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2 PublicationsImprovements of the photoemission efficiency of magnesium photocathodes
Xiang, R.; Arnold, A.; Michel, P.; Murcek, P.; Teichert, J.; Lu, P.; Vennekate, H.; Patra, P.
Abstract
To improve the quality of photocathodes is one of the critical issues in enhancing the stability and reliability of photo-injector systems. Presently the primary choice is to use metallic photocathodes for the ELBE SRF Gun II to reduce the risk of contamination of the superconducting cavity. Magnesium has a low work function (3.6 eV) and shows high quantum efficiency (QE) up to 0.3 % after laser cleaning. The SRF Gun II with an Mg photocathode has successfully provided electron beam for ELBE users. However, the present cleaning process with a high intensi-ty laser (activation) is time consuming and generates unwanted surface roughness. This paper presents the investigation of alternative surface cleaning procedures, such as thermal treatment. The QE and topography of Mg samples after treatment are reported.
Keywords: magnesium photocathodes; quantum efficiency; SRF photoinjector
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
- SRF Gun
Related publications
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 25651) publication
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Contribution to proceedings
The 8th International Particle Accelerator Conference (IPAC’17), 14.-19.05.2017, Copenhagen, Danmark
Proceedings of IPAC'17 -
Poster
The 8th International Particle Accelerator Conference (IPAC’17), 14.-19.05.2017, Copenhagen, Denmark
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