NDLI: Passive persistent current correctors for accelerator magnets

Content Provider	IEEE Xplore Digital Library
Author	Gurol, H. Albert, G.W. Simon, R.
Copyright Year	2002
Abstract	Persistent currents in the superconducting material of conductors in superconducting particle accelerator magnets produce large nonuniformities in the magnetic field at low (injection) fields. The purpose of this paper is to discuss a simple, passive approach to reduce the multipole content of accelerator magnets at low magnetic fields. Calculations were performed to determine methods of reducing the b/sub 2/, b/sub 4/, and b/sub 6/ multipoles. Thin nickel strips are added at precise locations along the outer surface of the beam tube in the magnet. The length of the strips is about 1 meter. Magnetization of the nickel counters the multipoles caused by the persistent currents up to about 2 T. A sample beam tube was prepared with nickel strips and inserted into a prototype collider dipole magnet (CDM) cold mass. The magnet was tested warm at currents up to 30 amperes. Measurements of radial flux density were performed at a series of points along the inner surface of the beam tube to assess the effect of the nickel strips. The test results were compared with predicted values from a finite element model of the magnet. The corrector strips are found to correct the field nonuniformities, in qualitative agreement with calculated results.<>
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	861
Ending Page	866
Page Count	6
File Size	412836
File Format	PDF
ISSN	10518223
Volume Number	5
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Persistent currents Accelerator magnets Strips Nickel Superconducting materials Magnetic fields Testing Conducting materials Superconducting magnets Linear particle accelerator
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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