High precision tune and coupling measurements and tune/coupling feedback in RHIC

Minty, M. ; Curcio, A. ; Dawson, C. ; Degen, C. ; Luo, Y. ; Marr, G. ; Martin, B. ; Marusic, A. ; Mernick, K. ; Oddo, P. ; Russo, T. ; Schoefer, V. ; Schroeder, R. ; Schulthiess, C. ; Wilinski, M.

关键词: ACCURACY;    BETATRONS;    FEEDBACK;    MODIFICATIONS;    PERFORMANCE;    POLARIZATION;    PROTON BEAMS;    RESOLUTION relativistic heavy ion collider;   

DOI  :  10.2172/988800
RP-ID  :  BNL--93902-2010-IR
PID  :  OSTI ID: 988800
Others  :  R&D Project: KBCH139
Others  :  18035
Others  :  Other: KB0202011
Others  :  TRN: US1007014

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Precision measurement and control of the betatron tunes and betatron coupling in RHIC are required for establishing and maintaining both good operating conditions and, particularly during the ramp to high beam energies, high proton beam polarization. While the proof-of-principle for simultaneous tune and coupling feedback was successfully demonstrated earlier, routine application of these systems has only become possible recently. Following numerous modifications for improved measurement resolution and feedback control, the time required to establish full-energy beams with the betatron tunes and coupling regulated by feedback was reduced from several weeks to a few hours. A summary of these improvements, select measurements benefitting from the improved resolution and a review of system performance are the subject of this report.