| Title: |
Development of a high current density, high temperature superconducting cable for pulsed magnets |
| Authors: |
Sanabria, Charlie; Radovinsky, Alexey; Craighill, Christopher; Uppalapati, Kiran; Warner, Alex; Colque, Julio; Allen, Elle; Evcimen, Sera; Heller, Sam; Chavarria, David; Metcalfe, Kristen; Lenzen, Saehan; Hubbard, Amanda; Watterson, Amy; Chamberlain, Sarah; Diaz-Pacheco, Rui; Weinreb, Benjamin; Brownell, Elizabeth; Nealey, Justin; Hughes, Annie; Laamanen, Eric; Vasudeva, Keshav; Nash, Daniel; McCormack, Colin; Salazar, Erica; Duke, Owen; Hicks, Matt; Adams, Jeremy; Kolb-Bond, Dylan; Liu, Timothy; Malhotra, Kara; Meichle, David P; Francis, Ashleigh; Cheng, JL; Shepard, Maise; Greenberg, Aliya; Fry, Vinny; Kostifakis, Nick; Avola, Carl; Ljubicic, Paul; Palmer, Lex; Sundar Rajan, Gayatri; Padukone, Ronak; Kuznetsov, Sergey; Donez, Kai; Golfinopoulos, Theodore; Michael, Philip C; Vieira, Rui; Martovetsky, Nicolai; Badcock, Rodney |
| Contributors: |
ARPA-E; Commonwealth Fusion Systems |
| Source: |
Superconductor Science and Technology ; volume 37, issue 11, page 115010 ; ISSN 0953-2048 1361-6668 |
| Publisher Information: |
IOP Publishing |
| Publication Year: |
2024 |
| Description: |
A low-AC loss Rare-earth barium copper oxide (REBCO) cable, based on the VIPER cable technology has been developed by commonwealth fusion systems for use in high-field, compact tokamaks. The new cable is composed of partitioned and transposed copper ‘petals’ shaped to fit together in a circular pattern with each petal containing a REBCO tape stack and insulated from each other to reduce AC losses. A stainless-steel jacket adds mechanical robustness—also serving as a vessel for solder impregnation—while a tube runs through the middle for cooling purposes. Additionally, fiber optic sensors are placed under the tape stacks for quench detection (QD). To qualify this design, a series of experiments were conducted as part of the SPARC tokamak central solenoid (CS) model coil program—to retire the risks associated with full-scale, fast-ramping, high-flux high temperature superconductors CS and poloidal field coils for tokamak fusion power plants and net-energy demonstrators. These risk-study and risk-reduction experiments include (1) AC loss measurement and model validation in the range of ∼5 T s −1 , (2) an IxB electromagnetic (EM) loading of over 850 kN m −1 at the cable level and up to 300 kN m −1 at the stack level, (3) a transverse compression resilience of over 350 MPa, (4) manufacturability at tokamak-relevant speeds and scales, (5) cable-to-cable joint performance, (6) fiber optic-based QD speed, accuracy, and feasibility, and (7) overall winding pack integration and magnet assembly. The result is a cable technology, now referred to as PIT VIPER, with AC losses that measure fifteen times lower (at ∼5 T s −1 ) than its predecessor technology; a 2% or lower degradation of critical current ( I c ) at high IxB EM loads; no detectable I c degradation up to 600 MPa of transverse compression on the cable unit cell; end-to-end magnet manufacturing, consistently producing I c values within 7% of the model prediction; cable-to-cable joint resistances at 20 K on the order of ∼15 nΩ ; and fast, functional QD ... |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| DOI: |
10.1088/1361-6668/ad7efc |
| DOI: |
10.1088/1361-6668/ad7efc/pdf |
| Availability: |
https://doi.org/10.1088/1361-6668/ad7efc; https://iopscience.iop.org/article/10.1088/1361-6668/ad7efc; https://iopscience.iop.org/article/10.1088/1361-6668/ad7efc/pdf |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; https://iopscience.iop.org/info/page/text-and-data-mining |
| Accession Number: |
edsbas.8595C72F |
| Database: |
BASE |