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

Abstract

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

Citation Formats

Zhukhovitskii, D. I., E-mail: dmr@ihed.ras.ru, Fortov, V. E., Molotkov, V. I., Lipaev, A. M., Naumkin, V. N., Thomas, H. M., Ivlev, A. V., Morfill, G. E., and Schwabe, M. Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions. United States: N. p., 2015. Web. doi:10.1063/1.4907221.
Zhukhovitskii, D. I., E-mail: dmr@ihed.ras.ru, Fortov, V. E., Molotkov, V. I., Lipaev, A. M., Naumkin, V. N., Thomas, H. M., Ivlev, A. V., Morfill, G. E., & Schwabe, M. Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions. United States. doi:10.1063/1.4907221.
Zhukhovitskii, D. I., E-mail: dmr@ihed.ras.ru, Fortov, V. E., Molotkov, V. I., Lipaev, A. M., Naumkin, V. N., Thomas, H. M., Ivlev, A. V., Morfill, G. E., and Schwabe, M. Sun . "Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions". United States. doi:10.1063/1.4907221.
@article{osti_22408154,
title = {Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions},
author = {Zhukhovitskii, D. I., E-mail: dmr@ihed.ras.ru and Fortov, V. E. and Molotkov, V. I. and Lipaev, A. M. and Naumkin, V. N. and Thomas, H. M. and Ivlev, A. V. and Morfill, G. E. and Schwabe, M.},
abstractNote = {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.},
doi = {10.1063/1.4907221},
journal = {Physics of Plasmas},
number = 2,
volume = 22,
place = {United States},
year = {Sun Feb 15 00:00:00 EST 2015},
month = {Sun Feb 15 00:00:00 EST 2015}
}