Global DC closed orbit correction experiments on the NSLS X-ray ring and SPEAR

Conference · Thu Jul 01 04:00:00 EDT 1993

OSTI ID:10176007

Chung, Y; Decker, G; Evans, K Jr ^[1]; Safranek, J; So, I; Tang, Y ^[2]; Corbett, W J; Hettel, R ^[3]

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1. Argonne National Lab., IL (United States)
2. Brookhaven National Lab., Upton, NY (United States)
3. Stanford Linear Accelerator Center, Menlo Park, CA (United States)

The global closed orbit correction experiments conducted on the NSLS X-my ring and the SPEAR using the technique of singular value decomposition (SVD) are presented. The beam response matrix, defined as beam motion at beam position monitor (BPM) locations per unit kick by correctors magnets, was measured and then analyzed using SVD. The BPMs and correctors are reconfigured into ``transformed`` BPMs (t-BPMs) and ``transformed`` correctors (t-correctors), with each t-BPM coupled to at most one t-corrector and vice versa for orbit correction. The decoupled t-BPMs are used to estimate the limit on orbit correction, while the decoupled t-correctors are used to optimize the corrector strengths. As a result, the vertical r.m.s. orbit error at the BPM locations was reduced from 208 {mu}m to 61 {mu}m about an arbitrary reference orbit in the NSLS X-ray ring. In SPEAR, the vertical closed, orbit was brought to the BPM centers at the selected BPM locations with an r.m.s. error of 215 {mu}m reduced from the initial 780 {mu}m.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10176007
• Report Number(s): ANL/ASD/CP--78334; CONF-930511--310; ON: DE93017697
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200
BEAM DYNAMICS
BEAM DYNAMICS, FIELD CALCULATIONS, AND ION OPTICS
BEAM MONITORS
BEAM POSITION
CORRECTIONS
FEEDBACK
ITERATIVE METHODS
MATRICES
NSLS
ORBITS
SPEAR