Physics C, 2017, 41(6): 067002. doi: 10.1088/1674-1137/41/6/067002
Lian-Min Zheng, Ying-Chao Du, Chuan-Xiang Tang and Wei Gai. Effects of laser pulse heating of copper photocathodes on high-brightness electron beam production at blowout regime[J]. Chinese Physics C, 2017, 41(6): 067002.  doi: 10.1088/1674-1137/41/6/067002 shu
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Received: 2016-11-17
Revised: 2017-01-06
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    Supported by National Natural Science Foundation of China (11375097)}

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Effects of laser pulse heating of copper photocathodes on high-brightness electron beam production at blowout regime

    Corresponding author: Chuan-Xiang Tang,
  • 1. Accelerator Laboratory, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 2. Key Laboratory of Particle &
  • 3. High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
Fund Project:  Supported by National Natural Science Foundation of China (11375097)}

Abstract: Producing high-brightness and high-charge (>100 pC) electron bunches at blowout regime requires ultrashort laser pulses with high fluence. The effects of laser pulse heating of the copper photocathode are analyzed in this paper. The electron and lattice temperature is calculated using an improved two-temperature model, and an extended Dowell-Schmerge model is employed to calculate the thermal emittance and quantum efficiency. A time-dependent growth of the thermal emittance and the quantum efficiency is observed. For a fixed amount of charge, the projected thermal emittance increases with decreasing laser radius, and this effect should be taken into account in laser optimization at blowout regime. Moreover, laser damage threshold fluence is simulated, showing that the maximum local fluence should be less than 40 mJ/cm2 to prevent damage to the cathode.

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