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Time-resonant tokamak plasma edge instabilities?
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2014 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 56, no 7, 075017- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 56, no 7, 075017- p.
Keyword [en]
tokamak, plasma, stability, ELMs, statistics
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-148361DOI: 10.1088/0741-3335/56/7/075017ISI: 000338515300018ScopusID: 2-s2.0-84902969835OAI: diva2:736360

QC 20140806

Available from: 2014-08-06 Created: 2014-08-05 Last updated: 2014-08-06Bibliographically approved

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Rubel, Marek
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Fusion Plasma PhysicsAlfvén Laboratory Centre for Space and Fusion Plasma Physics
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