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 optimum cathode type and its further improvement is a fundamental issue for the progress in radio-frequency photoinjectors. Metallic photocathodes offer several advantages over the semiconductor ones, e.g. long lifetime and prompt response time on the photoemission. This paper reviews the requirements and the current status of metallic photocathodes prepared by pulsed laser ablation deposition technique. Magnesium, yttrium and lead are proposed as good alternative to copper photocathode which is generally used in radio-frequency photoinjectors. Parametric studies of the irradiation conditions are demanded to optimize the metallic thin film deposition. The main achievements on the morphology and structure characterization as well as photoemission testing of metallic photocathodes are presented and discussed.
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Acknowledgements
This work was supported by the Italian National Institute of Nuclear Physics (INFN). The author wishes to thank Prof. A. Perrone for the fruitful scientific discussions, Dr. F. Gontad and Dr. L. Cultrera for their experimental support.
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Lorusso, A. Overview and development of metallic photocathodes prepared by laser ablation. Appl. Phys. A 110, 869–875 (2013). https://doi.org/10.1007/s00339-012-7168-z
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DOI: https://doi.org/10.1007/s00339-012-7168-z