Electron-cyclotron wave propagation, absorption and current drive in the presence of neoclassical tearing modes

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dc.contributor.author Isliker, H en
dc.contributor.author Chatziantonaki, I en
dc.contributor.author Tsironis, C en
dc.contributor.author Vlahos, L en
dc.date.accessioned 2014-03-01T02:08:51Z
dc.date.available 2014-03-01T02:08:51Z
dc.date.issued 2012 en
dc.identifier.issn 07413335 en
dc.identifier.uri http://hdl.handle.net/123456789/29731
dc.subject.other Axisymmetric en
dc.subject.other Current drives en
dc.subject.other Electron cyclotrons en
dc.subject.other Flux surfaces en
dc.subject.other Magnetic equilibrium en
dc.subject.other Magnetic island en
dc.subject.other Neoclassical tearing modes en
dc.subject.other Power deposition en
dc.subject.other Ray-tracing codes en
dc.subject.other Resonant particles en
dc.subject.other Tokamak plasmas en
dc.subject.other Toroidal geometry en
dc.subject.other Wave evolution en
dc.subject.other Computational geometry en
dc.subject.other Cyclotron radiation en
dc.subject.other Magnetoplasma en
dc.subject.other Plasma waves en
dc.subject.other Topology en
dc.subject.other Electron beams en
dc.title Electron-cyclotron wave propagation, absorption and current drive in the presence of neoclassical tearing modes en
heal.type journalArticle en
heal.identifier.primary 10.1088/0741-3335/54/9/095005 en
heal.identifier.secondary http://dx.doi.org/10.1088/0741-3335/54/9/095005 en
heal.identifier.secondary 095005 en
heal.publicationDate 2012 en
heal.abstract We analyze the propagation of electron-cyclotron waves, their absorption and current drive when neoclassical tearing modes (NTMs), in the form of magnetic islands, are present in a tokamak plasma. So far, the analysis of the wave propagation and power deposition in the presence of NTMs has been performed mainly in the frame of an axisymmetric magnetic field, ignoring any effects from the island topology. Our analysis starts from an axisymmetric magnetic equilibrium, which is perturbed such as to exhibit magnetic islands. In this geometry, we compute the wave evolution with a ray-tracing code, focusing on the effect of the island topology on the efficiency of the absorption and current drive. To increase the precision in the calculation of the power deposition, the standard analytical flux-surface labeling for the island region has been adjusted from the usual cylindrical to toroidal geometry. The propagation up to the O-point is found to be little affected by the island topology, whereas the power absorbed and the driven current are significantly enhanced, because the resonant particles are bound to the small volumes in between the flux surfaces of the island. The consequences of these effects on the NTM evolution are investigated in terms of the modified Rutherford equation. © 2012 IOP Publishing Ltd. en
heal.journalName Plasma Physics and Controlled Fusion en
dc.identifier.doi 10.1088/0741-3335/54/9/095005 en
dc.identifier.volume 54 en
dc.identifier.issue 9 en

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