Research and Fabrication of the Photocathodes for DC-SC Photoinjector

  • DC-SC photoinjector is a new injector based on the laser-driven photocathode. It is designed to produce the electron beam with high average current required by high average power FEL experiments. For this projector, Cs2Te and Cs3Sb photocathodes are fabricated in a self-designed preparation chamber, which is bakable and the vacuum can reach values of 10-6Pa. Cs2Te is excited by 266nm UV laser, and its quantum efficiency(QE) is above 2.5% for more than 50 hours, and the QE of Cs3Sb at 532nm is about 2% and stable for only several hours in vacuum. They can provide enough electrons for our electron gun. Because of its stability, Cs2Te is adopted in the test facility of the DC-SC photoinjector.
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  • [1] . ZHAO Kui, QUAN Sheng-Wen, HAO Jian-Kui et al. Nucl. Instrum.Methods, 2002, A 483: 1252. ZHAO Kui, DING Yuan-Tao, HUANG Sen-Lin et al. FEL Project andOpt imized Design of IR SASE FEL at Peking University. Proc. FEL2003. Tsukuba, Ibaraki, Japan, 20033. HU Yan-Le et al. HEPNP, 2001, 25(8) : 787(in Chinese)(胡岩乐等,高能物理与核物理,2001,25(8):787)4. ZHAO Kui, HAO Jian-Kui , HU Yan-Le et al. Nuclear Instruments andMethods in Physics Research 2001, A474: 564-5685. Boscolo I, Michelato P. Nucl. Instrum. Methods, 2000, A445: 389-3936. Aulenbachert K. RF Guns and the Production of Polarized Electrons.CLIC Note 303 01. 05. 1996, NLC-Not e 20 Distribution: sources/injectors SLAC, 1May 19967. Kong S H, Kinross-Wright J, Nguyen D C et al. Nucl . Instrum Methods, 1995 A358: 272 - 2758. XIANG Rong, LIN Lin, ZHANG Bao-Cheng et al. Atomic Energy Science and Technology, China, 2004, 38( 2) : 185-188 (in Chinese)(向蓉,林林,张保澄等.原子能科学技术,2004 , 38 (2) : 185-188)
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XIANG Rong, QUAN Sheng-Wen, LIN Lin, DING Yuan-Tao, LU Xiang-Yang, JIAO Fei, WANG Gui-Mei and ZHAO Kui. Research and Fabrication of the Photocathodes for DC-SC Photoinjector[J]. Chinese Physics C, 2004, 28(7): 771-774.
XIANG Rong, QUAN Sheng-Wen, LIN Lin, DING Yuan-Tao, LU Xiang-Yang, JIAO Fei, WANG Gui-Mei and ZHAO Kui. Research and Fabrication of the Photocathodes for DC-SC Photoinjector[J]. Chinese Physics C, 2004, 28(7): 771-774. shu
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Received: 2003-10-21
Revised: 1900-01-01
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Research and Fabrication of the Photocathodes for DC-SC Photoinjector

    Corresponding author: XIANG Rong,
  • RF Superconducting Accelerator Laboratory,Institute of Heavy lon Physics,Peking University,Beijing 100871,China

Abstract: DC-SC photoinjector is a new injector based on the laser-driven photocathode. It is designed to produce the electron beam with high average current required by high average power FEL experiments. For this projector, Cs2Te and Cs3Sb photocathodes are fabricated in a self-designed preparation chamber, which is bakable and the vacuum can reach values of 10-6Pa. Cs2Te is excited by 266nm UV laser, and its quantum efficiency(QE) is above 2.5% for more than 50 hours, and the QE of Cs3Sb at 532nm is about 2% and stable for only several hours in vacuum. They can provide enough electrons for our electron gun. Because of its stability, Cs2Te is adopted in the test facility of the DC-SC photoinjector.

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