Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET

Use of new 3-strap ICRF antennas with all-tungsten (W) limiters in ASDEX Upgrade results in a reduction of the W sources at the antenna limiters and of the W content in the confined plasma by at least a factor of 2 compared to the W-limiter 2-strap antennas used in the past. The reduction is observe...

Descripción completa

Detalles Bibliográficos
Autores: Bobkov, V., Aguiam, D., Baruzzo, M., Borodin, D., Borodkina, I., Jet Contributors, García Muñoz, Manuel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/100413
Acceso en línea:https://hdl.handle.net/11441/100413
https://doi.org/10.1016/j.nme.2016.10.026
Access Level:acceso abierto
Palabra clave:ICRF
RF sheath
Three-strap
3-strap
ASDEX Upgrade
JET
ILW
A2 antenna
ILA
Sputtering
id ES_4e3ad848bf7b36cbfc6de8af8a85361d
oai_identifier_str oai:idus.us.es:11441/100413
network_acronym_str ES
network_name_str España
repository_id_str
spelling Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JETBobkov, V.Aguiam, D.Baruzzo, M.Borodin, D.Borodkina, I.Jet ContributorsGarcía Muñoz, ManuelICRFRF sheathThree-strap3-strapASDEX UpgradeJETILWA2 antennaILASputteringUse of new 3-strap ICRF antennas with all-tungsten (W) limiters in ASDEX Upgrade results in a reduction of the W sources at the antenna limiters and of the W content in the confined plasma by at least a factor of 2 compared to the W-limiter 2-strap antennas used in the past. The reduction is observed with a broad range of plasma shapes. In multiple locations of antenna frame, the limiter W source has a minimum when RF image currents are decreased by cancellation of the RF current contributions of the central and the outer straps. In JET with ITER-like wall, ITER-like antenna produces about 20% less of main chamber radiation and of W content compared to the old A2 antennas. However the effect of the A2 antennas on W content is scattered depending on which antennas are powered. Experiments in JET with trace nitrogen (N 2 ) injection show that a presence of active ICRF antenna close to the midplane injection valve has little effect on the core N content, both in dipole and in -90 °phasing. This indicates that the effect of ICRF on impurity transport across the scape-off-layer is small in JET compared to the dominant effect on impurity sources leading to increased impurity levels during ICRF operation.EURATOM 633053US Department of Energy DE-AC05-00OR22725ElsevierFísica Atómica, Molecular y NuclearRNM138: Física Nuclear Aplicada2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/100413https://doi.org/10.1016/j.nme.2016.10.026reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésNuclear Materials and Energy, 12, 1194-1198.633053DE-AC05-00OR22725http://dx.doi.org/10.1016/j.nme.2016.10.026info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1004132026-06-17T12:51:07Z
dc.title.none.fl_str_mv Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
title Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
spellingShingle Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
Bobkov, V.
ICRF
RF sheath
Three-strap
3-strap
ASDEX Upgrade
JET
ILW
A2 antenna
ILA
Sputtering
title_short Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
title_full Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
title_fullStr Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
title_full_unstemmed Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
title_sort Progress in reducing ICRF-specific impurity release in ASDEX upgrade and JET
dc.creator.none.fl_str_mv Bobkov, V.
Aguiam, D.
Baruzzo, M.
Borodin, D.
Borodkina, I.
Jet Contributors
García Muñoz, Manuel
author Bobkov, V.
author_facet Bobkov, V.
Aguiam, D.
Baruzzo, M.
Borodin, D.
Borodkina, I.
Jet Contributors
García Muñoz, Manuel
author_role author
author2 Aguiam, D.
Baruzzo, M.
Borodin, D.
Borodkina, I.
Jet Contributors
García Muñoz, Manuel
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Física Atómica, Molecular y Nuclear
RNM138: Física Nuclear Aplicada
dc.subject.none.fl_str_mv ICRF
RF sheath
Three-strap
3-strap
ASDEX Upgrade
JET
ILW
A2 antenna
ILA
Sputtering
topic ICRF
RF sheath
Three-strap
3-strap
ASDEX Upgrade
JET
ILW
A2 antenna
ILA
Sputtering
description Use of new 3-strap ICRF antennas with all-tungsten (W) limiters in ASDEX Upgrade results in a reduction of the W sources at the antenna limiters and of the W content in the confined plasma by at least a factor of 2 compared to the W-limiter 2-strap antennas used in the past. The reduction is observed with a broad range of plasma shapes. In multiple locations of antenna frame, the limiter W source has a minimum when RF image currents are decreased by cancellation of the RF current contributions of the central and the outer straps. In JET with ITER-like wall, ITER-like antenna produces about 20% less of main chamber radiation and of W content compared to the old A2 antennas. However the effect of the A2 antennas on W content is scattered depending on which antennas are powered. Experiments in JET with trace nitrogen (N 2 ) injection show that a presence of active ICRF antenna close to the midplane injection valve has little effect on the core N content, both in dipole and in -90 °phasing. This indicates that the effect of ICRF on impurity transport across the scape-off-layer is small in JET compared to the dominant effect on impurity sources leading to increased impurity levels during ICRF operation.
publishDate 2017
dc.date.none.fl_str_mv 2017
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/11441/100413
https://doi.org/10.1016/j.nme.2016.10.026
url https://hdl.handle.net/11441/100413
https://doi.org/10.1016/j.nme.2016.10.026
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Nuclear Materials and Energy, 12, 1194-1198.
633053
DE-AC05-00OR22725
http://dx.doi.org/10.1016/j.nme.2016.10.026
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
_version_ 1869407742533304320
score 15,300724

Similares en LA Referencia