Closed orbit feedback with digital signal processing

Technical Report · Mon Aug 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10171970· OSTI ID:10171970

Chung, Y; Kirchman, J; Lenkszus, F ^[1]

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1. and others

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.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10171970
• Report Number(s): ANL/ASD/CP--81727; CONF-940618--25; ON: DE94016306
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200
430300
430400
ADVANCED PHOTON SOURCE
AUXILIARIES AND COMPONENTS
BEAM BENDING MAGNETS
BEAM DYNAMICS, FIELD CALCULATIONS, AND ION OPTICS
BEAM OPTICS
BEAM POSITION
CONTROL
CONTROL SYSTEMS
CORRECTIONS
DATA ANALYSIS
EXPERIMENTAL DATA
FEEDBACK
MOTION
ORBITS
PERFORMANCE
SPEAR
STORAGE RINGS