Characterization and equalization of the AC responses of the corrector magnets for the APS local orbit feedback system

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:543624

Doose, C; Kim, S H

Local feedback for the APS storage ring uses local bumps to control the position and angle of the positron beam through each x-ray source point. Induced eddy currents in the aluminum vacuum chamber dominate the AC characteristics of the corrector magnetic fields. Small differences in the geometries at each magnet location change the eddy current effects and result in bump closure errors which must be reduced in order to minimize the coupling between each of the many local loops and the global control loop. By a combination of flux-damping coils, flux-shielding copper sheets, and a set of steel laminations for end-flux clamping, the differences of the eddy current effects between two corrector magnets were reduced from 0.18 Gm/A to 0.035 Gm/A in the frequency span of 0.1-100 Hz.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 543624
• Report Number(s): ANL/ASD/CP--92292; CONF-970503--; ON: DE97053291
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ADVANCED PHOTON SOURCE
BEAM DYNAMICS
CORRECTIONS
FEEDBACK
FREQUENCY DEPENDENCE
MAGNETS
ORBITS