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TY - UNPB AU - Jensen, E. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - ERL as a Versatile SRF Test Facility J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - In order to use an ERL as a test facility for SRF equipment, it must have sufficient flexibility built in to allow tests at different acceleration voltages and frequencies. With help of a DC photo-cathode, operation at diverse frequencies is possible even if the injector buncher/booster is operating at a fixed frequency. To this end, the laser should pulse at a subharmonic n of this frequency. Possible test frequencies in the ERL are then any harmonic of this subharmonic, which allows for tests at many frequencies. With n=33, we could reach all usual frequencies up to 1.3 GHz. To reach this flexibility it is equally required to adapt the path length in the ERL by approximately ±λ/2 of the smallest envisaged test frequency, so typically some 50 cm, for example with adjustable girders. For a multi-turn ERL, the fields in the return arc magnets must be individually controllable to allow for different accelerating voltages in the SRF device under test. Once these conditions are satisfied, an ERL allows for tests of SRF equipment with large beam powers but relatively little power consumption. PB - JACoW Publishing CP - Geneva, Switzerland ER -