Kühn, J.; Al-Saokal, N.; Bürger, M.; Frahm, A.; Jankowiak, A.; Kamps, T.; Klemz, G.; Kourkafas, G.; Mistry, S.; Neumann, A.; Ohm-Krafft, N.; Schmeißer, M.; Schuster, M.; Völker, J.: A Cu Photocathode for the Superconducting RF Photoinjector of BERLinPro. In: Shane Koscielniak ... [Ed.] : IPAC2018 : Proceedings of the 9th International Particle Accelerator Conference, Vancouver, BC, CanadaJACoW, 2018. - ISBN 978-3-95450-184-7, p. TUPMF002/1-4
http://accelconf.web.cern.ch/AccelConf/ipac2018/papers/tupmf002.pdf
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Abstract:
The initial commissioning of the Superconducting RF (SRF) photoinjector is achieved with a Cu photocathode due to its robustness with respect to interactions with the SRF cavity of the injector. Here we present the preparation and characterization of a Cu photocathode plug and the diagnostics to insert the photocathode in the back wall of the SRF cavity. A polycrystalline bulk Cu plug was polished, particle free cleaned and characterized by x-ray photoelectron spectroscopy. During the transfer of the photocathode insert into the gun module the whole process was controlled by several diagnostic tools monitoring the insert position as well as RF, vacuum and cryogenic signals. We discuss the challenges of the photocathode transfer into an SRF cavity and how they can be tackled.