Open loop compensation for the eddy current effect in the APS storage ring vacuum chamber

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5724044

Chung, Y; Bridges, J; Emery, L; Decker, G

In the third generation synchrotron light sources, closed orbit stabilization against external vibrations is critical to ensure low emittance and high brightness. The Advanced Photon Source (APS) will use a large number (678) of correction magnets to create local bumps and to achieve global orbit stabilization. In this paper, we will present the result of the effort to counter the effect due to the finite inductance of the magnet and the eddy current in the 1/2 in.-thick aluminum storage ring vacuum chamber. The amplitude attenuation and the phase shift of the correction magnet field inside the APS storage ring vacuum chamber were measured. A circuit to compensate for this effect was then inserted between the signal source and the magnet power supply. The amplitude was restored with an error of less than 20% of the source signal amplitude and the phase shift was reduced from 80{degrees} to 12{degrees} at 10 Hz. Incorporation of this circuit in the closed loop feedback scheme and the resulting beneficial effect in the closed orbit stabilization will be discussed. 4 refs., 4 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5724044
• Report Number(s): ANL/CP-73052; CONF-910505--45; ON: DE91011997
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
BEAM MONITORING
BEAM POSITION
CONTAINERS
CORRECTIONS
CURRENTS
DIPOLES
EDDY CURRENTS
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
EQUIPMENT
MAGNETIC DIPOLES
MAGNETIC FIELDS
MONITORING
MULTIPOLES
ORBITS
PHASE SHIFT
POWER SUPPLIES
PRESSURE VESSELS
RADIATION SOURCES
STORAGE RINGS
SYNCHROTRON RADIATION SOURCES