TY - JOUR
T1 - Influence of Preexcitation, High Temperature Magnetization and Combined Excitation Method on Screening Current Attenuation in Conduction-Cooled REBCO Coil
AU - Nagasaki, Yoh
AU - Miyazaki, Jun
AU - Kanamaru, Masatoshi
AU - Miyagi, Daisuke
AU - Tsuda, Makoto
AU - Miura, Hideaki
AU - Yokoyama, Shoichi
N1 - Funding Information:
Manuscript received March 2, 2019; revised October 3, 2019; accepted February 13, 2020. Date of publication February 27, 2020; date of current version March 13, 2020. This work was supported in part by the “Development of Medical Devices and Systems for Advanced Medical Services” from the Ministry of Economy, Trade and Industry, in part by the Japan Agency for Medical Research and Development, and in part by the New Energy and Industrial Technology Development Organization. This article was recommended by Associate Editor L. Chiesa. (Corresponding author: Yoh Nagasaki.) Yoh Nagasaki, Jun Miyazaki, Masatoshi Kanamaru, and Makoto Tsuda are with the Department of Electrical Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan (e-mail: nagasaki@ecei.tohoku.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2020/8
Y1 - 2020/8
N2 - This article 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 magnetic resonance imaging. We investigated the effect of the preexcitation 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 rare-earth barium copper oxide double pancake coil. Experimental results showed that the preexcitation of the coil and high temperature magnetization increased the temporal stability of the coil magnetic field when the preexcitation 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 preexcitation, 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.
AB - This article 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 magnetic resonance imaging. We investigated the effect of the preexcitation 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 rare-earth barium copper oxide double pancake coil. Experimental results showed that the preexcitation of the coil and high temperature magnetization increased the temporal stability of the coil magnetic field when the preexcitation 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 preexcitation, 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.
KW - High temperature magnetization
KW - high temperature superconducting (HTS) coils
KW - magnetic resonance imaging (MRI)
KW - overshooting currents
KW - screening currents
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U2 - 10.1109/TASC.2020.2976590
DO - 10.1109/TASC.2020.2976590
M3 - Article
AN - SCOPUS:85082397230
SN - 1051-8223
VL - 30
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 5
M1 - 9016127
ER -