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Local measurement of error field using naturally rotating tearing mode dynamics in EXTRAP T2R
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-9546-4494
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-5259-0458
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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2016 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 58, no 12, 124001Article in journal (Refereed) Published
Abstract [en]

An error field (EF) detection technique using the amplitude modulation of a naturally rotating tearing mode (TM) is developed and validated in the EXTRAP T2R reversed field pinch. The technique was used to identify intrinsic EFs of m/n = 1/-12, where m and n are the poloidal and toroidal mode numbers. The effect of the EF and of a resonant magnetic perturbation (RMP) on the TM, in particular on amplitude modulation, is modeled with a first-order solution of the modified Rutherford equation. In the experiment, the TM amplitude is measured as a function of the toroidal angle as the TM rotates rapidly in the presence of an unknown EF and a known, deliberately applied RMP. The RMP amplitude is fixed while the toroidal phase is varied from one discharge to the other, completing a full toroidal scan. Using three such scans with different RMP amplitudes, the EF amplitude and phase are inferred from the phases at which the TM amplitude maximizes. The estimated EF amplitude is consistent with other estimates (e.g. based on the best EF-cancelling RMP, resulting in the fastest TM rotation). A passive variant of this technique is also presented, where no RMPs are applied, and the EF phase is deduced.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 58, no 12, 124001
Keyword [en]
error field, EXTRAP T2R, plasma, reversed field pinch, tearing mode, tokamak, Amplitude modulation, Magnetoplasma, Modulation, Pinch effect, Plasmas, Tearing modes, Errors
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-202888DOI: 10.1088/0741-3335/58/12/124001ScopusID: 2-s2.0-84997785038OAI: oai:DiVA.org:kth-202888DiVA: diva2:1079867
Note

QC 20170309

Available from: 2017-03-09 Created: 2017-03-09 Last updated: 2017-03-09Bibliographically approved

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Frassinetti, LorenzoBrunsell, Per R.Fridström, Richard
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