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dc.contributor.authorDevitre, Alexis
dc.contributor.authorFischer, David
dc.contributor.authorRiva, N.
dc.contributor.authorRae, M.
dc.contributor.authorKortman, Lauryn
dc.contributor.authorWoller, Kevin
dc.contributor.authorFisher, Zoe
dc.contributor.authorShort, Michael
dc.contributor.authorWhyte, Dennis
dc.contributor.authorHartwig, Zachary
dc.date.accessioned2024-12-16T20:28:50Z
dc.date.available2024-12-16T20:28:50Z
dc.date.issued2024-12-02
dc.identifier.issn1361-6668
dc.identifier.urihttps://hdl.handle.net/1721.1/157858
dc.description.abstractReports of critical current (Ic) suppression during cryogenic ion irradiation of REBCO tapes have raised concerns for the operational margins of fusion power plant (FPP) magnets. However, the data remain inconclusive regarding beam heating due to the difficulty of measuring local temperatures with contact probes. This leaves a critical knowledge gap concerning the mechanism behind Ic suppression, and whether the so-called beam on effect is to be expected under neutron irradiation during FPP operation. In this paper, we show that Ic suppression is independent of atomic displacement rate in the REBCO layer, the latter of which increases twelve-fold as we reduce the beam energy from 2400 to 800 keV. At fixed power, we observe statistically identical suppression with 150 keV protons, which do not have enough energy to reach the REBCO layer, refuting hypotheses about beam on effects being caused by nuclear displacements or direct ion-Cooper pair interactions. These results show that REBCO temperature rise alone can explain Ic suppression, leaving little to no margin for alternative mechanisms. With this insight, we developed a method to measure beam spot temperature that does not depend on the specific installation of our temperature sensor. With this new method, we measured the temperature gradient across the tape during irradiation and found that thermal resistance at the tape/target interface is the controlling variable in Ic suppression. As such, accelerator-based facilities aiming to reproduce the operation of REBCO magnets in a nuclear fusion environment should find strategies to minimize interface thermal resistance. Most importantly, we find that the dose rates expected in a FPP will not change Ic due to ballistic radiation damage or ion-Cooper pair interactions, allowing us to safely ignore these effects when designing FPP magnets.en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttps://doi.org/10.1088/1361-6668/ad95c2en_US
dc.rightsCreative Commons Attribution-Noncommercial-ShareAlikeen_US
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/en_US
dc.sourceAuthoren_US
dc.titleBeam heating explains critical current suppression measured during ion irradiation of REBCO tapesen_US
dc.typeArticleen_US
dc.identifier.citationA R Devitre et al 2025 Supercond. Sci. Technol. 38 015005en_US
dc.contributor.departmentMassachusetts Institute of Technology. Plasma Science and Fusion Centeren_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineeringen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Materials Science and Engineeringen_US
dc.relation.journalSuperconductor Science and Technologyen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.date.submission2024-12-16T20:24:33Z
mit.journal.volume38en_US
mit.licenseOPEN_ACCESS_POLICY
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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