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Title: Finite system size effects on drift wave stability

Unstable electrostatic resistive modes, driven by density gradients, are identified in a bounded sheared slab. The boundary conditions play a crucial role and are shown to change the nature of the problem, which is related to so called “universal” mode. The dispersion relation and the structure of the eigenmodes of the instability are derived and are shown to depend on a limited set of dimensionless parameters. The occurrence and possible impact of these modes on numerical simulations and actual plasmas are discussed.
Authors:
 [1] ;  [2] ;  [3]
  1. EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)
  2. CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France)
  3. Imperial College of Science, Technology and Medicine, London (United Kingdom)
Publication Date:
OSTI Identifier:
22252050
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 Euratom; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; COMPUTERIZED SIMULATION; DISPERSION RELATIONS; INSTABILITY; PLASMA; SHEAR; SLABS; WAVE PROPAGATION