Bokshi, A., Dickinson, D. orcid.org/0000-0002-0868-211X, Roach, C. M. et al. (1 more author) (2016) The response of toroidal drift modes to profile evolution:A model for small-ELMs in tokamak plasmas? Plasma Physics and Controlled Fusion. 075011. pp. 1-13. ISSN 1361-6587
Abstract
We consider a time-dependent linear global electrostatic toroidal fluid ion-temperature gradient (ITG) model to study the evolution of toroidal drift modes in tokamak plasmas as the equilibrium flow-shear varies with time. While we consider the ITG mode as a specific example, the results are expected to be valid for most other toroidal microinstabilities. A key result is that when there is a position in the plasma with a maximum in the instability drive (e.g. ITG), there is a transient burst of stronger growth as the flow-shear evolves through a critical value. This transient burst is expected to drive a filamentary plasma eruption, reminiscent of small-ELMs. The amplitude of the dominant linear mode is initially peaked above or below the outboard midplane, and rotates through it poloidally as the flow-shear passes through the critical value. This theoretical prediction could provide an experimental test of whether this mechanism underlies some classes of small-ELMs.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 IOP Publishing Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details. Embargo period : 12 months |
Keywords: | ballooning formalism,Floquet modes,small ELMs,toroidal drift modes |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 19 Jul 2016 09:42 |
Last Modified: | 25 Dec 2024 00:14 |
Published Version: | https://doi.org/10.1088/0741-3335/58/7/075011 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/0741-3335/58/7/075011 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:102607 |