ELMs and strike point movements

Emilia R. Solano, S. Jachmich, F. Villone, N. Hawkes, Y. Corre, B. Alper, A. Loarte, R.A. Pitts, K. Guenther, A. Korotkov, M. Stamp, P. Andrew, J. Conboy, T. Bolzonella, M. Kempenaars, A. Cenedese, E. Rachlew

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Abstract

A detailed study of position changes of plasma strike points before and after edge localized modes (ELMs) in JET was carried out. A hypothesis being tested is that in an ELM previously closed edge field lines would open up, releasing plasma current and leading to the formation of a new, smaller separatrix. It was observed that after each ELM strike points have shifted a few centimetres towards the plasma centre (up in JET). In some cases a transient (10 cm) jump of strike positions was observed first. It was followed by an equally fast jump down to the shifted strike positions. Such behaviour has not been described in previous computational models of the ELM. Therefore two novel instability mechanisms are presented, which contribute to explain the changes in strike point position: an X-point instability, due to positive toroidal current density at the X-point, and a diamagnetic instability, due to negative inboard toroidal current density. © 2008 IAEA, Vienna.
Original languageEnglish
Article number065005
Pages (from-to)-
JournalNuclear Fusion
Volume48
Issue number6
DOIs
Publication statusPublished - 1 Jun 2008
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Solano, E. R., Jachmich, S., Villone, F., Hawkes, N., Corre, Y., Alper, B., ... Rachlew, E. (2008). ELMs and strike point movements. Nuclear Fusion, 48(6), -. [065005]. https://doi.org/10.1088/0029-5515/48/6/065005