AC losses in YBCO coated conductors carrying AC transport currents in perpendicular AC external magnetic field

2003 ◽  
Vol 13 (2) ◽  
pp. 1735-1738 ◽  
Author(s):  
J. Ogawa ◽  
M. Shiokawa ◽  
M. Ciszek ◽  
O. Tsukamoto
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Coated Conductors ◽  
Ac Losses ◽  
Ybco Coated Conductors

AC Loss Characteristics of Stacks of YBCO Coated Conductors

2006 ◽  
Vol 946 ◽  
Author(s):  
Francesco Grilli ◽  
Stephen P. Ashworth ◽  
Svetlomir Stavrev
Keyword(s):  
Magnetic Field ◽  
Transport Current ◽  
Point Of View ◽  
Coated Conductors ◽  
Ac Loss ◽  
Ac Losses ◽  
Practical Applications ◽  
Superconducting Coils ◽  
Loss Characteristic ◽  
Ybco Coated Conductors

ABSTRACTPractical applications of YBCO coated conductors (CC) involving superconducting coils will utilize tapes packed together in an arrangement resembling a vertical stack. In such configuration there is an important electromagnetic interaction between the tapes, which strongly influences the loss characteristic of the device.In the presence of an external magnetic field, the losses are reduced compared to an isolated tape because of the reduced aspect ratio of the conductor and, at least for low fields, because of an effective screening of the central part of the stack. On the contrary, in the case of AC transport current, the losses tend to increase due to the enhancement of the local field caused by the interaction of the self-field produced by neighboring tapes. In practical situations the conductor is usually subjected to both transport current and magnetic field, so that there is a trade-off between the two effects.In this paper we investigate, both experimentally and by means of finite-element method calculations, the ac loss behavior of a stack composed by a finite number of tapes in different working conditions, and we compare the AC losses to the ones of non-interacting tapes in order to determine if the use of stacked tapes is advantageous from the point of view of power dissipation.

AC losses of Ag-(Bi,Pb)SrCaCuO-2223 tapes in combination of transverse external magnetic field and transport current

1995 ◽  
Vol 5 (2) ◽  
pp. 709-712 ◽  
Author(s):  
M. Ciszek ◽  
B.A. Glowacki ◽  
S.P. Ashworth ◽  
A.M. Campbell ◽  
J.E. Evetts
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Transport Current ◽  
Ac Losses

Influence of External Magnetic Field on AC Losses at EF Coil Joints of JT-60SA

2012 ◽  
Vol 22 (3) ◽  
pp. 4704604-4704604 ◽  
Author(s):  
T. Takao ◽  
K. Nakamura ◽  
T. Takagi ◽  
N. Tanoue ◽  
H. Murakami ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Ac Losses

AC losses in YBCO coated conductors subjected to tensile stresses

2006 ◽  
Vol 19 (6) ◽  
pp. 445-448 ◽  
Author(s):  
O Tsukamoto ◽  
N Sekine ◽  
H Suzuki ◽  
K Yamagishi ◽  
J Ogawa
Keyword(s):  
Coated Conductors ◽  
Ac Losses ◽  
Tensile Stresses ◽  
Ybco Coated Conductors

Double disordered YBCO coated conductors of industrial scale: high currents in high magnetic field

2015 ◽  
Vol 28 (11) ◽  
pp. 114007 ◽  
Author(s):  
D Abraimov ◽  
A Ballarino ◽  
C Barth ◽  
L Bottura ◽  
R Dietrich ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Coated Conductors ◽  
Industrial Scale ◽  
Ybco Coated Conductors

Observations from the Analyses of Magnetic Field and AC Loss Distributions in the NHMFL 32 T All-Superconducting Magnet HTS Insert

2013 ◽  
Vol 23 (3) ◽  
pp. 4300704-4300704 ◽  
Author(s):  
Andrew Gavrilin ◽  
Jun Lu ◽  
Hongyu Bai ◽  
David Hilton ◽  
W Markiewicz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Superconducting Magnet ◽  
Coated Conductors ◽  
Ac Loss ◽  
Ac Losses ◽  
Magnet System ◽  
Field Gradients ◽  
The Magnetic Field ◽  
Helium Vapor

A 17 T high-temperature superconducting two-coil magnet (insert) to be operated in a 15 T low-temperature superconducting multisection magnet (outsert) is the most demanding part of the National High Magnetic Field Laboratory all-superconducting 32 T magnet system. The HTS coils are of the pancake type and to be wound with REBCO coated conductors/tapes manufactured by SuperPower, Inc. The distribution of AC losses in the HTS windings during the magnet charging/discharging process are computed and analyzed with due regard for the AC loss density dependence on the magnetic field and the field angle. The calculations are based on the measured magnetization of a representative sample against magnetic field and field angle. The results enable determination of heat load on the magnet and its cryogenic system. Since the magnet is of the pool-cooled type, a related helium vapor bubble problem can develop owing to the high field and field gradients, and the diamagnetic susceptibility of helium.

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