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Microstability analysis of pellet fuelled discharges in MAST
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Garzotti, L., Figueiredo, J., Roach, C. M., Valovič, M., Dickinson, D., Naylor, G., Romanelli, M., Scannell, R. and Szepesi, G. (2014) Microstability analysis of pellet fuelled discharges in MAST. Plasma Physics and Controlled Fusion, Volume 56 (Number 3). Article number 035004. doi:10.1088/0741-3335/56/3/035004 ISSN 0741-3335.
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Official URL: http://dx.doi.org/10.1088/0741-3335/56/3/035004
Abstract
Reactor grade plasmas are likely to be fuelled by pellet injection. This technique transiently perturbs the profiles, driving the density profile hollow and flattening the edge temperature profile. After the pellet perturbation, the density and temperature profiles relax towards their quasi-steady-state shape. Microinstabilities influence plasma confinement and will play a role in determining the evolution of the profiles in pellet fuelled plasmas. In this paper we present the microstability analysis of pellet fuelled H-mode MAST plasmas. Taking advantage of the unique capabilities of the MAST Thomson scattering system and the possibility of synchronizing the eight lasers with the pellet injection, we were able to measure the evolution of the post-pellet electron density and temperature profiles with high temporal and spatial resolution. These profiles, together with ion temperature profiles measured using a charge exchange diagnostic, were used to produce equilibria suitable for microstability analysis of the equilibrium changes induced by pellet injection. This analysis, carried out using the local gyrokinetic code GS2, reveals that the microstability properties are extremely sensitive to the rapid and large transient excursions of the density and temperature profiles, which also change collisionality and βe significantly in the region most strongly affected by the pellet ablation.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||||||
Publisher: | Institute of Physics Publishing Ltd. | ||||||||
ISSN: | 0741-3335 | ||||||||
Official Date: | 5 February 2014 | ||||||||
Dates: |
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Volume: | Volume 56 | ||||||||
Number: | Number 3 | ||||||||
Article Number: | Article number 035004 | ||||||||
DOI: | 10.1088/0741-3335/56/3/035004 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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