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Title: Downsampled bunch-by-bunch feedback for PEP II

Abstract

The PEP II B Factory requires a feedback system to damp out longitudinal synchrotron oscillations. A time-domain bunch-by-bunch feedback system has been proposed in which each bunch is treated as an oscillator being driven by disturbances from the other bunches. The phase is detected, filtered, and the feedback correction signal is applied by the kicker. Since we are damping energy oscillations using measurements of phase, the required feedback signal must be proportional to the amplitude of the phase oscillations but phase shifted by 90 degrees. This signal must be calculated for each of the 1658 bunches, in parallel. In the original proposal, it was estimated that a farm of approximately 480 digital signal processors (DIPS) would be required to implement the feedback system. However, using the technique of downsampling, this number can be reduced to about 50 DIPS. In what follows, we will briefly explain the basic idea of downsampling and its implementation.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10191566
Report Number(s):
SLAC-PUB-5919; CONF-9204126-17
ON: DE93004090
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: B factories: state of the art in accelerators, detectors, and physics,Stanford, CA (United States),6-10 Apr 1992; Other Information: PBD: Sep 1992
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; PEP STORAGE RINGS; BEAM BUNCHING; FEEDBACK; SYNCHROTRON OSCILLATIONS; BEAM DYNAMICS; PHASE SPACE; SAMPLING; DAMPING; 430303; 430200; EXPERIMENTAL FACILITIES AND EQUIPMENT; BEAM DYNAMICS, FIELD CALCULATIONS, AND ION OPTICS

Citation Formats

Hindi, H A, Briggs, D, Fox, J, Hosseini, W, and Hutton, A. Downsampled bunch-by-bunch feedback for PEP II. United States: N. p., 1992. Web.
Hindi, H A, Briggs, D, Fox, J, Hosseini, W, & Hutton, A. Downsampled bunch-by-bunch feedback for PEP II. United States.
Hindi, H A, Briggs, D, Fox, J, Hosseini, W, and Hutton, A. 1992. "Downsampled bunch-by-bunch feedback for PEP II". United States. https://www.osti.gov/servlets/purl/10191566.
@article{osti_10191566,
title = {Downsampled bunch-by-bunch feedback for PEP II},
author = {Hindi, H A and Briggs, D and Fox, J and Hosseini, W and Hutton, A},
abstractNote = {The PEP II B Factory requires a feedback system to damp out longitudinal synchrotron oscillations. A time-domain bunch-by-bunch feedback system has been proposed in which each bunch is treated as an oscillator being driven by disturbances from the other bunches. The phase is detected, filtered, and the feedback correction signal is applied by the kicker. Since we are damping energy oscillations using measurements of phase, the required feedback signal must be proportional to the amplitude of the phase oscillations but phase shifted by 90 degrees. This signal must be calculated for each of the 1658 bunches, in parallel. In the original proposal, it was estimated that a farm of approximately 480 digital signal processors (DIPS) would be required to implement the feedback system. However, using the technique of downsampling, this number can be reduced to about 50 DIPS. In what follows, we will briefly explain the basic idea of downsampling and its implementation.},
doi = {},
url = {https://www.osti.gov/biblio/10191566}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 1992},
month = {Tue Sep 01 00:00:00 EDT 1992}
}

Conference:
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