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TY - CONF AU - Bahlo, T. AU - Burandt, C. AU - Hug, F. AU - Pietralla, N. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Implementation of a High Level Phase Controller for the Superconducting Injector of the S-DALINAC J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - The Superconducting DArmstadt LINear Accelerator S‑DALINAC is a recirculating electron accelerator with a design energy of 130 MeV. It operates in cw-mode at a radio frequency of 3 GHz and provides either unpolarized or polarized electron beams. Before entering the main accelerator the electron beam passes both, a normal-conducting injector beamline for beam preparation and a superconducting 10 MeV injector beamline for preacceleration. The phase of the beam which is injected into the 40 MeV main accelerator is crucial for the efficiency of the acceleration process and the minimization of the energy spread. Due to thermal drifts of the normal-conducting injector cavities this injection phase varies by about 0.2 degree over a timescale of an hour. In order to compensate these drifts, a high level phase controller has been implemented. It adjusts the phase measured at an rf-monitor at the exit of the superconducting injector by changing the phase of a prebuncher in the normal-conducting injector beamline. We will present the used hardware, the control algorithm as well as measurements showing the phase stabilization achieved by this controller. PB - JACoW CP - Geneva, Switzerland SP - 814 EP - 816 KW - electron KW - controls KW - cavity KW - EPICS KW - injection DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPHA019 UR - http://jacow.org/ipac2015/papers/mopha019.pdf ER -