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dc.creatorHeidbrink, W. W.es
dc.creatorAustin, M. E.es
dc.creatorFisher, R. K.es
dc.creatorGarcía Muñoz, Manueles
dc.creatorMatsunaga, G.es
dc.date.accessioned2020-08-31T13:59:02Z
dc.date.available2020-08-31T13:59:02Z
dc.date.issued2011-08
dc.identifier.citationHeidbrink, W.W., Austin, M.E., Fisher, R.K., García Muñoz, M. y Matsunaga, G. (2011). Characterization of off-axis fishbones. Plasma Physics and Controlled Fusion, 53 (8), 085028-.
dc.identifier.issn0741-3335es
dc.identifier.urihttps://hdl.handle.net/11441/100566
dc.description.abstractRepetitive bursting instabilities with strong frequency chirping occur in highbeta, beam-heated plasmas with safety factor q > 1 in the DIII-D tokamak. Although the mode structures differ, in many ways, the off-axis fishbones are similar to the q = 1 fishbones first observed on the Poloidal Divertor Experiment (PDX). The modes are driven by energetic trapped ions at the fastion precession frequency. During a burst, the frequency changes most rapidly as the mode reaches its maximum amplitude. Larger amplitude bursts have larger growth rates and frequency chirps. Unlike PDX fishbones, the decay phase is highly variable and is usually shorter than the growth phase. Also, the waveform is highly distorted by higher harmonics during the latter portion of a burst. The radial mode structure alters its shape during the burst. Like PDX fishbones, the modes expel trapped ions in a ‘beacon’ with a definite phase relationship relative to the mode. Seven types of loss detectors measure the beacon. The losses scale linearly with mode amplitude. The neutron rate changes most rapidly at maximum mode amplitude but, depending on the loss diagnostic, the losses often peak a few cycles later. The non-ambipolar fast-ion losses cause a sudden change in toroidal rotation frequency across the entire plasma. In addition to an overall drop, the neutron signal oscillates in response to the wave. Unlike the beacon of lost particles, which maintains a fixed phase relative to the mode, the phase of the neutron oscillations steadily increases throughout the burst, with the greatest phase slippage occurring in the highly nonlinear phase near maximum mode amplitudees
dc.description.sponsorshipUS Department of Energy SC-G903402, DE-FC02-04ER54698, DE-FG02-07ER54917es
dc.formatapplication/pdfes
dc.format.extent24 p.es
dc.language.isoenges
dc.publisherIOP Publishinges
dc.relation.ispartofPlasma Physics and Controlled Fusion, 53 (8), 085028-.
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleCharacterization of off-axis fishboneses
dc.typeinfo:eu-repo/semantics/articlees
dcterms.identifierhttps://ror.org/03yxnpp24
dc.type.versioninfo:eu-repo/semantics/publishedVersiones
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.contributor.affiliationUniversidad de Sevilla. Departamento de Física Atómica, Molecular y Nucleares
dc.relation.projectIDSC-G903402es
dc.relation.projectIDDE-FC02-04ER54698es
dc.relation.projectIDDE-FG02-07ER54917es
dc.relation.publisherversionhttp://dx.doi.org/10.1088/0741-3335/53/8/085028es
dc.identifier.doi10.1088/0741-3335/53/8/085028es
dc.contributor.groupUniversidad de Sevilla. RNM138: Física Nuclear Aplicadaes
dc.journaltitlePlasma Physics and Controlled Fusiones
dc.publication.volumen53es
dc.publication.issue8es
dc.publication.initialPage085028es

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