论文标题
在磁性弱的碰撞状态下形成瞬态高$β$等离子体
Formation of Transient High-$β$ Plasmas in a Magnetized, Weakly Collisional Regime
论文作者
论文摘要
我们提供了实验数据，提供了同时弱磁化（即Hall Magnetization参数$ωτ> 1 $）的瞬态（$ \ sim 20〜μ $ s）等离子体形成的证据，并由热压（即热与磁性压力的比率）。粒子碰撞平均自由路径是整体系统大小的明显部分。这些等离子体是通过磁化同轴枪发射的两个等离子体的正面合并而形成的。比率$λ_{gun} =μ_0i_ {gun}/ψ_{gun_ {gun} $ of gun Current $ i_ {gun} $用于应用磁磁通$ $ $ $ $ {gun} $是探索$β$和$ωτ$的参数空间的实验旋钮。这些实验是在威斯康星血浆物理实验室的大红色球上进行的。这种等离子体的瞬时形成可能会为实验室研究开辟新的机制，以进行弱碰撞，磁化，高$β$等离子体物理学的实验室研究；与天体物理对象和现象相关的过程；以及用于磁惯性融合的新型磁化等离子体靶标。
We present experimental data providing evidence for the formation of transient ($\sim 20~μ$s) plasmas that are simultaneously weakly magnetized (i.e., Hall magnetization parameter $ωτ> 1$) and dominated by thermal pressure (i.e., ratio of thermal-to-magnetic pressure $β> 1$). Particle collisional mean free paths are an appreciable fraction of the overall system size. These plasmas are formed via the head-on merging of two plasmas launched by magnetized coaxial guns. The ratio $λ_{gun}=μ_0 I_{gun}/ψ_{gun}$ of gun current $I_{gun}$ to applied magnetic flux $ψ_{gun}$ is an experimental knob for exploring the parameter space of $β$ and $ωτ$. These experiments were conducted on the Big Red Ball at the Wisconsin Plasma Physics Laboratory. The transient formation of such plasmas can potentially open up new regimes for the laboratory study of weakly collisional, magnetized, high-$β$ plasma physics; processes relevant to astrophysical objects and phenomena; and novel magnetized plasma targets for magneto-inertial fusion.
