CERN Accelerating science

Article
Title	RHIC BPM System Modifications and Performance
Author(s)	Satogata, Todd ; Calaga, Rama ; Cameron, Peter ; Cerniglia, Phil ; Cupolo, John ; Curcio, Anthony J ; Dawson, William C ; Degen, Christopher ; Gullotta, Justin ; Mead, Joe ; Michnoff, Robert ; Russo, Thomas ; Sikora, Robert
Affiliation	(BNL, Upton, Long Island, New York)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2021
Subject category	Accelerators and Storage Rings
Abstract	The RHIC beam position monitor (BPM) system provides independent average orbit and turn-by-turn (TBT) position measurements. In each ring, there are 162 measurement locations per plane (horizontal and vertical) for a total of 648 BPM planes in the RHIC machine. During 2003 and 2004 shutdowns, BPM processing electronics were moved from the RHIC tunnel to controls alcoves to reduce radiation impact, and the analog signal paths of several dozen modules were modified to eliminate gain-switching relays and improve signal stability. This paper presents results of improved system performance, including stability for interaction region and sextupole beam-based alignment efforts. We also summarize performance of improved million-turn TBT acquisition channels for nonlinear dynamics and echo studies.