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TY - CONF AU - Wu, Q. AU - Belomestnykh, S.A. AU - Ben-Zvi, I. AU - Blaskiewicz, M. AU - DeSanto, L. AU - Goldberg, D. AU - Harvey, M. AU - Hayes, T. AU - McIntyre, G.T. AU - Mernick, K. AU - Orfin, P. AU - Seberg, S.K. AU - Severino, F. AU - Smith, K.S. AU - Than, R. AU - Zaltsman, A. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - The First Operation of 56 MHz SRF Cavity in RHIC J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - A 56 MHz superconducting RF cavity has been designed, fabricated and installed in the Relativistic Heavy Ion Collider (RHIC). The cavity operated at 4.4 K with a “quiet helium source” to isolate the cavity from environmental acoustic noise. The cavity is a beam driven quarter wave resonator. It is detuned and damped during injection and acceleration cycles and is brought to operation only at store energy. For a first test operation, the cavity voltage was stabilized at 300 kV with full beam current. Within both Au + Au and asymmetrical Au + He3 collisions, luminosity improvement was detected from direct measurement, and the hourglass effect was reduced. One higher order mode (HOM) coupler was installed on the cavity. We report in this paper on our measurement of a broadband HOM spectrum excited by the Au beam. PB - JACoW CP - Geneva, Switzerland SP - 3767 EP - 3769 KW - cavity KW - HOM KW - operation KW - SRF KW - cryomodule DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-THPF033 UR - http://jacow.org/ipac2015/papers/thpf033.pdf ER -