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Scaling of the MHD perturbation amplitude required to trigger a disruption and predictions for ITER
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-7741-3370
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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Number of Authors: 11172016 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 56, no 2, article id 026007Article in journal (Refereed) Published
Abstract [en]

The amplitude of locked instabilities, likely magnetic islands, seen as precursors to disruptions has been studied using data from the JET, ASDEX Upgrade and COMPASS tokamaks. It was found that the thermal quench, that often initiates the disruption, is triggered when the amplitude has reached a distinct level. This information can be used to determine thresholds for simple disruption prediction schemes. The measured amplitude in part depends on the distance of the perturbation to the measurement coils. Hence the threshold for the measured amplitude depends on the mode location (i.e. the rational q-surface) and thus indirectly on parameters such as the edge safety factor, q(95), and the internal inductance, li(3), that determine the shape of the q-profile. These dependencies can be used to set the disruption thresholds more precisely. For the ITER baseline scenario, with typically q(95) = 3.2, li(3) = 0.9 and taking into account the position of the measurement coils on ITER, the maximum allowable measured locked mode amplitude normalized to engineering parameters was estimated to be a.B-ML(r

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2016. Vol. 56, no 2, article id 026007
Keywords [en]
disruptions, locked modes, MHD instabilities, ITER
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-272034DOI: 10.1088/0029-5515/56/2/026007ISI: 000367934800007Scopus ID: 2-s2.0-84957002589OAI: oai:DiVA.org:kth-272034DiVA, id: diva2:1424058
Note

QC 20200420

Available from: 2020-04-16 Created: 2020-04-16 Last updated: 2020-04-20Bibliographically approved

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