Monolayer plasma crystals: Experiments and simulations

被引：12

作者：

Goree, J ^{[1
]}

Samsonov, D ^{[1
]}

Ma, ZW ^{[1
]}

Bhattacharjee, A ^{[1
]}

Thomas, HM ^{[1
]}

Konopka, U ^{[1
]}

Morfill, GE ^{[1
]}

机构：

[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52246 USA

来源：

FRONTIERS IN DUSTY PLASMAS | 2000年

关键词：

D O I：

10.1016/B978-044450398-5/50014-2

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：

Experiments and simulations are reported for two kinds of monolayer plasma crystals. In a monolayer with a small number of particles, ranging from 1-19, we measured the microscopic structure of very small crystals. The crystals have concentric rings. For certain numbers of particles, corresponding to 'closed-shells' in the outermost ring, the configurations are the same as for hard spheres. Yukawa molecular-dynamics simulations accurately reproduce our experimentals results. By adding far more particles (similar to 10,000) and operating at higher power, we discovered Mach cones. These are V-shaped shocks created by supersonic objects. They were detected in a two-dimensional Coulomb crystal. Most particles were arranged in a monolayer, with a hexagonal lattice in a horizontal plane. Beneath the lattice plane, a sphere moved faster than the lattice sound speed. The resulting Mach cones were double, first compressional then rarefactive, due to the strongly-coupled crystalline state. Molecular dynamics simulations using a Yukawa potential also show multiple Mach cones.

引用

页码：91 / 97

页数：7

共 14 条

[1] EXPERIMENTAL AND FINITE-DIFFERENCE MODELING OF BOREHOLE MACH WAVES [J].