Title | Time-resonant tokamak plasma edge instabilities? |
Publication Type | Journal Article |
Year of Publication | 2014 |
Authors | A.J Webster, R.O Dendy, F.A Calderon, S.C Chapman, E. Delabie, D. Dodt, R. Felton, T.N Todd, F. Maviglia, J. Morris, V. Riccardo, B. Alper, S. Brezinsek, P. Coad, J. Likonen, M. Rubel, JET-EFDA Contributors |
Journal | Plasma Physics and Controlled Fusion |
Volume | 56 |
Issue | 7 |
Number | 7 |
Pagination | 075017 |
Date Published | Jul |
ISBN Number | 0741-3335 |
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. |
URL | http://www.euro-fusionscipub.org/wp-content/uploads/2014/11/EFDP13058.pdf |
DOI | 10.1088/0741-3335/56/7/075017 |
Division | FP |
Department | PDG |
PID | 63d8b3401376cbc0bda7a01df91ddc7b |
Alternate Title | Plasma Phys. Control. Fusion |
Label | OA |
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