Characterizing counter-streaming interpenetrating plasmas relevant to astrophysical collisionless shocks-猫眼课题宝

DOI：

10.1063/1.3694124

发表时间：

2011-11

期刊：

Physics of Plasmas

影响因子：

2.2

通讯作者：

中科院分区：

物理与天体物理3区

文献类型：

作者：

J. Ross;S. Glenzer;P. Amendt;R. Berger;L. Divol;N. Kugland;O. Landen;C. Plechaty;B. Remington;D. Ryutov;W. Rozmus;D. Froula;G. Fiksel;C. Sorce;Y. Kuramitsu;T. Morita;Y. Sakawa;H. Takabe;R. P. Drake;M. Grosskopf;C. Kuranz;G. Gregori;J. Meinecke;C. Murphy;M. Koenig;A. Pelka;A. Ravasio;T. Vinci;E. Liang;R. Presura;A. Spitkovsky;F. Miniati;H. Park

一系列 Omega 实验已经产生并表征了与无碰撞冲击的产生相关的高速逆流等离子体流。单层和双层 CH2 箔已用约 1016 W/cm2 的激光强度进行辐照。使用汤姆逊散射对距离箔表面 4 毫米处的激光烧蚀等离子体进行表征。在单箔配置中测得峰值等离子体流速为 2000 km/s，电子温度为 ∼ 110 eV，离子温度为 ∼ 30 eV，密度为 ∼ 1018 cm−3。在双箔几何形状中可以看到电子和离子温度显着增加。测量的单箔等离子体条件用于计算离子趋肤深度 c/ωpi∼0.16 mm、相互作用长度 lint ∼ 8 mm 以及库仑平均自由程 λmfp∼27mm。通过 c/ωpi≪lint≪λmfp，我们处于一种可以形成无碰撞激波的状态。

A series of Omega experiments have produced and characterized high velocity counter-streaming plasma flows relevant for the creation of collisionless shocks. Single and double CH2 foils have been irradiated with a laser intensity of ∼ 1016 W/cm2. The laser ablated plasma was characterized 4 mm from the foil surface using Thomson scattering. A peak plasma flow velocity of 2000 km/s, an electron temperature of ∼ 110 eV, an ion temperature of ∼ 30 eV, and a density of ∼ 1018 cm−3 were measured in the single foil configuration. Significant increases in electron and ion temperatures were seen in the double foil geometry. The measured single foil plasma conditions were used to calculate the ion skin depth, c/ωpi∼0.16 mm, the interaction length, lint, of ∼ 8 mm, and the Coulomb mean free path, λmfp∼27mm. With c/ωpi≪lint≪λmfp, we are in a regime where collisionless shock formation is possible.

Characterizing counter-streaming interpenetrating plasmas relevant to astrophysical collisionless shocks

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