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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.

preprint2015arXivOpen access
D. I. ZhukhovitskiiV. E. FortovV. I. MolotkovA. M. LipaevV. N. NaumkinH. M. ThomasA. V. IvlevM. SchwabeG. E. Morfill
physics.plasm-ph
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Open access9 authors1 topic
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D. I. ZhukhovitskiiV. E. FortovV. I. MolotkovA. M. LipaevV. N. NaumkinH. M. ThomasA. V. IvlevM. SchwabeG. E. Morfill

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