In 2010 HZB has received approval to build BERLinPro , an ERL project to demonstrate energy recovery at 100 mA beam current by pertaining a high quality beam. These goals place stringent requirements on the SRF cavity for the photoinjector which has to deliver a small emittance 100 mA beam with at least 1.8 MeV kinetic energy while lim ited by fundamental power coupler performance to about 230 kW forward power. In oder to achieve these goals the injector cavity is being developed in a three stage ap proach. The current design studies focus on implementing a normal conducting cathode insert into a newly developed superconducting photoinjector cavity. In this paper the fun damental RF design calculations concerning cell shape for optimized beam dynamics as well as SRF performance will be presented. Further studies concentrate on HOM proper ties, the field flatness and tuning mechanism for that de sign
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