Time-resonant tokamak plasma edge instabilities?

TitleTime-resonant tokamak plasma edge instabilities?
Publication TypeJournal Article
Year of Publication2014
AuthorsA.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
JournalPlasma Physics and Controlled Fusion
Volume56
Issue7
Number7
Pagination075017
Date PublishedJul
ISBN Number0741-3335
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.

URLhttp://www.euro-fusionscipub.org/wp-content/uploads/2014/11/EFDP13058.pdf
DOI10.1088/0741-3335/56/7/075017
Division

FP

Department

PDG

PID

63d8b3401376cbc0bda7a01df91ddc7b

Alternate TitlePlasma Phys. Control. Fusion
LabelOA

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