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Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC

[RP1.040] Simulations and Stability Analysis of JET H-mode Triangularity and Power Scans

T. Onjun, A. H. Kritz, G. Bateman (Lehigh University, Bethlehem, PA, USA), V. Parail, H. Wilson (Euratom/UKAEA, Culham Science Centre, Abingdon, UK), J. Lönnroth (EURATOM-Tekes, Helsinki U. of Tech., Finland), G. Huysmans (Euratom-CEA, Cadarache, France), A. Dnestrovskij (Kurchatov Institute, Moscow, Russia)

Four JET H-mode discharges in a triangularity scan and three JET H-mode discharges in a power scan are simulated using the JETTO code. The simulation results are analyzed using the HELENA and MISHKA stability codes. In the JETTO simulations, periodic ELM crashes are triggered either by a pressure-driven mode or by a current-driven mode. For the triangularity scan, the variation of the pedestal height, which is caused by the variation in MHD stability of finite-n ballooning/peeling modes with triangularity, is consistent with experiment. For the power scan, it is found that ELMs are triggered mainly by current-driven modes, where a significant part of the edge current is the bootstrap current that is driven by the edge pressure gradient. As a result of inductive effects between ELM crashes, higher-pressure gradients are achieved in the pedestal, as the heating power is increased, consistent with experiment.

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