Neumann, A.; Böhlick, D.; Bürger, M.; Echevarria, P.; Glock, H.-W.; Göbel, F.; Heling, S.; Janke, K.; Jankowiak, A.; Kamps, T.; Klauke, S.; Klemz, G.; Knobloch, J.; Kourkafas, G.; Kühn, J.; Leuschner, N.; Ohm, N.; Panofski, E.; Plötz, H.; Rotterdam, S.; Stein, H.; Schmießer, M.; Schuster, M.; Tamashevic, Y.; Ullrich, J.; Ushakov, A.; Völker, J.: The BERLinPro SRF Photoinjector System - From First RF Commissioning to First Beam. In: Shane Koscielniak ... [Ed.] : IPAC2018 : Proceedings of the 9th International Particle Accelerator Conference, Vancouver, BC, CanadaGeneve: JACoW, 2018. - ISBN 978-3-95450-184-7, p. TUPML053/1-4
http://accelconf.web.cern.ch/AccelConf/ipac2018/papers/tupml053.pdf
Open Access Version
Abstract:
Helmholtz-Zentrum Berlin (HZB) is currently constructing a high average current superconducting (SC) ERL as a prototype to demonstrate low normalized beam emittance of 1 mm·mrad at 100 mA and short pulses of about 2 ps. To attain the required beam properties, an SRF based photoinjector system was developed and during the past year underwent RF commissioning and was setup within a dedicated diagnostics beamline called Gunlab to analyze beam dynamics of both, a Copper cathode and a CsK2Sb cathode as well as their quantum efficiency at UV and green light respectively. The medium power prototype - a first stage towards the final high power 100 mA design - presented here features a 1.4×λ/2 cell SRF cavity with a normal-conducting, high quantum efficiency Cs2KSb cathode, implementing a modified HZDR-style cathode insert. This injector potentially allows for 6 mA beam current and up to 3.5 MeV kinetic energy, limited by the modified twin TTF-III fundamental power couplers. In this contribution, the first RF commissioning results of the photo-injector module will be presented including dark current analysis as well as measured beam properties with an initially installed Copper cathode