| Title |
Study of Magnesium Photocathodes for Superconducting RF Photoinjectors |
| Authors |
- R. Xiang, A. Arnold, P.N. Lu, P. Murcek, J. Teichertpresenter, H. Vennekate
HZDR, Dresden, Germany
|
| Abstract |
The superconducting RF photoinjector (SRF Gun II) has successfully served for the ELBE user facility at HZDR. Nevertheless, the quality of photocathodes is one of the most critical issues in improving the stability and reliability for its application. Magnesium has a comparably low work function (3.6 eV) and shows a quantum efficiency up to 0.3% after laser cleaning. However, the present cleaning process with a high intensity laser beam is time consuming and produces unwanted surface roughness, which leads to a higher thermal emittance. Thermal treatment and Excimer laser cleaning for Mg cathodes are investigated as alternative methods. In this work, the new cleaning procedures are tested and optimized, and the quantum efficiency of Mg samples with different microstructure, composition and suppliers are compared.
|
| Funding |
The work is supported by the German Federal Ministry of Education and Research (BMBF) grant 05K12CR1. |
| Paper |
download THPMF039.PDF [1.132 MB / 3 pages] |
| Export |
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| Conference |
IPAC2018, Vancouver, BC, Canada |
| Series |
International Particle Accelerator Conference (9th) |
| Proceedings |
Link to full IPAC2018 Proccedings |
| Session |
MC2 Poster Session |
| Date |
03-May-18 16:00–17:30 |
| Main Classification |
02 Photon Sources and Electron Accelerators |
| Sub Classification |
T02 Electron Sources |
| Keywords |
laser, gun, cathode, SRF, cavity |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada) |
| ISBN |
978-3-95450-184-7 |
| Published |
June 2018 |
| Copyright |
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