Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 31, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/aad225
Keywords
high field magnets; no insulation winding; metal-as-insulation winding; pancake coil
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Funding
- LNCMI-CNRS
- French National Research Agency (ANR) [ANR-10-LABX-51-01, ANR-14-CE05-0005]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE05-0005] Funding Source: Agence Nationale de la Recherche (ANR)
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The aim of the NOUGAT project is to design and realize a 10 T high temperature superconducting solenoidal insert able to operate in a 20 T background magnetic induction. Our design is based on the metal-as-insulation winding technique consisting of co-winding a bare REBCO high temperature superconducting tape with a stainless steel tape. The metal-asinsulation winding maintains the self-protection feature of the no insulation winding and helps to reduce current charging time constants-one of the major drawbacks of no insulation coils-by significantly increasing the turn-to-turn electrical resistance. First, we demonstrated the self-quench protective behavior at 4.2 K under a high field up to 17 T by testing a single-pancake prototype. Then, before fabricating the final insert, we designed, wound and tested a second prototype made of two double-pancakes. The purposes were three-fold: validating the winding and assembly process, confirming the operating margins and corroborating the mechanical study. In this article, we present the main results of the tests performed at 4.2 K on this sub-scale prototype in a high background magnetic field at Laboratoire National des Champs Magnetiques Intenses at Grenoble.
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