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TY - CONF AU - Dutine, M. AU - Arnold, M. AU - Bahlo, T. AU - Grewe, R. AU - Jürgensen, L.E. AU - Pietralla, N. AU - Schließmann, F. AU - Steinhorst, M. ED - Schaa, Volker RW ED - Jansson, Andreas ED - Shea, Thomas ED - Olander, Johan TI - Concept of a Beam Diagnostics System for the Multi-Turn ERL Operation at the S-DALINAC J2 - Proc. of IBIC2019, Malmö, Sweden, 08-12 September 2019 CY - Malmö, Sweden T2 - International Beam Instrumentation Conferenc T3 - 8 LA - english AB - The S-DALINAC* is a thrice-recirculating linear electron accelerator operating in cw-mode at a frequency of 3 GHz. A path-length adjustment system in the second recirculation beam line allows to shift the beam phase by 360° and thus to operate in ERL mode. For the multi-turn ERL operation, the beam will be accelerated twice and subsequently decelerated twice again (not demonstrated yet). For this mode, it is necessary to develop a nondestructive beam diagnostics system in order to measure the beam position, phase and beam current of both, the accelerated and the decelerated beam, simultaneously in the same beamline. A particular challenge will be the operation at low beam currents of 100 nA, which corresponds to bunch charges of about 30 aC. The conceptional study of a 6 GHz resonant cavity beam position monitor will be presented together with alternative solutions. PB - JACoW Publishing CP - Geneva, Switzerland SP - 505 EP - 508 KW - cavity KW - linac KW - operation KW - recirculation KW - impedance DA - 2019/11 PY - 2019 SN - 978-3-95450-204-2 DO - doi:10.18429/JACoW-IBIC2019-WEPP004 UR - http://jacow.org/ibic2019/papers/wepp004.pdf ER -