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TY - CONF AU - Guo, J. AU - Stirbet, M. AU - Wang, H. AU - Wang, S. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - High Order Modes Survey and Mitigation of the CEBAF C100 Cryomodules J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - Ten new C100 cryomodules have been installed for the CEBAF 12GeV upgrade in the last few years. The high order modes (HOM) of these cryomodules need to be controlled to avoid beam breakup (BBU) instability. We surveyed the HOM for all the 80 cavities of the C100 modules in both the JLab cryomodule test facility (CMTF) and the CEBAF tunnel. Additional measures such as waveguide filters were applied to bring down out of spec modes. In this paper, we will present the HOM survey setup and results. The mitigation measures and their effects will also be discussed. PB - JACoW CP - Geneva, Switzerland SP - 2660 EP - 2662 KW - HOM KW - cavity KW - impedance KW - cryomodule KW - survey DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-WEPRI073 UR - http://jacow.org/ipac2014/papers/wepri073.pdf ER -