Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

2 Publications
Improvement of the Photoemission Efficiency of Magnesium Photocathodes
Xiang, R.; Arnold, A.; Lu, P. N.; Michel, P.; Murcek, P.; Teichert, J.; Vennekate, H.; Patra, P.;
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 intensity 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: photocathode, photo-injector, electron source, magnesium, quantum efficiency
  • Poster
    IPAC 2017 - 8th International Particle Accelerator Conference, 14.-19.05.2017, Copenhagen, Denmark
  • Open Access LogoContribution to proceedings
    IPAC 2017 - 8th International Particle Accelerator Conference, 14.-19.05.2017, Copenhagen, Denmark
    Proceedings of the 8th International Particle Accelerator Conference, Genf: JACoW

Publ.-Id: 26693 - Permalink