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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
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, Engineering and Medicine > 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: |
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| 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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