Diagnostic application of magnetic islands rotation in JETVise andre og tillknytning
Rekke forfattare: 11142016 (engelsk)Inngår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 56, nr 7, artikkel-id 076004Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]
Measurements of the propagation frequency of magnetic islands in JET are compared with diamagnetic drift frequencies, in view of a possible diagnostic application to the determination of markers for the safety factor profile. Statistical analysis is performed for a database including many well-diagnosed plasma discharges. Propagation in the plasma frame, i.e. with subtracted E x B Doppler shift, results to be in the ion diamagnetic drift direction, with values ranging from 0.8 (for islands at the q = 2 resonant surface) to 1.8 (for more internal islands) times the ion diamagnetic drift frequency. The diagnostic potential of the assumption of island propagation at exactly the ion diamagnetic frequency is scrutinised. Rational-q locations obtained on the basis of this assumption are compared with the ones measured by equilibrium reconstruction including motional Stark effect measurements as constraints. Systematic shifts and standard deviations are determined for islands with (poloidal, toroidal) periodicity indexes of (2, 1), (3, 2), (4, 3) and (5, 3) and possible diagnostic applications are indicated.
sted, utgiver, år, opplag, sider
IOP PUBLISHING LTD , 2016. Vol. 56, nr 7, artikkel-id 076004
Emneord [en]
tearing mode, magnetic islands rotation, magnetic reconnection
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-272026DOI: 10.1088/0029-5515/56/7/076004ISI: 000378928600006Scopus ID: 2-s2.0-84978804547OAI: oai:DiVA.org:kth-272026DiVA, id: diva2:1424093
Merknad
QC 20200416
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