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.

引用

页数：5

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