Research and Fabrication of the Photocathodes for DC-SC Photoinjector

XIANG Rong; QUAN Sheng-Wen; LIN Lin; DING Yuan-Tao; LU Xiang-Yang; JIAO Fei; WANG Gui-Mei; ZHAO Kui

Chinese Physics C> 2004, Vol. 28> Issue(7) : 771-774

Research and Fabrication of the Photocathodes for DC-SC Photoinjector

RF Superconducting Accelerator Laboratory,Institute of Heavy lon Physics,Peking University,Beijing 100871,China

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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.

References

[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.

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Received: 2003-10-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2003-10-21
Accepted Date: 1900-01-01
Available Online: 2004-07-05

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.