Weak collisionless shocks in laser-plasmas
Weak collisionless shocks in laser-plasmas
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DOI：
10.1088/0741-3335/57/4/044008
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发表时间：
2015-04-01
影响因子：
2.2
通讯作者：
Norreys, P.
中科院分区：
文献类型：
--
作者：
Cairns, R. A.;Bingham, R.;Norreys, P.
我们得到一个理论描述层流冲击状结构在无碰撞等离子体和检查的参数限制，在离子声马赫数和电子/离子的温度比，在这些结构存在。其基本特征是包含有限的离子温度的结果，一些离子被反射从一个潜在的斜坡。这破坏了上游和下游区域之间的对称性，否则会给出众所周知的离子孤波解。我们之前已经表明（凯恩斯等人，2014年，《物理等离子体》，21 022112），这种结构可能与一些问题有关，例如在激光压缩小球和离子的激光加速中观察到的强局部电场的存在。在这里，我们介绍了这些结构可能在聚变靶中产生物质分离的方式的结果，并建议可以使用冲击离子加速来快速点火。
We obtain a theory describing laminar shock-like structures in a collisionless plasma and examine the parameter limits, in terms of the ion sound Mach number and the electron/ion temperature ratio, within which these structures exist. The essential feature is the inclusion of finite ion temperature with the result that some ions are reflected from a potential ramp. This destroys the symmetry between upstream and downstream regions that would otherwise give the well-known ion solitary wave solution. We have shown earlier (Cairns et al 2014 Phys. Plasmas 21 022112) that such structures may be relevant to problems such as the existence of strong, localized electric fields observed in laser compressed pellets and laser acceleration of ions. Here we present results on the way in which these structures may produce species separation in fusion targets and suggest that it may be possible to use shock ion acceleration for fast ignition.