Studies of time dependence of fields in Tevatron superconducting dipole magnets

The time variation in the magnetic field of a model Tevatron dipole magnet at constant excitation current has been studied. Variations in symmetry allowed harmonic components over long time ranges show a log t behavior indicative of 'flux creep'. Both short-time-range and long-time-range b...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-03, Vol.25 (2), p.1647-1651
Main Authors: Hanft, R.W., Brown, B.C., Herrup, D.A., Lamm, M.J., McInturff, A.D., Syphers, M.J.
Format: Article
Language:English
Subjects:
Accelerator magnets
Critical current
Gaussian processes
Iron
Magnetic fields
Packaging
Superconducting cables
Superconducting coils
Superconducting epitaxial layers
Superconducting magnets
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Summary:The time variation in the magnetic field of a model Tevatron dipole magnet at constant excitation current has been studied. Variations in symmetry allowed harmonic components over long time ranges show a log t behavior indicative of 'flux creep'. Both short-time-range and long-time-range behavior depend on the excitation history. Similar effects are seen in the remnant fields present in full-scale Tevatron dipoles following current ramping. Both magnitudes and time dependences are observed to depend on details such as ramp rate, flattop duration, and number of ramps. In a few magnets, variations are also seen in symmetry-disallowed harmonics.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92616