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Title: A linear helicon plasma device with controllable magnetic field gradient

Abstract

Current free double layers (CFDLs) are localized potential structures having spatial dimensions - Debye lengths and potential drops of more than local electron temperature across them. CFDLs do not need a current for them to be sustained and hence they differ from the current driven double layers. Helicon antenna produced plasmas in an expanded chamber along with an expanding magnetic field have shown the existence of CFDL near the expansion region. A helicon plasma device has been designed, fabricated, and installed in the Institute for Plasma Research, India to study the role of maximum magnetic field gradient as well as its location with respect to the geometrical expansion region of the chamber in CFDL formation. The special feature of this machine consisting of two chambers of different radii is its capability of producing different magnetic field gradients near the physical boundary between the two chambers either by changing current in one particular coil in the direction opposite to that in other coils and/or by varying the position of this particular coil. Although, the machine is primarily designed for CFDL experiments, it is also capable of carrying out many basic plasma physics experiments such as wave propagation, wave coupling, and plasmamore » instabilities in a varying magnetic field topology. In this paper, we will present the details of the machine construction, its specialties, and some preliminary results about the production and characterization of helicon plasma in this machine.« less

Authors:
; ; ; ;  [1]
  1. Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)
Publication Date:
OSTI Identifier:
22093625
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 6; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; COUPLING; DEBYE LENGTH; ELECTRON TEMPERATURE; EXPANSION; ION TEMPERATURE; LAYERS; MAGNETIC FIELDS; PLASMA; PLASMA INSTABILITY; PLASMA WAVES; TOPOLOGY; WAVE PROPAGATION

Citation Formats

Barada, Kshitish K., Chattopadhyay, P. K., Ghosh, J., Kumar, Sunil, and Saxena, Y. C. A linear helicon plasma device with controllable magnetic field gradient. United States: N. p., 2012. Web. doi:10.1063/1.4723816.
Barada, Kshitish K., Chattopadhyay, P. K., Ghosh, J., Kumar, Sunil, & Saxena, Y. C. A linear helicon plasma device with controllable magnetic field gradient. United States. doi:10.1063/1.4723816.
Barada, Kshitish K., Chattopadhyay, P. K., Ghosh, J., Kumar, Sunil, and Saxena, Y. C. Fri . "A linear helicon plasma device with controllable magnetic field gradient". United States. doi:10.1063/1.4723816.
@article{osti_22093625,
title = {A linear helicon plasma device with controllable magnetic field gradient},
author = {Barada, Kshitish K. and Chattopadhyay, P. K. and Ghosh, J. and Kumar, Sunil and Saxena, Y. C.},
abstractNote = {Current free double layers (CFDLs) are localized potential structures having spatial dimensions - Debye lengths and potential drops of more than local electron temperature across them. CFDLs do not need a current for them to be sustained and hence they differ from the current driven double layers. Helicon antenna produced plasmas in an expanded chamber along with an expanding magnetic field have shown the existence of CFDL near the expansion region. A helicon plasma device has been designed, fabricated, and installed in the Institute for Plasma Research, India to study the role of maximum magnetic field gradient as well as its location with respect to the geometrical expansion region of the chamber in CFDL formation. The special feature of this machine consisting of two chambers of different radii is its capability of producing different magnetic field gradients near the physical boundary between the two chambers either by changing current in one particular coil in the direction opposite to that in other coils and/or by varying the position of this particular coil. Although, the machine is primarily designed for CFDL experiments, it is also capable of carrying out many basic plasma physics experiments such as wave propagation, wave coupling, and plasma instabilities in a varying magnetic field topology. In this paper, we will present the details of the machine construction, its specialties, and some preliminary results about the production and characterization of helicon plasma in this machine.},
doi = {10.1063/1.4723816},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 6,
volume = 83,
place = {United States},
year = {2012},
month = {6}
}