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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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

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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.

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Research and Fabrication of the Photocathodes for DC-SC Photoinjector

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