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Title: Filament velocity scaling laws for warm ions

The dynamics of filaments or blobs in the scrape-off layer of magnetic fusion devices are studied by magnitude estimates of a comprehensive drift-interchange-Alfvén fluid model. The standard blob models are reproduced in the cold ion case. Even though usually neglected, in the scrape-off layer, the ion temperature can exceed the electron temperature by an order of magnitude. The ion pressure affects the dynamics of filaments amongst others by adding up to the interchange drive and the polarisation current. It is shown how both effects modify the scaling laws for filament velocity in dependence of its size. Simplifications for experimentally relevant limit regimes are given. These are the sheath dissipation, collisional, and electromagnetic regime.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ;  [4] ;  [5] ;  [3] ;  [2]
  1. Physik-Department E28, Technische Universität München, James-Franck-Str. 1, 85748 Garching (Germany)
  2. (Germany)
  3. Max-Planck-Institut für Plasmaphysik, EURATOM Assoziation, Boltzmannstr. 2, 85748 Garching (Germany)
  4. Center for Momentum Transport and Flow Organization, University of California at San Diego, San Diego 92093 (United States)
  5. Insitut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart, 70569 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
22218522
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; Other Information: (c) 2013 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; ALFVEN WAVES; ELECTRON TEMPERATURE; ION TEMPERATURE; IONS; PLASMA CONFINEMENT; PLASMA DRIFT; PLASMA FILAMENT; PLASMA FLUID EQUATIONS; PLASMA PRESSURE; PLASMA SCRAPE-OFF LAYER; PLASMA SHEATH; PLASMA SIMULATION; POLARIZATION; SCALING LAWS; THERMONUCLEAR DEVICES; VELOCITY