Investigation of pellet-triggered MHD events in the ASDEX upgrade

Journal Article · Mon Sep 15 00:00:00 EDT 2008 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X08090018· OSTI ID:21399980

Lang, P T; Lackner, K; Kallenbach, A; Maraschek, M; Perez von Thun, C P; Suttrop, W ^[1]

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1. EURATOM Association, Max-Planck-Institut fuer Plasmaphysik (Germany)

In order to gain deeper insight into the process of MHD activity triggered by pellets we extended our previous analysis (standard type-I edge localized modes (ELMs)) to type-I ELMs in radiative edge scenarios, type-III ELMs, the quiescent H-mode regime, and core mode activity such as neoclassical tearing modes or snakes. Pellet triggering of mode activity has turned out to be a quite general feature, but only in case of the ELMs can it be unambiguously attributed to prompt local impact by the pellet. For edge plasma conditions characterized by higher resistivity, the growth time of spontaneous ELMs increases while the plasma changes from the type-I into the type-III regime. However, pellet-triggered ELMs retain fast rise times. In the quiescent Hmode, pellets still trigger ELM-like mode activity, but no longer accompanied by a significant release of energy from the plasma.

• OSTI ID: 21399980
• Journal Information: Plasma Physics Reports, Vol. 34, Issue 9; Other Information: DOI: 10.1134/S1063780X08090018; Copyright (c) 2008 Pleiades Publishing, Ltd.; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASDEX TOKAMAK
EDGE LOCALIZED MODES
H-MODE PLASMA CONFINEMENT
MAGNETOHYDRODYNAMICS
PELLETS
TEARING INSTABILITY
CLOSED PLASMA DEVICES
CONFINEMENT
FLUID MECHANICS
HYDRODYNAMICS
INSTABILITY
MAGNETIC CONFINEMENT
MECHANICS
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES