002759594 001__ 2759594
002759594 003__ SzGeCERN
002759594 005__ 20210409172908.0
002759594 0247_ $$2DOI$$9IOP$$a10.1088/1361-6668/abdba8
002759594 0248_ $$aoai:inspirehep.net:1847003$$pcerncds:CERN$$qForCDS
002759594 035__ $$9http://old.inspirehep.net/oai2d$$aoai:inspirehep.net:1847003$$d2021-03-30T17:32:55Z$$h2021-03-31T04:00:08Z$$mmarcxml
002759594 035__ $$9Inspire$$a1847003
002759594 041__ $$aeng
002759594 100__ $$aSalazar, Erica E$$jORCID:0000-0003-3011-9013$$mericasal@mit.edu$$uMIT, Cambridge, CTP
002759594 245__ $$9IOP$$aFiber optic quench detection for large-scale HTS magnets demonstrated on VIPER cable during high-fidelity testing at the SULTAN facility
002759594 260__ $$c2021
002759594 300__ $$a18 p
002759594 520__ $$9IOP$$aFiber-optic thermometry has the potential to provide rapid and reliable quench detection for emerging large-scale, high-field superconducting magnets fabricated with high-temperature-superconductor (HTS) cables. Developing non-voltage-based quench detection schemes, such as fiber Bragg grating (FBG) technology, are particularly important for applications such as magnetic fusion devices where a high degree of induced electromagnetic noise impose significant challenges on traditional voltage-based quench detection methods. To this end, two fiber optic quench detection techniques—FBG and ultra-long FBG (ULFBG)—were incorporated into two vacuum pressure impregnated, insulated, partially transposed, extruded, and roll-formed (VIPER) high-current HTS cables and tested in the SULTAN facility, which provides high-fidelity operating conditions to large-scale superconducting magnets. During surface heater induced quench-like events under a variety of operating conditions, FBG and ULFBG demonstrated strong signal-to-noise ratios (SNRs) ranging from 4 to 32 and measured single-digit temperature excursions; both the SNR and temperature sensitivity increase with temperature. Fiber thermal response times ranged between effectively instantaneous to a few seconds depending on the operating temperature. Strain sensitivity dominates the thermal sensitivity in the conditions achievable at SULTAN; however, measurements at higher quench evolution temperatures, coupled to future work to increase the thermal-to-strain signal, show promise for quench detection capability in full-scale magnets where temperature and strain may occur simultaneously. Overall, FBG and ULFBG were proven capable to quickly and reliably detect small temperature disturbances which induced quench initiation events for high current VIPER HTS conductors in realistic operating conditions, motivating further work to develop FBG and ULFGB quench detection systems for full-scale HTS magnets.
002759594 540__ $$3publication$$aCC-BY-4.0$$uhttps://creativecommons.org/licenses/by/4.0/
002759594 542__ $$3publication$$f© 2021 The Authors. Published by IOP Publishing Ltd
002759594 65017 $$2SzGeCERN$$aAccelerators and Storage Rings
002759594 690C_ $$aCERN
002759594 700__ $$aBadcock, Rodney A$$jORCID:0000-0003-0219-9570$$uVictoria U., Wellington
002759594 700__ $$aBajko, Marta$$uCERN
002759594 700__ $$aCastaldo, Bernardo$$jORCID:0000-0001-7815-9802$$uCERN
002759594 700__ $$aDavies, Mike$$jORCID:0000-0003-4841-5830$$uVictoria U., Wellington
002759594 700__ $$aEstrada, Jose$$uMIT, Cambridge, CTP
002759594 700__ $$aFry, Vincent$$jORCID:0000-0002-1110-0563$$uMIT, Cambridge, CTP
002759594 700__ $$aGonzales, Jofferson T$$uVictoria U., Wellington
002759594 700__ $$aMichael, Philip C$$jORCID:0000-0003-4906-6169$$uMIT, Cambridge, CTP
002759594 700__ $$aSegal, Michael$$uUnlisted, US, MA
002759594 700__ $$aVieira, Rui F$$uMIT, Cambridge, CTP
002759594 700__ $$aHartwig, Zachary S$$jORCID:0000-0003-4248-7876$$uMIT, Cambridge, CTP
002759594 773__ $$c035027$$n3$$pSupercond. Sci. Technol.$$v34$$y2021
002759594 960__ $$a13
002759594 980__ $$aARTICLE