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Global two-fluid simulations of geodesic acoustic modes in strongly shaped tight aspect ratio tokamak plasmas
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MAST team (Including: Robinson, J. R., Hnat, B., Thyagaraja, A., McClements, K. G., Knight, P. J. and Kirk, A.). (2013) Global two-fluid simulations of geodesic acoustic modes in strongly shaped tight aspect ratio tokamak plasmas. Physics of Plasmas, Volume 20 (Number 5). Article number 052302. doi:10.1063/1.4804271 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.4804271
Abstract
Following recent observations suggesting the presence of the geodesic acoustic mode (GAM) in ohmically heated discharges in the Mega Amp Spherical Tokamak (MAST) [J. R. Robinson et al., Plasma Phys. Controlled Fusion 54, 105007 (2012)], the behaviour of the GAM is studied numerically using the two fluid, global code CENTORI [P. J. Knight et al. Comput. Phys. Commun. 183, 2346 (2012)]. We examine mode localisation and effects of magnetic geometry, given by aspect ratio, elongation, and safety factor, on the observed frequency of the mode. An excellent agreement between simulations and experimental data is found for simulation plasma parameters matched to those of MAST. Increasing aspect ratio yields good agreement between the GAM frequency found in the simulations and an analytical result obtained for elongated large aspect ratio plasmas.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physics of Plasmas | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 1070-664X | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 20 | ||||
Number: | Number 5 | ||||
Page Range: | Article number 052302 | ||||
DOI: | 10.1063/1.4804271 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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