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TY - CPAPER AU - Sulimov, A.A. TI - HOM Coupler Notch Filter Tuning for the European XFEL Cavities J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - The notch filter (NF) tuning prevents the extraction of fundamental mode (1.3 GHz) RF power through Higher Order Modes (HOM) couplers. The procedure of NF tuning was optimized at the beginning of serial European XFEL cavities production. It allows keeping the filter more stable against temperature and pressure changes during cavity cool down. Some statistics of NF condition during cavities and modules cold tests is presented. PB - JACoW CY - Geneva, Switzerland SP - 1274 EP - 1276 KW - HOM KW - cavity KW - controls KW - resonance KW - database DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-THPB067 UR - http://srf2015.vrws.de/papers/thpb067.pdf ER -