NDLI: HTS Magnetic Field Damper for Short-Term Fluctuations in the Driven-Mode

Content Provider	IEEE Xplore Digital Library
Author	Otsuka, A. Kiyoshi, T. Matsumoto, S.
Copyright Year	2002
Abstract	Although high-temperature superconductors (HTS) are very promising for high-field generation over 25 Tesla, it is difficult to apply them to an NMR magnet because of their low index values and the difficulty caused by superconducting joints. The properties of HTS appear to cause poor magnetic field stability in the persistent-mode operation. Therefore, in this study, a high-field NMR magnet including HTS coils will be operated in the driven-mode. We evaluated the magnetic field drift of a 14 Tesla (600 MHz) NMR magnet in the driven-mode. The magnetic field stability in several hours was about 2 ppm. However, in a shorter-term, magnetic field fluctuations with a main period of approximately 0.01 Hz remained. These fluctuations are unfavorable for a precise NMR measurement. In order to reduce the field fluctuation, we tested the damper coil by making a closed-loop circuit using Bi-2223 tapes. The damper coil was cooled by a single-stage GM cryocooler in the magnetic field. The inside magnetic field of the damper coil was measured with an NMR Teslameter. The shielding current in the damper coil canceled out the field fluctuation, which indicates that the damper coil worked effectively.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	848
Ending Page	851
Page Count	4
File Size	530111
File Format	PDF
ISSN	10518223
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High temperature superconductors Magnetic fields Fluctuations Magnetic field measurement Nuclear magnetic resonance Superconducting magnets Superconducting coils Circuit testing Magnetic shielding Shock absorbers NMR magnet Damper coil driven-mode HTS magnetic field fluctuation magnetic field stability
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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