Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator

In this work, we study spontaneous electron to ion root transitions in TJ-II using Langmuir probes. By scanning the probe position on a shot to shot basis, we reconstruct a spatiotemporal map of the evolution of important turbulent quantities in the plasma edge region. We pay particular attention to...

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Detalles Bibliográficos
Autores: van Milligen, Boudewijn, Carreras, Benjamin, Voldiner, Igor, Losada, Ulises, Hidalgo, Carlos
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
Repositorio:Docu-menta. Repositorio Institucional del CIEMAT
Idioma:inglés
OAI Identifier:oai:dnet:documenta___::e457a2074a48a6b6a3b829dac49c16d3
Acceso en línea:https://hdl.handle.net/20.500.14855/2289
Access Level:acceso abierto
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spelling Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellaratorvan Milligen, BoudewijnCarreras, BenjaminVoldiner, IgorLosada, UlisesHidalgo, CarlosIn this work, we study spontaneous electron to ion root transitions in TJ-II using Langmuir probes. By scanning the probe position on a shot to shot basis, we reconstruct a spatiotemporal map of the evolution of important turbulent quantities in the plasma edge region. We pay particular attention to the evolution of the cross phase between transport-relevant variables, showing the spatiotemporal evolution of this quantity for the first time, revealing the outward propagation of the changes associated with the transition. We also compute the intermittence parameter, which allows us to conclude that the turbulence, although its amplitude increases, condenses in a reduced number of dominant modes and becomes less bursty. The causal relationship between variables is studied using the transfer entropy, clarifying the interactions between the main variables and offering a rather complete picture of the complex evolution of the plasma across the confinement transition.20242024-02-0120242024-02-0120242024-02-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14855/2289reponame:Docu-menta. Repositorio Institucional del CIEMATinstname:Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:dnet:documenta___::e457a2074a48a6b6a3b829dac49c16d32026-06-18T12:40:47Z
dc.title.none.fl_str_mv Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
title Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
spellingShingle Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
van Milligen, Boudewijn
title_short Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
title_full Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
title_fullStr Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
title_full_unstemmed Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
title_sort Causality, intermittence, and crossphase evolution during confinement transitions in the TJ-II stellarator
dc.creator.none.fl_str_mv van Milligen, Boudewijn
Carreras, Benjamin
Voldiner, Igor
Losada, Ulises
Hidalgo, Carlos
author van Milligen, Boudewijn
author_facet van Milligen, Boudewijn
Carreras, Benjamin
Voldiner, Igor
Losada, Ulises
Hidalgo, Carlos
author_role author
author2 Carreras, Benjamin
Voldiner, Igor
Losada, Ulises
Hidalgo, Carlos
author2_role author
author
author
author
dc.contributor.none.fl_str_mv
description In this work, we study spontaneous electron to ion root transitions in TJ-II using Langmuir probes. By scanning the probe position on a shot to shot basis, we reconstruct a spatiotemporal map of the evolution of important turbulent quantities in the plasma edge region. We pay particular attention to the evolution of the cross phase between transport-relevant variables, showing the spatiotemporal evolution of this quantity for the first time, revealing the outward propagation of the changes associated with the transition. We also compute the intermittence parameter, which allows us to conclude that the turbulence, although its amplitude increases, condenses in a reduced number of dominant modes and becomes less bursty. The causal relationship between variables is studied using the transfer entropy, clarifying the interactions between the main variables and offering a rather complete picture of the complex evolution of the plasma across the confinement transition.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024-02-01
2024
2024-02-01
2024
2024-02-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14855/2289
url https://hdl.handle.net/20.500.14855/2289
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Docu-menta. Repositorio Institucional del CIEMAT
instname:Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
instname_str Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
reponame_str Docu-menta. Repositorio Institucional del CIEMAT
collection Docu-menta. Repositorio Institucional del CIEMAT
repository.name.fl_str_mv
repository.mail.fl_str_mv
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