<div class="csl-bib-body">
<div class="csl-entry">Laggner, F., Wolfrum, E., Cavedon, M., Dunne, M. G., Birkenmeier, G., Fischer, R., Willensdorfer, M., Aumayr, F., The EUROfusion MST1 Team, & The ASDEX Upgrade Team. (2018). Plasma shaping and its impact on the pedestal of ASDEX Upgrade: edge stability and inter-ELM dynamics at varied triangularity. <i>Nuclear Fusion</i>, <i>58</i>(4), 046008. https://doi.org/10.1088/1741-4326/aaaa43</div>
</div>
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dc.identifier.issn
0029-5515
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/144858
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dc.description.abstract
behaviour of edge localised modes (ELMs) and the pre-ELM pedestal stability for different
plasma shapes. Generally, at higher δ the pedestal top electron density (ne) is enhanced and
the ELM repetition frequency (fELM) is reduced. For all δ, the pedestal top ne is already fully
established to its pre-ELM value during the initial recovery phase of the ne pedestal, which
takes place immediately after the ELM crash. The lowering of the fELM with increasing δ is
related to longer pedestal recovery phases, especially the last pre-ELM phase with clamped
pedestal gradients (after the recovery phases of the ne and electron temperature (Te) pedestal)
is extended. In all investigated discharge intervals, the pre-ELM pedestal profiles are in
agreement with peeling-ballooning (PB) theory.
Over the investigated range of δ, two well-separated fELM bands are observed in several
discharge intervals. Their occurrence is linked to the inter-ELM pedestal stability. In both
kinds of ELM cycles the pedestal evolves similarly, however, the 'fast' ELM cycle occurs
before the global plasma stored energy (WMHD) increases, which then provides a stabilising
effect on the pedestal, extending the inter-ELM period in the case of the 'slow' ELM cycle. At
the end of a 'fast' ELM cycle the ne profile is radially shifted inwards relative to the ne profile
at the end of a 'slow' ELM cycle, leading to a reduced pressure gradient. The appearance of
two fELM bands suggests that the pedestal becomes more likely PB unstable in certain phases
of the inter-ELM evolution. Such a behaviour is possible because the evolution of the global
plasma is not rigidly coupled to the evolution of the pedestal structure on the timescales of an
ELM cycle.
en
dc.language.iso
en
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dc.publisher
IOP PUBLISHING LTD
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dc.relation.ispartof
Nuclear Fusion
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dc.subject
Condensed Matter Physics
en
dc.subject
Nuclear and High Energy Physics
en
dc.subject
H-mode
en
dc.subject
tokamak
en
dc.subject
edge localised modes
en
dc.subject
plasma shaping
en
dc.subject
ELM behaviour
en
dc.title
Plasma shaping and its impact on the pedestal of ASDEX Upgrade: edge stability and inter-ELM dynamics at varied triangularity
en
dc.type
Artikel
de
dc.type
Article
en
dc.description.startpage
046008
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dc.type.category
Original Research Article
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tuw.container.volume
58
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tuw.container.issue
4
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tuw.journal.peerreviewed
true
-
tuw.peerreviewed
true
-
wb.publication.intCoWork
International Co-publication
-
tuw.researchTopic.id
M2
-
tuw.researchTopic.name
Materials Characterization
-
tuw.researchTopic.value
100
-
dcterms.isPartOf.title
Nuclear Fusion
-
tuw.publication.orgunit
E134-03 - Forschungsbereich Atomic and Plasma Physics
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tuw.publisher.doi
10.1088/1741-4326/aaaa43
-
dc.identifier.eissn
1741-4326
-
dc.description.numberOfPages
13
-
tuw.author.orcid
0000-0003-1601-2973
-
wb.sci
true
-
wb.sciencebranch
Physik, Astronomie
-
wb.sciencebranch.oefos
1030
-
wb.facultyfocus
Physikalische Technologie
de
wb.facultyfocus
Physical Technology
en
wb.facultyfocus.faculty
E130
-
dc.contributor.authorgroup
The EUROfusion MST1 Team
-
dc.contributor.authorgroup
The ASDEX Upgrade Team
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item.fulltext
no Fulltext
-
item.openairecristype
http://purl.org/coar/resource_type/c_2df8fbb1
-
item.languageiso639-1
en
-
item.cerifentitytype
Publications
-
item.openairetype
research article
-
item.grantfulltext
none
-
crisitem.author.dept
E134 - Institut für Angewandte Physik
-
crisitem.author.dept
E134 - Institut für Angewandte Physik
-
crisitem.author.dept
E134 - Institut für Angewandte Physik
-
crisitem.author.dept
E134-03 - Forschungsbereich Atomic and Plasma Physics