Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions

Detalhes bibliográficos
Autor(a) principal: F. Salzedas
Data de Publicação: 2015
Outros Autores: G. Ronchi, J. H. F. Severo, R. M. O. Galvão, E. K. Sanada
Tipo de documento: Livro
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://hdl.handle.net/10216/79091
Resumo: Magnetic islands are known to degrade confinement of energy and particles in tokamak plasmas. They are also present in the precursor of density limit disruptions being observed until the onset of the energy quench of the disruption. The subject of the effect of plasma flow on tearing mode stability has been studied both theoretically [1] and experimentally [2]. However the experimental work has focused on plasmas with Neutral Beam Injection (NBI), which adds high momentum to both the plasma and the island, deviating them from their natural velocities. It is important to know the plasma/island rotation behavior without NBI, not just to know their natural values but because future large tokamaks, like ITER, are expected to have low plasma rotation due to both large plasma inertia and low applied torque. In this work we will show experimental values of the ion velocity and the magnetic island velocity measured in TCABR ohmic plasmas, without NBI, and during the precursor of a density limit disruption. In this way it was possible to compare the natural plasma velocity with the island velocity. The ion velocity was inferred from Doppler spectroscopy of the impurity lines of CVI. Details of this diagnostic system and an error analysis of the measured signal can be found in [3]. With the present set up, the toroidal velocity can be measured with time resolution equivalent to 600 Hz and precision somewhat better than 5 km/s.
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spelling Measurements of the natural plasma flow during the precursor of TCABR density limit disruptionsFísicaPhysical sciencesMagnetic islands are known to degrade confinement of energy and particles in tokamak plasmas. They are also present in the precursor of density limit disruptions being observed until the onset of the energy quench of the disruption. The subject of the effect of plasma flow on tearing mode stability has been studied both theoretically [1] and experimentally [2]. However the experimental work has focused on plasmas with Neutral Beam Injection (NBI), which adds high momentum to both the plasma and the island, deviating them from their natural velocities. It is important to know the plasma/island rotation behavior without NBI, not just to know their natural values but because future large tokamaks, like ITER, are expected to have low plasma rotation due to both large plasma inertia and low applied torque. In this work we will show experimental values of the ion velocity and the magnetic island velocity measured in TCABR ohmic plasmas, without NBI, and during the precursor of a density limit disruption. In this way it was possible to compare the natural plasma velocity with the island velocity. The ion velocity was inferred from Doppler spectroscopy of the impurity lines of CVI. Details of this diagnostic system and an error analysis of the measured signal can be found in [3]. With the present set up, the toroidal velocity can be measured with time resolution equivalent to 600 Hz and precision somewhat better than 5 km/s.20152015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/bookapplication/pdfhttps://hdl.handle.net/10216/79091engF. SalzedasG. RonchiJ. H. F. SeveroR. M. O. GalvãoE. K. Sanadainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-29T15:22:38Zoai:repositorio-aberto.up.pt:10216/79091Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:22:05.607680Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
title Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
spellingShingle Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
F. Salzedas
Física
Physical sciences
title_short Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
title_full Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
title_fullStr Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
title_full_unstemmed Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
title_sort Measurements of the natural plasma flow during the precursor of TCABR density limit disruptions
author F. Salzedas
author_facet F. Salzedas
G. Ronchi
J. H. F. Severo
R. M. O. Galvão
E. K. Sanada
author_role author
author2 G. Ronchi
J. H. F. Severo
R. M. O. Galvão
E. K. Sanada
author2_role author
author
author
author
dc.contributor.author.fl_str_mv F. Salzedas
G. Ronchi
J. H. F. Severo
R. M. O. Galvão
E. K. Sanada
dc.subject.por.fl_str_mv Física
Physical sciences
topic Física
Physical sciences
description Magnetic islands are known to degrade confinement of energy and particles in tokamak plasmas. They are also present in the precursor of density limit disruptions being observed until the onset of the energy quench of the disruption. The subject of the effect of plasma flow on tearing mode stability has been studied both theoretically [1] and experimentally [2]. However the experimental work has focused on plasmas with Neutral Beam Injection (NBI), which adds high momentum to both the plasma and the island, deviating them from their natural velocities. It is important to know the plasma/island rotation behavior without NBI, not just to know their natural values but because future large tokamaks, like ITER, are expected to have low plasma rotation due to both large plasma inertia and low applied torque. In this work we will show experimental values of the ion velocity and the magnetic island velocity measured in TCABR ohmic plasmas, without NBI, and during the precursor of a density limit disruption. In this way it was possible to compare the natural plasma velocity with the island velocity. The ion velocity was inferred from Doppler spectroscopy of the impurity lines of CVI. Details of this diagnostic system and an error analysis of the measured signal can be found in [3]. With the present set up, the toroidal velocity can be measured with time resolution equivalent to 600 Hz and precision somewhat better than 5 km/s.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-01-01T00:00:00Z
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status_str publishedVersion
dc.identifier.uri.fl_str_mv https://hdl.handle.net/10216/79091
url https://hdl.handle.net/10216/79091
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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