Abstract
The development of photocathodes materials has become an important task for X-ray free electron laser and new generation of particle accelerator. The choice of the op- timum cathode type and its further improvement is a funda- mental issue for the progress in radio-frequency photoinjec- tors. Metallic photocathodes offer several advantages over the semiconductor ones, e.g. long lifetime and prompt re- sponse time on the photoemission. This paper reviews the requirements and the current status of metallic photocath- odes prepared by pulsed laser ablation deposition technique. Magnesium, yttrium and lead are proposed as good alterna- tive to copper photocathode which is generally used in radio- frequency photoinjectors. Parametric studies of the irradia- tion conditions are demanded to optimize the metallic thin film deposition. The main achievements on the morphology and structure characterization as well as photoemission test- ing of metallic photocathodes are presented and discussed.
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