Eddy current control in the AGS Rapid Cycling Booster accelerator magnets

The Booster requires highly variable magnet cycles. When B/spl dot/ is large, eddy current induced sextupole, etc., in the dipole vacuum chamber (VC) is large, with a much smaller contribution from magnet ends. Simple passive coils excited automatically by transformer action cancel the B/spl dot/ in...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 30; no. 4; pp. 1714 - 1717
Main Authors Danby, G.T., Jackson, J.W., Spataro, C.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.07.1994
Institute of Electrical and Electronics Engineers
Subjects
Acceleration
Apertures
Automatic control
Coils
Cyclic accelerators and storage rings
Eddy currents
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
Iron
Magnetic variables control
Magnetization
Nuclear physics
Physics
Transfer functions
Virtual colonoscopy
Particle accelerator
Winding
Reviews
Accelerators
Vacuum chamber
Electromagnets
Magnets
Coil
Foucault current
Eddy current testing
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Summary:The Booster requires highly variable magnet cycles. When B/spl dot/ is large, eddy current induced sextupole, etc., in the dipole vacuum chamber (VC) is large, with a much smaller contribution from magnet ends. Simple passive coils excited automatically by transformer action cancel the B/spl dot/ induced sextupole. A self correction coil is not required for the quadrupoles, since B/spl dot/ induced aberrations are very small (<1.0/spl times/10/sup -4/ at full aperture). Iron magnetization does not produce dipole or quadrupole magnet multipole aberrations, so these magnets have been effectively made independent of unwanted multipoles for all cycles. However, variations in the transfer functions and thus the Booster tune have not been automatically eliminated. Iron magnetization contributions are almost matched, but the B/spl dot/ induced field retardation in the dipoles VC is larger than in the quadrupoles. Results of measurements will be presented, plus a simple system to overcome the mismatch and make the tune independent of B/spl dot/. Properties of special lattice magnets and their corrections will also be described.< >
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9464
1941-0069
DOI:10.1109/20.305586