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Title: Experimental investigation of current free double layers in helicon plasmas

The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe measurements show multiple DLs, which are in connection with, the abrupt fall of densities along with potential drop of about 24 V and 18 V. The DLs strengths (e ΔV{sub p})/(k T{sub e}) are about 9.5 and 6, and the corresponding widths are about 6 and 5 D lengths. The potential drop is nearly equal to the thermal anisotropies between the two plasma regions forming the DL, which is present in the plateau region of mirror, unlike the earlier studies on the DL formation in the region of strong gradients in the magnetic field. Also, it presents a qualitative discussion on the mechanism of DL formation.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Applied Sciences and Humanities, Dronacharya College of Engineering, Gurgaon 123506 (India)
  2. Department of Physics, Indian Institute of Technology, New Delhi 110016 (India)
  3. Centre for Energy Studies, Indian Institute of Technology, New Delhi 110016 (India)
Publication Date:
OSTI Identifier:
22252105
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 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; LANGMUIR PROBE; MAGNETIC FIELDS; PLASMA; PLASMA DENSITY; POTENTIALS