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Title: Theoretic base of Edge Local Mode triggering by vertical displacements

Vertical instability is studied with R-dependent displacement. For Solovev's configuration, the stability boundary of the vertical instability is calculated. The pressure gradient is a destabilizing factor which is contrary to Rebhan's result. Equilibrium parallel current density, j{sub //}, at plasma boundary is a drive of the vertical instability similar to Peeling-ballooning modes; however, the vertical instability cannot be stabilized by the magnetic shear which tends towards infinity near the separatrix. The induced current observed in the Edge Local Mode (ELM) triggering experiment by vertical modulation is derived. The theory provides some theoretic explanation for the mitigation of type-I ELMS on ASDEX Upgrade. The principle could be also used for ITER.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3]
  1. Southwestern Institute of Physics, Chengdu 610041 (China)
  2. (China)
  3. College of Physics Science and Technology, Sichuan University, Chengdu 610065 (China)
Publication Date:
OSTI Identifier:
22410287
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASDEX TOKAMAK; BALLOONING INSTABILITY; CONFIGURATION; CURRENT DENSITY; EDGE LOCALIZED MODES; EQUILIBRIUM; ITER TOKAMAK; MAGNETIC FIELDS; MODULATION; PLASMA; PRESSURE GRADIENTS; SHEAR