Influence of Pre-Excitation, High Temperature Magnetization and Combined Excitation Method on Screening Current Attenuation in Conduction-Cooled REBCO Coil

This paper investigated a suitable excitation method for a conduction-cooled REBCO coil to reduce the temporal attenuation of the screening current induced field (screening field) for MRI. We investigated the effect of the pre-excitation of the coil and high temperature magnetization method on the s...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2020-02, p.1-1
Main Authors: Nagasaki, Yoh, Miyazaki, Jun, Kanamaru, Masatoshi, Miyagi, Daisuke, Tsuda, Makoto, Miura, Hideaki, Yokoyama, Shoichi
Format: Article
Language:English
Subjects:
Attenuation
High temperature magnetization
High-temperature superconductors
HTS coils
Magnetic flux density
Magnetic resonance imaging
Magnetization
Overshooting currents
Screening currents
Temperature
Temperature measurement
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Summary:This paper investigated a suitable excitation method for a conduction-cooled REBCO coil to reduce the temporal attenuation of the screening current induced field (screening field) for MRI. We investigated the effect of the pre-excitation of the coil and high temperature magnetization method on the screening field attenuation by measuring the variation rate of the magnetic field at the side surface of a conduction-cooled REBCO double pancake coil. Experimental results showed that the pre-excitation of the coil and high temperature magnetization increased the temporal stability of the coil magnetic field when the pre-excitation current is higher than the main operational current, or the temperature change of the high temperature magnetization is over 5 K, respectively. We also clarified that the combination of the pre-excitation, overshooting, and high temperature magnetization method greatly suppressed the attenuation of the screening field and also the load factor of the coil than in the case when only the high temperature magnetization is applied.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2020.2976590