skip to main content

SciTech ConnectSciTech Connect

Title: Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions

We report the first observation of the Mach cones excited by a larger microparticle (projectile) moving through a cloud of smaller microparticles (dust) in a complex plasma with neon as a buffer gas under microgravity conditions. A collective motion of the dust particles occurs as propagation of the contact discontinuity. The corresponding speed of sound was measured by a special method of the Mach cone visualization. The measurement results are incompatible with the theory of ion acoustic waves. The estimate for the pressure in a strongly coupled Coulomb system and a scaling law for the complex plasma make it possible to derive an evaluation for the speed of sound, which is in a reasonable agreement with the experiments in complex plasmas.
Authors:
; ; ; ;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Joint Institute of High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Bd. 2, 125412 Moscow (Russian Federation)
  2. Research Group Complex Plasma, DLR, Oberpfaffenhofen, 82234 Wessling (Germany)
  3. Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching (Germany)
  4. Department of Chemical and Biomolecular Engineering, Graves Lab, D75 Tan Hall, University of California, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
22408154
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 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; CONES; DUSTS; GRAVITATION; MACH NUMBER; MICROSTRUCTURE; NEON; PARTICLES; PLASMA; SCALING LAWS; SOUND WAVES