Observations of pressure anisotropy effects within semi-collisional magnetized plasma bubbles.
Observations of pressure anisotropy effects within semi-collisional magnetized plasma bubbles.
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DOI：
10.1038/s41467-020-20387-7
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发表时间：
2021-01-12
影响因子：
16.6
通讯作者：
Woolsey NC
中科院分区：
文献类型：
--
作者：
Tubman ER;Joglekar AS;Bott AFA;Borghesi M;Coleman B;Cooper G;Danson CN;Durey P;Foster JM;Graham P;Gregori G;Gumbrell ET;Hill MP;Hodge T;Kar S;Kingham RJ;Read M;Ridgers CP;Skidmore J;Spindloe C;Thomas AGR;Treadwell P;Wilson S;Willingale L;Woolsey NC
磁化等离子体相互作用在天体物理和实验室等离子体中普遍存在。各种物理效应已被证明是重要的碰撞等离子体流的影响，相反的磁场，然而，实验验证的机制内的相互作用区域仍然难以捉摸。在这里，我们讨论了激光等离子体实验，实验结果验证，比尔曼电池产生的磁场平流能斯特流和各向异性的压力效应占主导地位，这些流量中的重连区。这些领域映射使用时间分辨质子探测在多个方向。各种实验、建模和分析技术证明了各向异性压力在半碰撞、高β等离子体中的重要性，与电阻过程相比，各向异性压力导致重连场的幅度减小。各向异性压力动力学在无碰撞等离子体中至关重要，但在碰撞等离子体中往往被忽略。我们表明，压力各向异性是必不可少的，在维持相互作用层，重新分配磁场，即使是半碰撞，高能量密度物理（HEDP）制度。磁场可以通过等离子体流重组，并导致诸如磁重联之类的效应。在这里，作者探讨了磁化等离子体气泡在半碰撞制度和压力各向异性的作用，影响激光产生的等离子体的流动的演变。
Magnetized plasma interactions are ubiquitous in astrophysical and laboratory plasmas. Various physical effects have been shown to be important within colliding plasma flows influenced by opposing magnetic fields, however, experimental verification of the mechanisms within the interaction region has remained elusive. Here we discuss a laser-plasma experiment whereby experimental results verify that Biermann battery generated magnetic fields are advected by Nernst flows and anisotropic pressure effects dominate these flows in a reconnection region. These fields are mapped using time-resolved proton probing in multiple directions. Various experimental, modelling and analytical techniques demonstrate the importance of anisotropic pressure in semi-collisional, high-β plasmas, causing a reduction in the magnitude of the reconnecting fields when compared to resistive processes. Anisotropic pressure dynamics are crucial in collisionless plasmas, but are often neglected in collisional plasmas. We show pressure anisotropy to be essential in maintaining the interaction layer, redistributing magnetic fields even for semi-collisional, high energy density physics (HEDP) regimes. Magnetic fields can be reorganized by plasma flows and lead to effects such as magnetic reconnection. Here the authors explore the evolution of magnetized-plasma bubbles in a semi-collisional regime and the role of pressure anisotropy in influencing the flow of the laser-produced plasma.
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影响因子：
4.9
作者：
Ball, David;Ozel, Feryal;Sironi, Lorenzo
通讯作者：
Sironi, Lorenzo
影响因子：
2.2
作者：
Divin, A.;Markidis, S.;Biernat, H. K.
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Biernat, H. K.
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Fox, W.;Bhattacharjee, A.;Germaschewski, K.
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Germaschewski, K.
影响因子：
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作者：
Mackinnon, AJ;Patel, PK;Boehlly, T
通讯作者：
Boehlly, T
影响因子：
8.6
作者：
Nilson, P. M.;Willingale, L.;Krushelnick, K.
通讯作者：
Krushelnick, K.