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A multi-machine scaling of halo current rotation
Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA..
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.ORCID iD: 0000-0002-9546-4494
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Number of Authors: 12292018 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 58, no 1, article id 016050Article in journal (Refereed) Published
Abstract [en]

Halo currents generated during unmitigated tokamak disruptions are known to develop rotating asymmetric features that are of great concern to ITER because they can dynamically amplify the mechanical stresses on the machine. This paper presents a multi-machine analysis of these phenomena. More specifically, data from C-Mod, NSTX, ASDEX Upgrade, DIII-D, and JET are used to develop empirical scalings of three key quantities: (1) the machine-specific minimum current quench time, tau(CQ); (2) the halo current rotation duration, trot; and (3) the average halo current rotation frequency, < f(h)>. These data reveal that the normalized rotation duration, t(rot)/tau(CQ), and the average rotation velocity, < v(h)>, are surprisingly consistent from machine to machine. Furthermore, comparisons between carbon and metal wall machines show that metal walls have minimal impact on the behavior of rotating halo currents. Finally, upon projecting to ITER, the empirical scalings indicate that substantial halo current rotation above < f(h)> = 20 Hz is to be expected. More importantly, depending on the projected value of tau(CQ) in ITER, substantial rotation could also occur in the resonant frequency range of 6-20 Hz. As such, the possibility of damaging halo current rotation during unmitigated disruptions in ITER cannot be ruled out.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 58, no 1, article id 016050
Keywords [en]
tokamak, disruptions, halo currents
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-270535DOI: 10.1088/1741-4326/aa958bISI: 000417910800001Scopus ID: 2-s2.0-85038867048OAI: oai:DiVA.org:kth-270535DiVA, id: diva2:1415152
Note

QC 20200317

Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-05-11Bibliographically approved

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Bergsåker, HenricBykov, IgorFrassinetti, LorenzoGarcia-Carrasco, AlvaroHellsten, TorbjörnJohnson, ThomasMenmuir, SheenaPetersson, PerRachlew, ElisabethRatynskaia, SvetlanaRubel, MarekStefanikova, EsteraStröm, PetterTholerus, EmmiTolias, PanagiotisOlivares, Pablo VallejosWeckmann, ArminZhou, Yushun
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