Test of Superconducting Wires and Rutherford Cables With High Specific Heat

High-field accelerator magnets made of state-of-the-art Nb 3 Sn Rutherford cables demonstrate relatively long trainings due to sudden heat depositions originated by thermo-mechanical perturbations in the magnet coils. Coil sensitivity to these perturbations can be reduced by increasing the specific...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2021-08, Vol.31 (5), p.1-8
Main Authors: Barzi, E., Novitsky, I., Rusy, A., Turrioni, D., Zlobin, A. V., Peng, X., Tomsic, M.
Format: Article
Language:English
Subjects:
Cables
critical current
Current measurement
Feasibility studies
Heating systems
Insulation
Magnet coils
Magnets
Minimum quench energy
Nb3Sn
Nb<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX"> 3</tex-math> </inline-formula> </named-content>Sn
NbTi
Niobium base alloys
PARTICLE ACCELERATORS
Perturbation
Rutherford cable
Specific heat
Strain measurement
Superconducting cables
Superconducting magnets
Superconducting tapes
Voltage measurement
Wire
Wires
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Summary:High-field accelerator magnets made of state-of-the-art Nb 3 Sn Rutherford cables demonstrate relatively long trainings due to sudden heat depositions originated by thermo-mechanical perturbations in the magnet coils. Coil sensitivity to these perturbations can be reduced by increasing the specific heat, C p , of major coil components - strands, or whole cable, or epoxy. The R&D on all these three approaches is in progress. This paper studies feasibility of increasing the C p of Rutherford-type cables by using a thin composite Cu/Gd 2 O 3 tape. The tape can be either wrapped around the cable, placed on the cable wide faces under the insulation, and/or inserted as a core. Cu/Gd 2 O 3 ribbons with ∼30% of Gd 2 O 3 powder and two different thicknesses were produced by Hyper Tech Research, Inc. Wire and cable samples outfitted with these high- C p ribbons, or tapes, were prepared and tested at FNAL for the Minimum Quench Energy ( MQE ). At 80% I c , the MQE gain average over the tested magnetic field range of the NbTi cable with high- C p tape on both sides was ∼1.3. The MQE gain average of the NbTi wire wrapped with the high- C p ribbon was 3.1.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2021.3069047