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TY - CONF AU - Bellandi, A. AU - Ayvazyan, V. AU - Branlard, J. AU - Cichalewski, W. AU - Gumus, C. AU - Pfeiffer, S. AU - Przygoda, K.P. AU - Rybaniec, R. AU - Schlarb, H. AU - Schmidt, Ch. AU - Sekutowicz, J.K. ED - Schaa, Volker RW ED - Pei, Guoxi ED - Chin, Yong Ho ED - Fu, Shinian ED - Zhao, Ning TI - LLRF R&D Towards CW Operation of the European XFEL J2 - Proc. of LINAC2018, Beijing, China, 16-21 September 2018 CY - Beijing, China T2 - Linear Accelerator Conference T3 - 29 LA - english AB - The ever growing request for machines with a higher average beam pulse rate and also with a relaxed (< 1 MHz) pulse separation calls for superconducting linacs that operate in Long Pulse (LP) or Continuous Wave (CW) mode. For this purpose the European X-ray Free Electron Laser (European XFEL) could be upgraded to add the ability to run in CW/LP mode. Cryo Module Test Bench (CMTB) is a facility used to perform tests on superconducting cavity cryomodules. Because of the interest in upgrading European XFEL to a CW machine, CMTB is now used to perform studies on XM-3, a 1.3 GHz European XFEL-like cryomodule with modified coupling that is able to run with very high quality factor (QL = 10E7…10E8) values. The RF power source allows running the cavities at gradients larger than 16 MV/m. Because of the QL and gradient values involved in these tests, detuning effects like mechanical resonances and microphonics became more challenging to regulate. The goal is then to determine the appropriate set of parameters for the LLRF control system to keep the error to be less than 0.01° in phase and 0.01% in amplitude. PB - JACoW Publishing CP - Geneva, Switzerland SP - 223 EP - 226 KW - FEL KW - cavity KW - controls KW - resonance KW - LLRF DA - 2019/01 PY - 2019 SN - 2226-0366 SN - 978-3-95450-194-6 DO - DOI: 10.18429/JACoW-LINAC2018-MOPO104 UR - http://jacow.org/linac2018/papers/mopo104.pdf ER -