新型注铯镁金属光阴极的实验研究

报道了用于激光驱动高亮度注入器的新型光阴极的实验研究.用铯离子注入的方法得到了在镁基底上的掺铯合金光阴极，研究了注入、溅射及光电发射的机制和参数.用此阴极得到了比纯金属镁阴极高约一个量级的量子效率和绿光下的单光子发射效应，为用于强流短脉冲电子束的光阴极研究提供了新的途径. 关键词：

EXPERIMENTAL STUDY OF NEW-TYPE Cs+ ION-IMPLANTED Mg PHOTOCATHODE

The development of a new-type photocathode for laser-driven high-brightness e-beam injector was reported.By the use of Cs^{+ ion implantation,a Mg-Cs alloy photocathode on Mg substrate was made.Some parameters of the ion implantation,the sputtering process,the photoemission and its mechanism were studied.Compared with the pure Mg photocathode,an order of magnitude improvement in the quantum efficiency from this photocathode has been obtained,meanwhile,we have also obtained a single-photon electron emission under the driving of 532nm green laser,the latter is a new development for the first time so far as we know in the world.Our experimental results provided a new way for the technology of high current,ultra short pulse e-beam.}