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Title: Studies on hydrogen plasma and dust charging in low-pressure filament discharge

The effect of working gas pressure and dust charging on electron energy probability function has been studied for hydrogen plasma in a multi-dipole dusty plasma device. A cylindrical Langmuir probe is used to evaluate the plasma parameters and electron energy probability function (EEPF) for different working pressures. For lower energy range (below 10 eV), the EEPF follows a bi-Maxwellian shape at very low pressure (6 × 10{sup −5} mbar), while elevating the working pressure up to ∼2 × 10{sup −3} mbar, the shape of the EEPF transforms into a single Maxwellian. Some dip structures are observed at high energy range (ε > 10 eV) in the EEPF of hydrogen plasma at all the working conditions. In presence of dust particles, it is observed that the shape of the EEPF changes due to the redistribution of the high and low-energy electron populations. Finally, the effect of working pressure on charge accumulation on dust particles is studied with the help of a Faraday cup and electrometer. From the observations, a strong influence of working pressure on plasma parameters, EEPF and dust charging is observed.
Authors:
; ; ;  [1] ;  [2]
  1. Centre of Plasma Physics, Institute for Plasma Research, Nazirakhat, Sonapur 782 402, Kamrup, Assam (India)
  2. ITER-India, Institute for Plasma Research, Bhat, Gandhinagar 382 428 (India)
Publication Date:
OSTI Identifier:
22304439
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 8; 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; DIPOLES; ELECTROMETERS; ELECTRONS; EV RANGE 01-10; FARADAY CUPS; FILAMENTS; HYDROGEN; LANGMUIR PROBE; PLASMA; PRESSURE RANGE MILLI PA