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Title: Closed orbit feedback with digital signal processing

Abstract

The closed orbit feedback experiment conducted on the SPEAR using the singular value decomposition (SVD) technique and digital signal processing (DSP) is presented. The beam response matrix, defined as beam motion at beam position monitor (BPM) locations per unit kick by corrector magnets, was measured and then analyzed using SVD. Ten BPMs, sixteen correctors, and the eight largest SVD eigenvalues were used for closed orbit correction. The maximum sampling frequency for the closed loop feedback was measured at 37 Hz. Using the proportional and integral (PI) control algorithm with the gains Kp = 3 and K{sub I} = 0.05 and the open-loop bandwidth corresponding to 1% of the sampling frequency, a correction bandwidth ({minus}3 dB) of approximately 0.8 Hz was achieved. Time domain measurements showed that the response time of the closed loop feedback system for 1/e decay was approximately 0.25 second. This result implies {approximately} 100 Hz correction bandwidth for the planned beam position feedback system for the Advanced Photon Source storage ring with the projected 4-kHz sampling frequency.

Authors:
; ;  [1]
  1. and others
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10171970
Report Number(s):
ANL/ASD/CP-81727; CONF-940618-25
ON: DE94016306; TRN: 94:015553
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Conference: EPAC 94 - 4. European particle accelerator conference,London (United Kingdom),27 Jun - 1 Jul 1994; Other Information: PBD: [1994]
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; SPEAR; CONTROL SYSTEMS; BEAM POSITION; PERFORMANCE; CONTROL; FEEDBACK; DATA ANALYSIS; ORBITS; CORRECTIONS; ADVANCED PHOTON SOURCE; BEAM BENDING MAGNETS; MOTION; BEAM OPTICS; EXPERIMENTAL DATA; 430400; 430200; 430300; STORAGE RINGS; BEAM DYNAMICS, FIELD CALCULATIONS, AND ION OPTICS; AUXILIARIES AND COMPONENTS

Citation Formats

Chung, Y, Kirchman, J, and Lenkszus, F. Closed orbit feedback with digital signal processing. United States: N. p., 1994. Web. doi:10.2172/10171970.
Chung, Y, Kirchman, J, & Lenkszus, F. Closed orbit feedback with digital signal processing. United States. https://doi.org/10.2172/10171970
Chung, Y, Kirchman, J, and Lenkszus, F. 1994. "Closed orbit feedback with digital signal processing". United States. https://doi.org/10.2172/10171970. https://www.osti.gov/servlets/purl/10171970.
@article{osti_10171970,
title = {Closed orbit feedback with digital signal processing},
author = {Chung, Y and Kirchman, J and Lenkszus, F},
abstractNote = {The closed orbit feedback experiment conducted on the SPEAR using the singular value decomposition (SVD) technique and digital signal processing (DSP) is presented. The beam response matrix, defined as beam motion at beam position monitor (BPM) locations per unit kick by corrector magnets, was measured and then analyzed using SVD. Ten BPMs, sixteen correctors, and the eight largest SVD eigenvalues were used for closed orbit correction. The maximum sampling frequency for the closed loop feedback was measured at 37 Hz. Using the proportional and integral (PI) control algorithm with the gains Kp = 3 and K{sub I} = 0.05 and the open-loop bandwidth corresponding to 1% of the sampling frequency, a correction bandwidth ({minus}3 dB) of approximately 0.8 Hz was achieved. Time domain measurements showed that the response time of the closed loop feedback system for 1/e decay was approximately 0.25 second. This result implies {approximately} 100 Hz correction bandwidth for the planned beam position feedback system for the Advanced Photon Source storage ring with the projected 4-kHz sampling frequency.},
doi = {10.2172/10171970},
url = {https://www.osti.gov/biblio/10171970}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 1994},
month = {Mon Aug 01 00:00:00 EDT 1994}
}