<div class="csl-bib-body">
<div class="csl-entry">David, P., Bernert, M., Cavedon, M., Harrer, G., & Eich, T. (2022). Influence of pedestal radiation on the H–L transition using krypton seeded discharges at ASDEX Upgrade. <i>Nuclear Fusion</i>, <i>62</i>(10), 106012-1-106012–106018. https://doi.org/10.1088/1741-4326/ac8942</div>
</div>
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dc.identifier.issn
0029-5515
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/80432
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dc.description.abstract
Krypton can be a tool to re!ne and analyse the H–L power threshold in detail, as a proxy for
L–H threshold, taking into account radiative losses in the region where the H–L transition
takes place and, thus, decouple the power flux over the pedestal top to the one over the
separatrix. The commonly used ITPA 2008 L–H threshold scaling does not account for
radiation but it is often assumed that it should be compared to the net power crossing the
separatrix. Yet, dedicated analyses are still lacking. At ASDEX Upgrade, krypton radiates
dominantly at the very edge of the con!ned plasma (!pol between 0.97 and 1.01). Recent
results show that L–H and H–L transitions are initiated close to !pol = 0.98. As such, the bulk
of krypton radiation is between the separatrix and a potential source location for the transition.
Scans in krypton seeding level and heating power have been performed to study and compare
the in"uence of the powers radiated from inside the separatrix and the pedestal top on the
plasma con!nement state. The heating power is compared to the usual L–H power scaling but
corrected by either of these two radiations for seeded H–L transitions. The power scaling is
shown to remain valid for higher input and radiated powers, up to 3–5 times the non-seeded
L–H power threshold of AUG, when the radiation inside the separatrix is subtracted from the
input power. Additionally, kinetic and radiation pro!les are used to run TRANSP analyses to
compare the edge ion heat to past studies from unseeded discharges. Using this physical
parameter gives a reference point from a very different parameter range of input and radiated
powers, densities and back, instead of forward, transition.
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
L–H transition, radiation, impurities, power scaling
en
dc.title
Influence of pedestal radiation on the H–L transition using krypton seeded discharges at ASDEX Upgrade
en
dc.type
Article
en
dc.type
Artikel
de
dc.description.startpage
106012-1
-
dc.description.endpage
106012-8
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dc.type.category
Original Research Article
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tuw.container.volume
62
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tuw.container.issue
10
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tuw.journal.peerreviewed
true
-
tuw.peerreviewed
true
-
tuw.researchTopic.id
M2
-
tuw.researchTopic.name
Materials Characterization
-
tuw.researchTopic.value
100
-
tuw.linking
https://doi.org/10.1088/1741-4326/ac8942
-
dcterms.isPartOf.title
Nuclear Fusion
-
tuw.publication.orgunit
E134-03 - Forschungsbereich Atomic and Plasma Physics
-
tuw.publisher.doi
10.1088/1741-4326/ac8942
-
dc.identifier.eissn
1741-4326
-
dc.description.numberOfPages
8
-
tuw.author.orcid
0000-0003-4837-8507
-
tuw.author.orcid
0000-0003-1131-0867
-
tuw.author.orcid
0000-0002-0013-9753
-
tuw.author.orcid
0000-0002-1150-3987
-
tuw.author.orcid
0000-0003-3065-8420
-
wb.sci
true
-
wb.sciencebranch
Physik, Astronomie
-
wb.sciencebranch.oefos
1030
-
wb.sciencebranch.value
100
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Article
-
item.openairetype
Artikel
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restricted
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Publications
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item.cerifentitytype
Publications
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item.languageiso639-1
en
-
item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.fulltext
no Fulltext
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crisitem.author.dept
E134-03 - Forschungsbereich Atomic and Plasma Physics