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Title: Study of self-consistent particle flows in a plasma blob with particle-in-cell simulations

The self-consistent particle flows in a filamentary coherent structure along the magnetic field line in scrape-off layer (SOL) plasma (plasma blob) have been investigated by means of a three-dimensional electrostatic particle-in-cell simulation code. The presence of the spiral current system composed of the diamagnetic and parallel currents in a blob is confirmed by the particle simulation without any assumed sheath boundary models. Furthermore, the observation of the electron and ion parallel velocity distributions in a blob shows that those distributions are far from Maxwellian due to modification with the sheath formation and that the electron temperature on the higher potential side in a blob is higher than that on the lower potential side. Also, it is found that the ions on the higher potential side are accelerated more intensively along the magnetic field line than those on the lower potential side near the edge. This study indicates that particle simulations are able to provide an exact current closure to analysis of blob dynamics and will bring more accurate prediction of plasma transport in the SOL without any empirical assumptions.
Authors:
;  [1] ;  [2]
  1. Department of Helical Plasma Research, National Institute for Fusion Science, Toki 509-5292 (Japan)
  2. (The Graduate University for Advanced Studies), Toki 509-5292 (Japan)
Publication Date:
OSTI Identifier:
22486419
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; 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; BOLTZMANN STATISTICS; CURRENTS; ELECTRON TEMPERATURE; ELECTRONS; IONS; MAGNETIC FIELDS; MODIFICATIONS; PARTICLES; PLASMA; PLASMA SCRAPE-OFF LAYER; PLASMA SHEATH; SIMULATION; THREE-DIMENSIONAL CALCULATIONS