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Title: Propagation characteristics of dust–acoustic waves in presence of a floating cylindrical object in the DC discharge plasma

Abstract

The experimental observation of the self–excited dust acoustic waves (DAWs) and its propagation characteristics in the absence and presence of a floating cylindrical object is investigated. The experiments are carried out in a direct current (DC) glow discharge dusty plasma in a background of argon gas. Dust particles are found levitated at the interface of plasma and cathode sheath region. The DAWs are spontaneously excited in the dust medium and found to propagate in the direction of ion drift (along the gravity) above a threshold discharge current at low pressure. Excitation of such a low frequency wave is a result of the ion–dust streaming instability in the dust cloud. Characteristics of the propagating dust acoustic wave get modified in the presence of a floating cylindrical object of radius larger than that of the dust Debye length. Instead of propagation in the vertical direction, the DAWs are found to propagate obliquely in the presence of the floating object (kept either vertically or horizontally). In addition, a horizontally aligned floating object forms a wave structure in the cone shaped dust cloud in the sheath region. Such changes in the propagation characteristics of DAWs are explained on the basis of modified potential (ormore » electric field) distribution, which is a consequence of coupling of sheaths formed around the cylindrical object and the cathode.« less

Authors:
 [1];  [2]; ;  [1]
  1. Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)
  2. (India)
Publication Date:
OSTI Identifier:
22599928
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ARGON; CATHODES; CYLINDRICAL CONFIGURATION; DEBYE LENGTH; DIRECT CURRENT; DUSTS; ELECTRIC FIELDS; EXCITATION; GLOW DISCHARGES; ION DRIFT; IONS; PARTICLES; PLASMA; SOUND WAVES

Citation Formats

Choudhary, Mangilal, E-mail: mangilal@ipr.res.in, Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, Mukherjee, S., and Bandyopadhyay, P.. Propagation characteristics of dust–acoustic waves in presence of a floating cylindrical object in the DC discharge plasma. United States: N. p., 2016. Web. doi:10.1063/1.4960667.
Choudhary, Mangilal, E-mail: mangilal@ipr.res.in, Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, Mukherjee, S., & Bandyopadhyay, P.. Propagation characteristics of dust–acoustic waves in presence of a floating cylindrical object in the DC discharge plasma. United States. doi:10.1063/1.4960667.
Choudhary, Mangilal, E-mail: mangilal@ipr.res.in, Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, Mukherjee, S., and Bandyopadhyay, P.. Mon . "Propagation characteristics of dust–acoustic waves in presence of a floating cylindrical object in the DC discharge plasma". United States. doi:10.1063/1.4960667.
@article{osti_22599928,
title = {Propagation characteristics of dust–acoustic waves in presence of a floating cylindrical object in the DC discharge plasma},
author = {Choudhary, Mangilal, E-mail: mangilal@ipr.res.in and Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085 and Mukherjee, S. and Bandyopadhyay, P.},
abstractNote = {The experimental observation of the self–excited dust acoustic waves (DAWs) and its propagation characteristics in the absence and presence of a floating cylindrical object is investigated. The experiments are carried out in a direct current (DC) glow discharge dusty plasma in a background of argon gas. Dust particles are found levitated at the interface of plasma and cathode sheath region. The DAWs are spontaneously excited in the dust medium and found to propagate in the direction of ion drift (along the gravity) above a threshold discharge current at low pressure. Excitation of such a low frequency wave is a result of the ion–dust streaming instability in the dust cloud. Characteristics of the propagating dust acoustic wave get modified in the presence of a floating cylindrical object of radius larger than that of the dust Debye length. Instead of propagation in the vertical direction, the DAWs are found to propagate obliquely in the presence of the floating object (kept either vertically or horizontally). In addition, a horizontally aligned floating object forms a wave structure in the cone shaped dust cloud in the sheath region. Such changes in the propagation characteristics of DAWs are explained on the basis of modified potential (or electric field) distribution, which is a consequence of coupling of sheaths formed around the cylindrical object and the cathode.},
doi = {10.1063/1.4960667},
journal = {Physics of Plasmas},
number = 8,
volume = 23,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}