On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade

The access to fast measurements, i.e. Δt ≈ 100 µs, of the ions and the electrons during an entire edge localized cycle (ELM) reveals asymmetries in the recovery of the maximum edge gradients. Different magnetic fluctuations are found to correlate with the saturation of the edge ion temperature (Ti),...

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Autores: Cavedon, M., Dux, R., Putterich, T., Viezzer, Eleonora, Wolfrum, E., Dunne, M. G., Willensdorfer, M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/131720
Acceso en línea:https://hdl.handle.net/11441/131720
https://doi.org/10.1016/j.nme.2018.12.034
Access Level:acceso abierto
Palabra clave:ELM
Ion temperature
ETG
Neutral ionization
Fast Charge Exchange
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spelling On the ion and electron temperature recovery after the ELM-crash at ASDEX upgradeCavedon, M.Dux, R.Putterich, T.Viezzer, EleonoraWolfrum, E.Dunne, M. G.Willensdorfer, M.ELMIon temperatureETGNeutral ionizationFast Charge ExchangeThe access to fast measurements, i.e. Δt ≈ 100 µs, of the ions and the electrons during an entire edge localized cycle (ELM) reveals asymmetries in the recovery of the maximum edge gradients. Different magnetic fluctuations are found to correlate with the saturation of the edge ion temperature (Ti), electrons temperature (Te) and density (ne) gradients. In particular, while ∇Ti and ∇ne clamp roughly 3.0 ms after the ELM-crash together with the onset of mid-frequency (f ≲ 50 kHz) magnetic fluctuations, ∇Te recovers to the pre-ELM conditions only after 7.0 ms and saturates with the appearance of high frequency fluctuations (f ≈ 200 kHz). The effect of electron temperature gradient modes (ETGs) and of energy losses induced by ionization of neutrals are discussed as possible reasons for the delayed recovery of ∇Te. The onset and the suppression of ETGs qualitatively follow the requirements of an increased electron heat transport. However, gyro-kinetic simulations are necessary to quantify the impact of ETGs. On the other hand, the impact of the neutral ionization during the density build-up as an electron energy loss channel is measured to be small compared to the total electron energy. The dominant terms in the electron energy balance are instead the radiative power and the ion-electron heat exchange.ElsevierFísica Atómica, Molecular y Nuclear2019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/131720https://doi.org/10.1016/j.nme.2018.12.034reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésNuclear Materials and Energy, 18, 275-280.https://dx.doi.org/10.1016/j.nme.2018.12.034info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1317202026-06-17T12:51:07Z
dc.title.none.fl_str_mv On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
title On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
spellingShingle On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
Cavedon, M.
ELM
Ion temperature
ETG
Neutral ionization
Fast Charge Exchange
title_short On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
title_full On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
title_fullStr On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
title_full_unstemmed On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
title_sort On the ion and electron temperature recovery after the ELM-crash at ASDEX upgrade
dc.creator.none.fl_str_mv Cavedon, M.
Dux, R.
Putterich, T.
Viezzer, Eleonora
Wolfrum, E.
Dunne, M. G.
Willensdorfer, M.
author Cavedon, M.
author_facet Cavedon, M.
Dux, R.
Putterich, T.
Viezzer, Eleonora
Wolfrum, E.
Dunne, M. G.
Willensdorfer, M.
author_role author
author2 Dux, R.
Putterich, T.
Viezzer, Eleonora
Wolfrum, E.
Dunne, M. G.
Willensdorfer, M.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Física Atómica, Molecular y Nuclear
dc.subject.none.fl_str_mv ELM
Ion temperature
ETG
Neutral ionization
Fast Charge Exchange
topic ELM
Ion temperature
ETG
Neutral ionization
Fast Charge Exchange
description The access to fast measurements, i.e. Δt ≈ 100 µs, of the ions and the electrons during an entire edge localized cycle (ELM) reveals asymmetries in the recovery of the maximum edge gradients. Different magnetic fluctuations are found to correlate with the saturation of the edge ion temperature (Ti), electrons temperature (Te) and density (ne) gradients. In particular, while ∇Ti and ∇ne clamp roughly 3.0 ms after the ELM-crash together with the onset of mid-frequency (f ≲ 50 kHz) magnetic fluctuations, ∇Te recovers to the pre-ELM conditions only after 7.0 ms and saturates with the appearance of high frequency fluctuations (f ≈ 200 kHz). The effect of electron temperature gradient modes (ETGs) and of energy losses induced by ionization of neutrals are discussed as possible reasons for the delayed recovery of ∇Te. The onset and the suppression of ETGs qualitatively follow the requirements of an increased electron heat transport. However, gyro-kinetic simulations are necessary to quantify the impact of ETGs. On the other hand, the impact of the neutral ionization during the density build-up as an electron energy loss channel is measured to be small compared to the total electron energy. The dominant terms in the electron energy balance are instead the radiative power and the ion-electron heat exchange.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/131720
https://doi.org/10.1016/j.nme.2018.12.034
url https://hdl.handle.net/11441/131720
https://doi.org/10.1016/j.nme.2018.12.034
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Nuclear Materials and Energy, 18, 275-280.
https://dx.doi.org/10.1016/j.nme.2018.12.034
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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