dc.creator | McClements, K. G. | es |
dc.creator | Brisset, A. | es |
dc.creator | Chapman, B. | es |
dc.creator | Chapman, S. C. | es |
dc.creator | Dendy, R. O. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-07-15T13:50:00Z | |
dc.date.available | 2020-07-15T13:50:00Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | McClements, K.G., Brisset, A., Chapman, B., Chapman, S.C., Dendy, R.O., Jet Contributors, y García Muñoz, M. (2018). Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating. Nuclear Fusion, 58 (9), 1-16. https://doi.org/10.1088/1741-4326/aace03. | |
dc.identifier.issn | 1741-4326 | es |
dc.identifier.uri | https://hdl.handle.net/11441/99493 | |
dc.description.abstract | 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. | es |
dc.description.sponsorship | EURATOM 633053 | es |
dc.description.sponsorship | RCUK Energy Programme P012450/1 | es |
dc.format | application/pdf | es |
dc.format.extent | 17 p. | es |
dc.language.iso | eng | es |
dc.publisher | IOP Publishing | es |
dc.relation.ispartof | Nuclear Fusion, 58 (9), 1-16. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Energetic particles | es |
dc.subject | Ion cyclotron resonance heating | es |
dc.subject | Ion cyclotron emission | es |
dc.subject | Particle-in-cell simulations | es |
dc.title | Observations and modelling of ion cyclotron emission observed in JET plasmas using a sub-harmonic arc detection system during ion cyclotron resonance heating | es |
dc.type | info:eu-repo/semantics/article | es |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear | es |
dc.relation.projectID | 633053 | es |
dc.relation.projectID | P012450/1 | es |
dc.relation.publisherversion | https://doi.org/10.1088/1741-4326/aace03 | es |
dc.identifier.doi | 10.1088/1741-4326/aace03 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Fusion | es |
dc.publication.volumen | 58 | es |
dc.publication.issue | 9 | es |
dc.publication.initialPage | 1 | es |
dc.publication.endPage | 16 | es |