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29 March 2024
 
  » arxiv » 1411.7641

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Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions
D. I. Zhukhovitskii ; V. E. Fortov ; V. I. Molotkov ; A. M. Lipaev ; V. N. Naumkin ; H. M. Thomas ; A. V. Ivlev ; M. Schwabe ; G. E. Morfill ;
Date 27 Nov 2014
AbstractWe 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 fully incompatible with the theory of ion acoustic waves. We explore the analogy between a strongly coupled Coulomb system and a solid. A scaling law for the complex plasma makes it possible to derive a theoretical estimate for the speed of sound, which is in a reasonable agreement with the experiments in strongly coupled complex plasmas.
Source arXiv, 1411.7641
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