| Paper | Title | Page |
|---|---|---|
PS07 |
Fabrication and Performance of Cs2Te Photocathode for DC–SRF Gun at Peking University | |
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| DC–SRF photocathode gun is being commissioned in Peking University, which is aimed to produce mA level average current beam. In order to fulfill high quantum efficiency and long life time, the cesium telluride was chosen as the photocathode. The formation and characterization of the photoemissive film is presented. The QE of the fresh photocathode is around 8% and stabilized at 0.5% after weeks' operation (@266nm). After storage in 10-7Pa's vacuum for weeks, the QE showed no decrease. The rejuvenation effect (the reduction of the QE after exposure to residual gas in the chamber) was also investigated by heating and illuminated by the UV light. The pollution was mainly due to the low level vacuum. | ||