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

被引：16
|
作者：
Zhukhovitskii, D. I. [1 ]
Fortov, V. E. [1 ]
Molotkov, V. I. [1 ]
Lipaev, A. M. [1 ]
Naumkin, V. N. [1 ]
Thomas, H. M. [2 ]
Ivlev, A. V. [3 ]
Schwabe, M. [4 ]
Morfill, G. E. [3 ]
机构：
[1] Russian Acad Sci, Joint Inst High Temp, Moscow 125412, Russia
[2] DLR, Res Grp Complex Plasma, D-82234 Oberpfaffenhofen, Wessling, Germany
[3] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[4] Univ Calif Berkeley, Graves Lab, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA
来源：
PHYSICS OF PLASMAS | 2015年 / 22卷 / 02期
基金：
俄罗斯科学基金会;
关键词：
DUSTY; CRYSTAL;
D O I：
10.1063/1.4907221
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
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. (C) 2015 AIP Publishing LLC.
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页数：5
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