Heat Treatment Optimizations for Wind-and-React Bi-2212 Racetrack Coils

Godeke, A.; Cheng, D. W.; Dietderich, D. R.; Mentink, M. G. T.; Prestemon, S. O.; Sabbi, G. L.

doi:10.1016/j.phpro.2012.06.047

Heat Treatment Optimizations for Wind-and-React Bi-2212 Racetrack Coils

Journal Article · Sat Sep 08 00:00:00 EDT 2012 · Physics Procedia

DOI:https://doi.org/10.1016/j.phpro.2012.06.047· OSTI ID:1602792

Godeke, A. ^[1]; Cheng, D. W. ^[1]; Dietderich, D. R. ^[1]; Mentink, M. G. T. ^[1]; Prestemon, S. O. ^[1]; Sabbi, G. L. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Lawrence Berkeley National Laboratory (LBNL) is developing Wind-and-React (W&R) Bi2sr2cacu2o8+δ (Bi-2212) accelerator magnet technology for insert coils, to surpass the intrinsic limitations of Nb-based magnets, and eventually develop hybrid systems that can approach 20 T dipole fields. The Bi-2212 technology is being developed in close collaboration with industry, and has been partly supported by the US Very High Field Superconducting Magnet Collaboration (VHFSMC). Steady improvements were made over the last several years, with coil HTS-SC08 reaching 2636 A, or about 85% of its witness sample critical current (Ic). Though this is still a factor 3 to 4 too low to be competitive with Nb-based materials, it is expected that the required Ic can be achieved through further conductor optimizations. Recent developments include the commissioning of infrastructure for the reaction of coils at LBNL. Earlier coils were fabricated and tested at LBNL, but were reacted at the wire manufacturer. We describe in detail the furnace calibrations and heat treatment optimizations that enable coil reactions at temperatures approaching 890 °C with a homogeneity of ± 1 °C in a pure oxygen flow. We reacted two new coils at LBNL, and tested the performance of coil HTS-SC10 at 4.2 K in self-field using a superconducting transformer system. We find that its performance is consistent with witness samples, and comparable to coil HTS-SC08, which is an identical coil that was reacted at Oxford Instruments Superconductor Technology (OST), thereby validating the in-house reaction process.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1602792

Journal Information:: Physics Procedia, Journal Name: Physics Procedia Journal Issue: C Vol. 36; ISSN 1875-3892

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Tripled critical current in racetrack coils made of Bi-2212 Rutherford cables with overpressure processing and leakage control Zhang, Kai; Higley, Hugh; Ye, Liyang Superconductor Science and Technology, Vol. 31, Issue 10 https://doi.org/10.1088/1361-6668/aada2f	journal	September 2018
Superior critical current of Symmetric Tape Round (STAR) REBCO wires in ultra-high background fields up to 31.2 T Luo, Wenbo; Kar, Soumen; Li, Xiaofen Superconductor Science and Technology, Vol. 31, Issue 12 https://doi.org/10.1088/1361-6668/aaebe8	journal	November 2018
Superconducting Materials and Conductors: Fabrication and Limiting Parameters Bottura, Luca; Godeke, Arno Reviews of Accelerator Science and Technology, Vol. 05 https://doi.org/10.1142/s1793626812300022	journal	January 2012

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