<div class="csl-bib-body">
<div class="csl-entry">Willensdorfer, M., Denk, S. S., Strumberger, E., Suttrop, W., Vanovac, B., Brida, D., Cavedon, M., Classen, I. G. J., Dunne, M., Fietz, S., Fischer, R., Kirk, A., Laggner, F., Liu, Y., Odstrčil, T., Ryan, D. A., Viezzer, E., Zohm, H., & Luhmann, I. C. (2016). Plasma response measurements of external magnetic perturbations using electron cyclotron emission and comparisons to 3D ideal MHD equilibrium. <i>Plasma Physics and Controlled Fusion</i>, <i>58</i>(11), Article 114004. https://doi.org/10.1088/0741-3335/58/11/114004</div>
</div>
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dc.identifier.issn
0741-3335
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/148918
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dc.description.abstract
The plasma response from an external n = 2 magnetic perturbation field in ASDEX Upgrade
has been measured using mainly electron cyclotron emission (ECE) diagnostics and a rigid
rotating field. To interpret ECE and ECE-imaging (ECE-I) measurements accurately, forward
modeling of the radiation transport has been combined with ray tracing. The measured data is
compared to synthetic ECE data generated from a 3D ideal magnetohydrodynamics (MHD)
equilibrium calculated by VMEC.
The measured amplitudes of the helical displacement around the outboard midplane are
in reasonable agreement with the one from the synthetic VMEC diagnostics. Both exceed the
predictions from the vacuum field calculations and indicate the presence of a kink response at
the edge, which amplifies the perturbation. VMEC and MARS-F have been used to calculate
the properties of this kink mode. The poloidal mode structure of the magnetic perturbation
of this kink mode at the edge peaks at poloidal mode numbers larger than the resonant
components |m|>|nq|, whereas the poloidal mode structure of its displacement is almost
resonant |m| |nq|. This is expected from ideal MHD in the proximity of rational surfaces.
The displacement measured by ECE-I confirms this resonant response.
en
dc.language.iso
en
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dc.publisher
IOP PUBLISHING LTD
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dc.relation.ispartof
Plasma Physics and Controlled Fusion
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dc.subject
Condensed Matter Physics
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dc.subject
Nuclear Energy and Engineering
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dc.subject
ideal MHD
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dc.subject
magnetic perturbations
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dc.subject
plasma response
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dc.subject
ECE
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dc.subject
ECE imaging
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dc.title
Plasma response measurements of external magnetic perturbations using electron cyclotron emission and comparisons to 3D ideal MHD equilibrium
en
dc.type
Artikel
de
dc.type
Article
en
dc.type.category
Original Research Article
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tuw.container.volume
58
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tuw.container.issue
11
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
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wb.publication.intCoWork
International Co-publication
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tuw.researchTopic.id
M2
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.value
100
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dcterms.isPartOf.title
Plasma Physics and Controlled Fusion
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tuw.publication.orgunit
E134-03 - Forschungsbereich Atomic and Plasma Physics