EFD-P(13)58 Time-Resonant Tokamak Plasma Edge Instabilities?
| Main 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 |
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| Format: | info publication-preprint Journal |
| Terbitan: |
, 2013
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| Online Access: |
https://zenodo.org/record/12059 |
Daftar Isi:
- For a two week period during the Joint European Torus (JET) 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-localised plasma instabilities ("ELMs"). The result was entirely unexpected. Instead of a smooth single peaked pdf, a succession of 45 sharp maxima and minima uniformly separated by 78 millisecond intervals was found. Here we explore the causes of this newly observed phenomenon, and conclude that it is either due to a self-organised 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 ELMing process.
- Preprint of Paper to be submitted for publication in Physical Review Letters