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Abstract

An ELMy ASDEX Upgrade plasma equilibrium is reconstructed taking into account the bootstrap current. The peeling mode stability of the equilibrium is numerically analyzed using the GATO [1] code, and it is found that the bootstrap current can drive the plasma peeling mode unstable. A high-n ballooning mode stability analysis of the equilibria revealed that, while destabilizing the peeling modes, the bootstrap current has a stabilizing effect on the ballooning modes. A combination of these two instabilities is a possible explanation for the type I ELM phenomenon. A triangularity scan showed that increasing triangularity stabilizes the peeling modes and can produce ELM-free periods observed in the experiments.

Additional information

Authors: SAARELMA S, Helsinki University of Technology, Euratom-TEKES Association (FI);KURKI-SUONIO T, Helsinki University of Technology, Euratom-TEKES Association (FI);GNTER S, Max-Planck Institut f³r Plasmaphysik, Garching (DE);ZEHRFELD H-P, Max-Planck Institut f³r Plasmaphysik, Garching (DE)
Bibliographic Reference: Article: Plasma Physics Controlled Fusion, Vol. 42 (2000) pp. A139-A145
Availability: Plasma Physics Controlled Fusion (Journal)
Record Number: 200012121 / Last updated on: 2000-07-12
Category: PUBLICATION
Original language: en
Available languages: en