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Title: Electromagnetic effects on dynamics of high-beta filamentary structures

The impacts of the electromagnetic effects on blob dynamics are considered. Electromagnetic BOUT++ simulations on seeded high-beta blobs demonstrate that inhomogeneity of magnetic curvature or plasma pressure along the filament leads to bending of the blob filaments and the magnetic field lines due to increased propagation time of plasma current (Alfvén time). The bending motion can enhance heat exchange between the plasma facing materials and the inner scrape-off layer (SOL) region. The effects of sheath boundary conditions on the part of the blob away from the boundary are also diminished by the increased Alfvén time. Using linear analysis and BOUT++ simulations, it is found that electromagnetic effects in high temperature and high density plasmas reduce the growth rate of resistive drift wave instability when resistivity drops below a certain value. The blobs temperature decreases in the course of its motion through the SOL and so the blob can switch from the electromagnetic to the electrostatic regime where resistive drift waves become important again.
Authors:
;  [1] ;  [2] ;  [3]
  1. University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093 (United States)
  2. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States)
  3. Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
22408001
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; 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; ALFVEN WAVES; BOUNDARY CONDITIONS; COMPUTERIZED SIMULATION; ELECTRIC CURRENTS; ELECTROSTATICS; FILAMENTS; HIGH-BETA PLASMA; INSTABILITY; MAGNETIC FIELDS; PLASMA DENSITY; PLASMA PRESSURE; PLASMA SCRAPE-OFF LAYER; WAVE PROPAGATION