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Title: RHIC 10 Hz global orbit feedback system

Vibrations of the cryogenic triplet magnets at the Relativistic Heavy Ion Collider (RHIC) are suspected to be causing the horizontal beam perturbations observed at frequencies around 10 Hz. Several solutions to counteract the effect have been considered in the past, including a local beam feedback system at each of the two experimental areas, reinforcing the magnet base support assembly, and a mechanical servo feedback system. However, the local feedback system was insufficient because perturbation amplitudes outside the experimental areas were still problematic, and the mechanical solutions are very expensive. A global 10 Hz orbit feedback system consisting of 36 beam position monitors (BPMs) and 12 small dedicated dipole corrector magnets in each of the two 3.8 km circumference counter-rotating rings has been developed and commissioned in February 2011. A description of the system architecture and results with beam will be discussed.
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Publication Date:
OSTI Identifier:
1012585
Report Number(s):
BNL--94194-2011-CP
R&D Project: KBCH139; 18035; KB0202011; TRN: US1102327
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401
Research Org:
Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
Sponsoring Org:
DOE - Office Of Science
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; AMPLITUDES; ARCHITECTURE; BEAM POSITION; CRYOGENICS; DIPOLES; FEEDBACK; HEAVY IONS; MAGNETS; MONITORS; TRIPLETS relativistic heavy ion collider