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Title: Plasma response to electron energy filter in large volume plasma device

An electron energy filter (EEF) is embedded in the Large Volume Plasma Device plasma for carrying out studies on excitation of plasma turbulence by a gradient in electron temperature (ETG) described in the paper of Mattoo et al. [S. K. Mattoo et al., Phys. Rev. Lett. 108, 255007 (2012)]. In this paper, we report results on the response of the plasma to the EEF. It is shown that inhomogeneity in the magnetic field of the EEF switches on several physical phenomena resulting in plasma regions with different characteristics, including a plasma region free from energetic electrons, suitable for the study of ETG turbulence. Specifically, we report that localized structures of plasma density, potential, electron temperature, and plasma turbulence are excited in the EEF plasma. It is shown that structures of electron temperature and potential are created due to energy dependence of the electron transport in the filter region. On the other hand, although structure of plasma density has origin in the particle transport but two distinct steps of the density structure emerge from dominance of collisionality in the source-EEF region and of the Bohm diffusion in the EEF-target region. It is argued and experimental evidence is provided for existence ofmore » drift like flute Rayleigh-Taylor in the EEF plasma.« less
Authors:
; ; ; ; ; ;  [1]
  1. Institute for Plasma Research, Gandhinagar, 382 428 Gujarat (India)
Publication Date:
OSTI Identifier:
22218323
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 12; 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; DIFFUSION; DRIFT INSTABILITY; ELECTRON TEMPERATURE; ENERGY DEPENDENCE; EXCITATION; ION TEMPERATURE; LANGMUIR PROBE; MAGNETIC FIELDS; PLASMA DENSITY; PLASMA POTENTIAL; RAYLEIGH-TAYLOR INSTABILITY; TAIL ELECTRONS; TURBULENCE