dc.creator | Chapman, S. C. | es |
dc.creator | Dendy, R. O. | es |
dc.creator | Lang, P. T. | es |
dc.creator | Watkins, N. W. | es |
dc.creator | Calderon, F. A. | es |
dc.creator | Jet Contributors | es |
dc.creator | García Muñoz, Manuel | es |
dc.date.accessioned | 2020-08-26T14:18:38Z | |
dc.date.available | 2020-08-26T14:18:38Z | |
dc.date.issued | 2017-02 | |
dc.identifier.citation | Chapman, S.C., Dendy, R.O., Lang, P.T., Watkins, N.W., Calderon, F.A., Jet Contributors, y García Muñoz, M. (2017). The global build-up to intrinsic ELM bursts and comparison with pellet triggered ELMs seen in JET. Nuclear Fusion, 57 (2), 022017. https://doi.org/10.1088/0029-5515/57/2/022017. | |
dc.identifier.issn | 0029-5515 | es |
dc.identifier.uri | https://hdl.handle.net/11441/100454 | |
dc.description.abstract | We focus on JET plasmas in which ELMs are triggered by pellets in the presence of ELMs
which occur naturally. We perform direct time domain analysis of signals from fast radial
field coils and toroidal full flux azimuthal loops. These toroidally integrating signals provide
simultaneous high time resolution measurements of global plasma dynamics and its coupling
to the control system. We examine the time dynamics of these signals in plasmas where pellet
injection is used to trigger ELMs in the presence of naturally occurring ELMs. Pellets whose
size and speed are intended to provide maximum local perturbation for ELM triggering are
launched at pre-programmed times, without correlation to the occurrence times of intrinsic
ELMs. Pellet rates were sufficiently low to prevent sustained changes of the underlying
plasma conditions and natural ELM behaviour. We find a global signature of the build-up to
natural ELMs in the temporal analytic phase of both the full flux loops and fast radial field
coil signals. Before a natural ELM, the signal phases align to the same value on a ∼2–5ms
timescale. This global build up to a natural ELM occurs whilst the amplitude of the full flux
loop and fast radial field coil signals are at their background value: it precedes the response
seen in these signals to the onset of ELMing. In contrast these signals do not clearly phase
align before the ELM for ELMs which are the first to occur following pellet injection. This
provides a direct test that can distinguish when an ELM is triggered by a pellet as opposed to
occurring naturally. It further supports the idea [1–4] of a global build up phase that precedes
natural ELMs; pellets can trigger ELMs even when the signal phase is at a value when a
natural ELM is unlikely to occur | es |
dc.description.sponsorship | EURATOM 633053 | es |
dc.description.sponsorship | ONR NICOP N62909-15-1-N143 | es |
dc.format | application/pdf | es |
dc.format.extent | 10 p. | es |
dc.language.iso | eng | es |
dc.publisher | IOP Publishing | es |
dc.relation.ispartof | Nuclear Fusion, 57 (2), 022017. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Edge localised modes | es |
dc.subject | Control system | es |
dc.subject | Phase synchronization | es |
dc.subject | Pellets | es |
dc.title | The global build-up to intrinsic ELM bursts and comparison with pellet triggered ELMs seen in JET | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
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 | N62909-15-1-N143 | es |
dc.relation.publisherversion | http://dx.doi.org/10.1088/0029-5515/57/2/022017 | es |
dc.identifier.doi | 10.1088/0029-5515/57/2/022017 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Nuclear Fusion | es |
dc.publication.volumen | 57 | es |
dc.publication.issue | 2 | es |
dc.publication.initialPage | 022017 | es |