NDLI: Time variations of fields in superconducting magnets and their effects on accelerators

Content Provider	IEEE Xplore Digital Library
Author	Herrup, D.A. Syphers, M.J. Johnson, D.E. Johnson, R.P. Tollestrup, A.V. Hanft, R.W. Brown, B.C. Lamm, M.J. Kuchnir, M. McInturff, A.D.
Copyright Year	1965
Abstract	The time dependence of magnetic fields in the superconducting magnets of the Fermilab Tevatron is discussed. A field variation of order 1 G at the aperture radius is observed. Studies on both full-sized Tevatron dipoles and prototype magnets have been used to elucidate these effects. Explanations based on eddy currents in the coil matrix or on flux creep in the superconducting filaments are explored with these tests. Measurement results and techniques for controlling the effect based on novel laboratory tests and the latest accelerator operation are presented. It is shown that small but important changes in the fields occur with (ln t) time dependencies. For accelerator operation, in both laboratory and accelerator measurements, some events which might be associated with nonsmooth behavior (sudden changes on the relevant time scale) and with deviations at long times from observed (ln t) behavior have been seen.<>
Sponsorship	IEEE Magnetics Society
Starting Page	1643
Ending Page	1646
Page Count	4
File Size	476441
File Format	PDF
ISSN	00189464
Volume Number	25
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting magnets Magnetic field measurement Laboratories Magnetic fields Apertures Prototypes Eddy currents Superconducting coils Creep Superconducting materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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