Journal Article

FZJ-2014-06276

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Time-resonant tokamak plasma edge instabilities?

Webster, A. J. (Corresponding Author) ; Dendy, R. O. ; Calderon, F. A. ; Chapman, S. C. ; Delabie, E.FZJ* ; Dodt, D. ; Felton, R. ; Todd, T. N. ; Maviglia, F. ; Morris, J. ; Riccardo, V. ; Alper, B. ; Brezinsek, S.FZJ* ; Coad, P. ; Likonen, J. ; Rubel, M.

2014
IOP Publ. Bristol

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/15746  doi: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

---

Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 135 - Plasma-wall interactions (POF2-135) (POF2-135)

Appears in the scientific report 2014

---

Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---