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TY - CONF AU - Hall, D.L. AU - Bartnik, A.C. AU - Billing, M.G. AU - Gonnella, D. AU - Hoffstaetter, G.H. AU - Liepe, M. AU - Mayes, C.E. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Beam-based HOM Measurements in Cornell's ERL Main Linac Cavity J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - A search for HOMs in Cornell’s ERL main linac cavity installed in a Horizontal Test Cryomodule (HTC) has been carried out using a bunch charge modulation method, as part of the effort towards building an Energy Recovery Linac (ERL). The beam-based HOM measurements offer the significant advantage of being able to detect trapped modes invisible to both the RF pickup probes and HOM damping loads, and allow for measuring the R/Q of the modes. For each HOM detected during the search, measurements were taken to determine its nature (monopole, dipole, etc.), frequency, loaded quality factor and shunt impedance. A selection of the most notable modes found is presented, compared to 3D HOM simulations, and their potential impact on the BBU current of the future Cornell ERL is discussed. PB - JACoW CP - Geneva, Switzerland SP - 359 EP - 362 KW - HOM KW - cavity KW - dipole KW - quadrupole KW - linac DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-MOPRO113 UR - http://jacow.org/ipac2014/papers/mopro113.pdf ER -