大电流密度Cs_3Sb光电阴极工艺与寿命的研究

PREPARATION AND LIFE-TEST OF Cs_3Sb PHOTOCATHODES FOR LARGE CURRENT DENSITY EMISSION

为满足大电流密度电子发射的需要,对锑铯光电阴极的制备工艺进行了研究。设计了一种效率高便于再生的管道铯源。对于绿光(λ=514.5nm)光电阴极量子产额达到2.5%,脉冲工作状态下,发射电流密度可长时间保持1.4A/cm^2。

To meet the needs of high electron current density photocathodes, the processes for preparing cesium antimonide have been studied. A new channellike cesium source was designed, which is proved to be efficient and convenient for cathode rejuvenation. The quantum efficiency is about 2.5% at the wavelength of 514.5 nm (green light), when the photocathode is illuminated by the pulsed laser with similar wavelength, a current density of 1.4 A/cm^2(peak) of the photoemission can he sustained for a long time.