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Fast digital transverse feedback system for bunch train operation in CESR

Abstract

We have developed a time domain transverse feedback system with the high bandwidth needed to control transverse instabilities when the CESR e{sup +}e{sup -} collider is filled with trains of closely spaced bunches. This system is based on parallel digital processors and a stripline driver. It is capable of acting on arbitrary patterns of bunches having a minimum spacing of 14 ns. Several simplifying features have been introduced. A single shorted stripline kicker driven by one power amplifier is used to control both counter-rotating beams. The desired feedback phase is achieved by sampling the bunch position at a single location on two independently selectable beam revolutions. The system adapts to changes in the betatron tune, bunch pattern, or desired damping rate through the loading of new parameters into the digital processors via the CESR control system. The feedback system also functions as a fast gated bunch current monitor. Both vertical and horizontal loops are now used in CESR operation. The measured betatron damping rates with the transverse feedback system in operation are in agreement with the analytical prediction and a computer simulation developed in connection with this work. (author)
Authors:
Rogers, J T; Billing, M G; Dobbins, J A [1] 
  1. Cornell Univ., Ithaca, NY (United States). Lab. of Nuclear Studies; and others
Publication Date:
Aug 01, 1996
Product Type:
Conference
Report Number:
KEK-PROC-96-6; CONF-9506279-
Reference Number:
SCA: 430400; PA: JPN-97:003178; EDB-97:062598; SN: 97001772751
Resource Relation:
Conference: CEIBA95: international workshop on collective effects and impedance for B-factories, Tsukuba (Japan), 12-17 Jun 1995; Other Information: PBD: Aug 1996; Related Information: Is Part Of Proceedings of the international workshop on collective effects and impedance for B-factories (CEIBA95); Chin, Yongho [ed.]; PB: 531 p.
Subject:
43 PARTICLE ACCELERATORS; RF SYSTEMS; CESR STORAGE RING; FEEDBACK; ELECTRONIC CIRCUITS; BEAM BUNCHING; INSTABILITY; FILTERS; DIGITAL CIRCUITS; OPERATION
OSTI ID:
461189
Research Organizations:
National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE97729548; TRN: JP9703178
Availability:
OSTI as DE97729548
Submitting Site:
JPN
Size:
pp. 475-480
Announcement Date:

Citation Formats

Rogers, J T, Billing, M G, and Dobbins, J A. Fast digital transverse feedback system for bunch train operation in CESR. Japan: N. p., 1996. Web.
Rogers, J T, Billing, M G, & Dobbins, J A. Fast digital transverse feedback system for bunch train operation in CESR. Japan.
Rogers, J T, Billing, M G, and Dobbins, J A. 1996. "Fast digital transverse feedback system for bunch train operation in CESR." Japan.
@misc{etde_461189,
title = {Fast digital transverse feedback system for bunch train operation in CESR}
author = {Rogers, J T, Billing, M G, and Dobbins, J A}
abstractNote = {We have developed a time domain transverse feedback system with the high bandwidth needed to control transverse instabilities when the CESR e{sup +}e{sup -} collider is filled with trains of closely spaced bunches. This system is based on parallel digital processors and a stripline driver. It is capable of acting on arbitrary patterns of bunches having a minimum spacing of 14 ns. Several simplifying features have been introduced. A single shorted stripline kicker driven by one power amplifier is used to control both counter-rotating beams. The desired feedback phase is achieved by sampling the bunch position at a single location on two independently selectable beam revolutions. The system adapts to changes in the betatron tune, bunch pattern, or desired damping rate through the loading of new parameters into the digital processors via the CESR control system. The feedback system also functions as a fast gated bunch current monitor. Both vertical and horizontal loops are now used in CESR operation. The measured betatron damping rates with the transverse feedback system in operation are in agreement with the analytical prediction and a computer simulation developed in connection with this work. (author)}
place = {Japan}
year = {1996}
month = {Aug}
}