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Time-resonant tokamak plasma edge instabilities?
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Webster, A. J., Dendy, R. O., Calderon, F. A., Chapman, Sandra C., Delabie, E., Dodt, D., Felton, R., Todd, T. N., Maviglia, F., Morris, J., Riccardo, V., Alper, B., Brezinsek, S., Coad, P., Likonen, J. and Rubel, M. (2014) Time-resonant tokamak plasma edge instabilities? Plasma Physics and Controlled Fusion, Volume 56 (Number 7). 075017. doi:10.1088/0741-3335/56/7/075017 ISSN 0741-3335.
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Official URL: http://dx.doi.org/10.1088/0741-3335/56/7/075017
Abstract
For a two week period during the Joint European Torus 2012 experimental campaign, the same high confinement plasma was repeated 151 times. The dataset was analysed to produce a probability density function (pdf) for the waiting times between edge-localized plasma instabilities (ELMs). The result was entirely unexpected. Instead of a smooth single peaked pdf, a succession of 4–5 sharp maxima and minima uniformly separated by 7–8 ms intervals was found. Here we explore the causes of this newly observed phenomenon, and conclude that it is either due to a naturally occurring self-organized plasma phenomenon or an interaction between the plasma and a real-time control system. If the maxima are a result of 'resonant' frequencies at which ELMs can be triggered more easily, then future ELM control techniques can, and probably will, use them. Either way, these results demand a deeper understanding of the ELM process.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 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: | 10 June 2014 | ||||||||
| Dates: |
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| Volume: | Volume 56 | ||||||||
| Number: | Number 7 | ||||||||
| Page Range: | 075017 | ||||||||
| DOI: | 10.1088/0741-3335/56/7/075017 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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