A future upgrade of the European XFEL foresees High-Duty-Cycle (HDC) operation which requires a new electron beam injector. The centerpiece of such a photoinjector is a continuous wave (CW) L-band superconducting radio frequency (SRF) cavity developed at DESY. This cavity demonstrated world record peak axial electric field values of up to 50 MV/m with a copper (Cu) cathode, thread mounted to the cavity backwall. In this contribution, we report on the present status of the cavity design, describe the cold integration of the cavity including the cryostat, tuner and solenoid magnet, and show the plans for a test facility being built to verify the beam quality produced by this SRF injector.
Jaster-Merz et al. (Wed,) studied this question.