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Title: Permanent-magnet multipole with adjustable strength

Two or more magnetically soft pole pieces are symmetrically positioned along a longitudinal axis to provide a magnetic field within a space defined by the pole pieces. Two or more permanent magnets are mounted to an external magnetically-soft cylindrical sleeve which rotates to bring the permanent magnets into closer coupling with the pole pieces and thereby adjustably control the field strength of the magnetic field produced in the space defined by the pole pieces. The permanent magnets are preferably formed of rare earth cobalt (REC) material which has a high remanent magnetic field and a strong coercive force. The pole pieces and the permanent magnets have corresponding cylindrical surfaces which are positionable with respect to each other to vary the coupling there between. Auxiliary permanent magnets are provided between the pole pieces to provide additional magnetic flux to the magnetic field without saturating the pole pieces.
Authors:
Publication Date:
OSTI Identifier:
5824590
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; PERMANENT MAGNETS; DESIGN; MULTIPOLES; COBALT ALLOYS; MAGNET POLE PIECES; MAGNETIC MATERIALS; RARE EARTH ALLOYS; ALLOYS; MAGNETS; MATERIALS 430300* -- Particle Accelerators-- Auxiliaries & Components