The importance of interfilamentary barrier resistance in YBCO coated conductor to minimize ac losses

2002 ◽  
Author(s):  
C. E. Oberly
Keyword(s):  
Ac Losses ◽  
Coated Conductor ◽  
Ybco Coated Conductor ◽  
Barrier Resistance

Thermal Conductivity Test of YBCO Coated Conductor Tape Stacks Interleaved With Insulated Stainless Steel Tapes

2012 ◽  
Vol 23 (3) ◽  
pp. 4600204-4600204 ◽  
Author(s):  
Hongyu Bai ◽  
W Markiewicz ◽  
Jun Lu ◽  
Hubertus Weijers
Keyword(s):  
Thermal Conductivity ◽  
Stainless Steel ◽  
Radial Direction ◽  
Sol Gel ◽  
Background Field ◽  
Ac Losses ◽  
Coated Conductor ◽  
Internal Cooling ◽  
Ybco Coated Conductor ◽  
Quench Propagation

A 32 Tesla, all-superconducting user magnet, which consists of two high temperature superconductor YBCO inner coils producing a field of 17 T in an low temperature superconductor Nb3Sn and NbTi outer magnet producing a background field of 15 T, is being developed at the National High Magnetic Field Laboratory. The YBCO inner coils are pancake-wound with YBCO coated conductor tapes with an interleaved insulation of sol-gel coated stainless steel tapes. The coils are to be cooled directly in liquid helium bath. Heat losses in the windings, such as ac losses during ramping and heat loss in the internal joints, are supposed to be transferred to the coil external surfaces through heat conduction. Thus, thermal conductivity of the coil structure is critical for the internal cooling of the coil and also quench propagation if any. Thermal conductivity measurements were carried out in the radial direction on stacks of alternating YBCO tapes and stainless steel tapes. This paper presents the test results that showed a very low thermal conductivity in the radial direction. For comparison purposes, calculated thermal conductivities in the axial and azimuthal direction are also presented.

scholarly journals Measurement of AC Losses in a Racetrack Superconducting Coil Made from YBCO Coated Conductor

2012 ◽  
Vol 36 ◽  
pp. 980-984 ◽  
Author(s):  
Eugen Seiler ◽  
Asger B. Abrahamsen ◽  
Ján Kováč ◽  
Mike Wichmann ◽  
Chresten Træholt
Keyword(s):  
Ac Losses ◽  
Coated Conductor ◽  
Ybco Coated Conductor ◽  
Superconducting Coil

Transport AC Losses of YBCO Coated Conductor Coils

2007 ◽  
Vol 1001 ◽  
Author(s):  
Francesco Grilli ◽  
Stephen P. Ashworth
Keyword(s):  
Coated Conductors ◽  
Ac Losses ◽  
Coated Conductor ◽  
Superconducting Tapes ◽  
Practical Applications ◽  
Superconducting Tape ◽  
Ybco Coated Conductor ◽  
The Magnetic Field ◽  
Ybco Coated Conductors ◽  
Transport Ac Losses

AbstractCertain practical applications of YBCO coated conductors (CC) involve superconducting tapes wound in coils. In such a configuration the superconducting tape is arranged as closely packed turns, leading to an increase of the magnetic field generated by the current in the tapes and, consequently, a significant increase in the AC losses, with respect to an ‘isolated’ tape. In order to predict and reduce the refrigeration requirements of applications, it is therefore very important to be able to quantify the magnitude of such AC losses, both experimentally and by means of numerical calculations.

Quantifying AC Losses in YBCO Coated Conductor Coils

2007 ◽  
Vol 17 (2) ◽  
pp. 3187-3190 ◽  
Author(s):  
Francesco Grilli ◽  
Stephen P. Ashworth
Keyword(s):  
Ac Losses ◽  
Coated Conductor ◽  
Ybco Coated Conductor

AC Losses in YBCO Coated Conductor With Inkjet Filaments

2007 ◽  
Vol 17 (2) ◽  
pp. 3159-3162 ◽  
Author(s):  
Robert C. Duckworth ◽  
M. Parans Paranthaman ◽  
M. S. Bhuiyan ◽  
Fred A. List ◽  
Michael J. Gouge
Keyword(s):  
Ac Losses ◽  
Coated Conductor ◽  
Ybco Coated Conductor

YBCO coated conductor by multiple-stage CVD

2005 ◽  
Vol 426-431 ◽  
pp. 887-892 ◽  
Author(s):  
N. Kashima ◽  
T. Niwa ◽  
M. Mori ◽  
S. Nagaya ◽  
T. Muroga ◽  
...  
Keyword(s):  
Coated Conductor ◽  
Ybco Coated Conductor
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