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Electron kinetics inferred from observations of microwave bursts during edge localized modes in the mega-amp spherical tokamak

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Freethy, S., McClements, K. G., Chapman, Sandra C., Dendy, R. O., Lai, W. N., Pamela, S. J. P., Shevchenko, V. F. (Vladimir F.) and Vann, R. G. L. (2015) Electron kinetics inferred from observations of microwave bursts during edge localized modes in the mega-amp spherical tokamak. Physical Review Letters, Volume 114 (Number 12). Article number 125004. doi:10.1103/PhysRevLett.114.125004

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.114.125004

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Abstract

Recent measurements of microwave and x-ray emission during edge localized mode (ELM) activity in tokamak plasmas provide a fresh perspective on ELM physics. It is evident that electron kinetics, which are not incorporated in standard (fluid) models for the instability that drives ELMs, play a key role in the new observations. These effects should be included in future models for ELMs and the ELM cycle. The observed radiative effects paradoxically imply acceleration of electrons parallel to the magnetic field combined with rapid acquisition of perpendicular momentum. It is shown that this paradox can be resolved by the action of the anomalous Doppler instability which enables fast collective radiative relaxation, in the perpendicular direction, of electrons accelerated in the parallel direction by inductive electric fields generated by the initial ELM instability.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Tokamaks, Edge-localized modes
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 27 March 2015
Dates:
DateEvent
27 March 2015Published
30 October 2014Submitted
Date of first compliant deposit: 29 December 2015
Volume: Volume 114
Number: Number 12
Article Number: Article number 125004
DOI: 10.1103/PhysRevLett.114.125004
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Research Councils UK (RCUK), University of York, Engineering and Physical Sciences Research Council (EPSRC), Euratom
Grant number: EP/I501045 (RCUK), EP/H016732 (EPSRC)

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