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Position dependence of the unstable vertical movement of JET plasmas triggered by ELMs

  Fabio Villone, Valeria Riccardo, Filippo Sartori and Contributors to the EFDA-JET workprogramme
  2005
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Resumo
 
In this paper we report the results of a set of dedicated experiments carried out at JET, aimed at studying the spatial dependence of the excitation of the unstable mode following an edge localized mode (ELM). A dependence of the excitation of the unstable mode on the pre-ELM vertical position can indeed be found, although a neutral point is not present in the explored range. The CREATE L linearized plasma response model is used to reliably estimate the growth rate and discuss a correct global characterization of ELMs from the point of view of simplified modelling for control. The results indicate that a drop of pressure energy alone is not sufficient but that an increase of magnetic energy should be included
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