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TY - CONF AU - Verdú-Andrés, S. AU - Calaga, R. AU - Cano-Pleite, E. AU - Leuxe, R. AU - Mitchell, J.A. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Design of LHC Crab Cavities Based on DQW Cryomodule Test Experience J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - A cryomodule with two Double-Quarter Wave (DQW) cavities was designed, built and tested with the SPS beam in 2018. Each cavity was equipped with an rf pickup antenna to monitor field amplitude and phase. The pickup antenna also included a section expressly designed to couple and extract one of the Higher-Order Modes (HOM) at 1.754 GHz. The SPS beam tests evidenced direct coupling of the beam to this pickup antenna, in a similar way that a beam position monitor pickup couples to the passing beam. This undesired coupling had an impact on the RF feedback system responsible to regulate the cavity field and frequency. The present paper proposes a new DQW cavity design with improved antennae which provides adequate fundamental mode extraction while providing a reduction of both direct coupling to the beam and heat dissipation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 925 EP - 928 KW - cavity KW - pick-up KW - coupling KW - HOM KW - controls DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-THP035 UR - http://jacow.org/srf2019/papers/thp035.pdf ER -