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TY - CPAPER AU - Wu, Q. AU - Belomestnykh, S.A. AU - Ben-Zvi, I. AU - Blaskiewicz, M. AU - Hayes, T. AU - Mernick, K. AU - Severino, F. AU - Smith, K.S. AU - Zaltsman, A. TI - Beam Commissioning of the 56 MHz QW Cavity in RHIC J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - A 56 MHz superconducting RF cavity has been designed, fabricated and installed in the Relativistic Heavy Ion Collider (RHIC). The cavity operates 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. We have observed clear luminosity increase and bunch length reduction in the first operation of the cavity with Au + Au and Au + He3 collisions. The cavity voltage was limited by quenching in the Higher Order Mode coupler. This paper also discusses the cavity beam experiments with no higher order mode coupler in p + p and p + Au RHIC operation. PB - JACoW CY - Geneva, Switzerland SP - 982 EP - 986 KW - cavity KW - HOM KW - operation KW - damping KW - SRF DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-WEBA07 UR - http://srf2015.vrws.de/papers/weba07.pdf ER -