Community Research and Development Information Service - CORDIS

Abstract

The plasma edge MHD stability is analysed for several JET discharges in the diagnostic optimized configuration. The stability analysis of Type I ELMy plasmas shows how after an edge localized mode (ELM) crash the plasma edge is deep in the stable region against low- to intermediate-n peeling-ballooning modes. As the pressure gradient steepens and the edge current builds up, the plasma reaches the low- to intermediate-n peeling-ballooning mode stability boundary just before the ELM crash. Increasing the plasma fuelling by gas puffing makes the second stability access against high-n ballooning modes narrower until it closes completely and the ELMs change from Type I to Type III. Reducing the plasma heating has a similar effect. Increasing the safety factor at the plasma edge improves the stability against low- to intermediate-n modes allowing steeper pressure gradients to develop before an ELM crash.

Additional information

Authors: SAARELMA S, Association EURATOM-TEKES, Helsinki University of Technology (FI);LÖNNROTH J, Association EURATOM-TEKES, Helsinki University of Technology (FI);PARAIL V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ANDREW Y, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);KOROTKOV A, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);DE LA LUNA E, Associacion EURATOM-CIEMAT para Fusion, Madrid (ES);KALLENBACH A, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);STOBER J, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);SUTTROP W, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);KEMPENAARS M, FOM-Rijnhuisen, Association EURATOM-FOM, Nieuwegein (NL);LOARTE A, EFDA Close Support Unit, Garching (DE);MONIER-GARBET P, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 47 (2005) 713-731
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0741-3335/47/5/003
Record Number: 200719076 / Last updated on: 2007-04-11
Category: PUBLICATION
Original language: en
Available languages: en