Vacuum chamber eddy current self-correction for the AGS Booster Accelerator

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5676540

Danby, G T; Jackson, J W

The large sextupole and other multipoles induced by eddy currents in the vacuum chamber (VC) designed for the AGS Booster dipoles have been cancelled by simple coils attached to the VC surface. A two turns per pole back leg winding provides the mmf required to power the correction coil by transformer action, automatically correcting even for the variable {dot B} magnet excitation. Much larger VC positional errors of translation and rotation are acceptable because the coils follow the VC contour: the aberrations and their corrections locally have the same misplaced coordinate system. The self-correction concept could be applied to quadrupoles. However, Booster quadrupole measurements show that induced higher harmonics from VC and other eddy current sources are very small. Thus, with self-correction of the dipole VC eddy current fields, {dot B} effects on the proton rapid cycling Booster optics are reduced to tracking of the fundamental dipole and quadrupole fields. This can be automatically controlled using field monitoring transducers located in a dipole and quadrupole operated in series with the Booster magnets. 2 refs., 4 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5676540
• Report Number(s): BNL-42465; CONF-890803--30; ON: DE90001325
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430100 -- Particle Accelerators-- Design
Development
& Operation
430400* -- Particle Accelerators-- Storage Rings
ACCELERATORS
BEAM BENDING MAGNETS
BROOKHAVEN AGS
CORRECTIONS
CURRENTS
CYCLIC ACCELERATORS
DESIGN
EDDY CURRENTS
ELECTRIC COILS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNET COILS
MAGNETIC FIELDS
MAGNETS
PARTICLE BOOSTERS
SYNCHROTRONS
VACUUM SYSTEMS