Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions
| Autor: | Zhukhovitskii, D. I., Fortov, V. E., Molotkov, V. I., Lipaev, A. M., Naumkin, V. N., Thomas, H. M., Ivlev, A. V., Schwabe, M., Morfill, G. E. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Phys. Plasmas 22, 023701 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4907221 |
| Popis: | 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. Comment: 5 pages, 2 figures, 1 table |
| Databáze: | arXiv |
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