Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating

Measurements are reported of electromagnetic emission close to the cyclotron frequency of energetic ions in JET plasmas heated by waves in the ion cylotron range of frequencies (ICRF). Hydrogen was the majority ion species in all of these plasmas. The measurements were obtained using a sub-harmonic...

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Autores: McClements, K. G., Brisset, A., Chapman, B., Chapman, S. C., Dendy, R. O., Jet Contributors, García Muñoz, Manuel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/99493
Acceso en línea:https://hdl.handle.net/11441/99493
https://doi.org/10.1088/1741-4326/aace03
Access Level:acceso abierto
Palabra clave:Energetic particles
Ion cyclotron resonance heating
Ion cyclotron emission
Particle-in-cell simulations
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spelling Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heatingMcClements, K. G.Brisset, A.Chapman, B.Chapman, S. C.Dendy, R. O.Jet ContributorsGarcía Muñoz, ManuelEnergetic particlesIon cyclotron resonance heatingIon cyclotron emissionParticle-in-cell simulationsMeasurements are reported of electromagnetic emission close to the cyclotron frequency of energetic ions in JET plasmas heated by waves in the ion cylotron range of frequencies (ICRF). Hydrogen was the majority ion species in all of these plasmas. The measurements were obtained using a sub-harmonic arc detection system in the transmission lines of one of the ICRF antennas. The measured ion cyclotron emission spectra were strongly filtered by the antenna system, and typically contained sub-structure, consisting of sets of peaks with a separation of a few kHz, suggesting the excitation of compressional Alfvén eigenmodes closely spaced in frequency. In most cases the energetic ions can be clearly identified as ICRF wave-accelerated 3 He minority ions, although in two pulses the emission may have been produced by energetic 4 He ions, originating from third harmonic ICRF wave acceleration. It is proposed that the emission close to the 3 He cyclotron frequency was produced by energetic ions of this species undergoing drift orbit excursions to the outer midplane plasma edge. Particle-in-cell and hybrid (kinetic ion, fluid electron) simulations using plasma parameters corresponding to edge plasma conditions in these JET pulses, and energetic particle parameters inferred from the cyclotron resonance location, indicate strong excitation of waves at multiple. He cyclotron harmonics, including the fundamental, which is identified with the observed emission. These results underline the potential importance of ICE measurements as a method of studying confined fast particles that are strongly suprathermal but have insufficient energies or are not present in sufficient numbers to excite detectable levels of γ-ray emission or other collective instabilities.EURATOM 633053RCUK Energy Programme P012450/1IOP PublishingFísica Atómica, Molecular y NuclearRNM138: Física Nuclear Aplicada2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/99493https://doi.org/10.1088/1741-4326/aace03reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésNuclear Fusion, 58 (9), 1-16.633053P012450/1https://doi.org/10.1088/1741-4326/aace03info:eu-repo/semantics/openAccessoai:idus.us.es:11441/994932026-06-17T12:51:07Z
dc.title.none.fl_str_mv Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
title Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
spellingShingle Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
McClements, K. G.
Energetic particles
Ion cyclotron resonance heating
Ion cyclotron emission
Particle-in-cell simulations
title_short Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
title_full Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
title_fullStr Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
title_full_unstemmed Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
title_sort Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating
dc.creator.none.fl_str_mv McClements, K. G.
Brisset, A.
Chapman, B.
Chapman, S. C.
Dendy, R. O.
Jet Contributors
García Muñoz, Manuel
author McClements, K. G.
author_facet McClements, K. G.
Brisset, A.
Chapman, B.
Chapman, S. C.
Dendy, R. O.
Jet Contributors
García Muñoz, Manuel
author_role author
author2 Brisset, A.
Chapman, B.
Chapman, S. C.
Dendy, R. O.
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 Energetic particles
Ion cyclotron resonance heating
Ion cyclotron emission
Particle-in-cell simulations
topic Energetic particles
Ion cyclotron resonance heating
Ion cyclotron emission
Particle-in-cell simulations
description Measurements are reported of electromagnetic emission close to the cyclotron frequency of energetic ions in JET plasmas heated by waves in the ion cylotron range of frequencies (ICRF). Hydrogen was the majority ion species in all of these plasmas. The measurements were obtained using a sub-harmonic arc detection system in the transmission lines of one of the ICRF antennas. The measured ion cyclotron emission spectra were strongly filtered by the antenna system, and typically contained sub-structure, consisting of sets of peaks with a separation of a few kHz, suggesting the excitation of compressional Alfvén eigenmodes closely spaced in frequency. In most cases the energetic ions can be clearly identified as ICRF wave-accelerated 3 He minority ions, although in two pulses the emission may have been produced by energetic 4 He ions, originating from third harmonic ICRF wave acceleration. It is proposed that the emission close to the 3 He cyclotron frequency was produced by energetic ions of this species undergoing drift orbit excursions to the outer midplane plasma edge. Particle-in-cell and hybrid (kinetic ion, fluid electron) simulations using plasma parameters corresponding to edge plasma conditions in these JET pulses, and energetic particle parameters inferred from the cyclotron resonance location, indicate strong excitation of waves at multiple. He cyclotron harmonics, including the fundamental, which is identified with the observed emission. These results underline the potential importance of ICE measurements as a method of studying confined fast particles that are strongly suprathermal but have insufficient energies or are not present in sufficient numbers to excite detectable levels of γ-ray emission or other collective instabilities.
publishDate 2018
dc.date.none.fl_str_mv 2018
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/11441/99493
https://doi.org/10.1088/1741-4326/aace03
url https://hdl.handle.net/11441/99493
https://doi.org/10.1088/1741-4326/aace03
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Nuclear Fusion, 58 (9), 1-16.
633053
P012450/1
https://doi.org/10.1088/1741-4326/aace03
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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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