Modeling HEDLA magnetic field generation experiments on laser facilities
Modeling HEDLA magnetic field generation experiments on laser facilities
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DOI：
10.1016/j.hedp.2012.11.002
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发表时间：
2013-03-01
影响因子：
1.6
通讯作者：
Yurchak, R.
中科院分区：
文献类型：
--
作者：
Fatenejad, M.;Bell, A. R.;Yurchak, R.
Flash 中心正在进行一项合作，模拟激光驱动实验，旨在使用 FLASH 代码了解宇宙磁场的产生和放大。在这些实验中，激光照射固体塑料或石墨目标，将不对称冲击波发射到含有毫巴压力的氦气或氩气的腔室中。放置在距目标几厘米处的感应线圈可检测数十至数百高斯量级的大范围磁场。磁场的时间依赖性与爆炸波附近的比尔曼电池机制产生的磁场一致。尝试使用 FLASH 代码对这些实验进行模拟，发现了先前未报告的在模拟冲击波附近的比尔曼电池机制时存在的数值困难，冲击波可能导致产生大的非物理磁场。我们报告这些困难并提供潜在的解决方案。 (C) 2012 Elsevier B.V. 保留所有权利。
The Flash Center is engaged in a collaboration to simulate laser driven experiments aimed at understanding the generation and amplification of cosmological magnetic fields using the FLASH code. In these experiments a laser illuminates a solid plastic or graphite target launching an asymmetric blast wave into a chamber which contains either Helium or Argon at millibar pressures. Induction coils placed several centimeters away from the target detect large scale magnetic fields on the order of tens to hundreds of Gauss. The time dependence of the magnetic field is consistent with generation via the Biermann battery mechanism near the blast wave. Attempts to perform simulations of these experiments using the FLASH code have uncovered previously unreported numerical difficulties in modeling the Biermann battery mechanism near shock waves which can lead to the production of large non-physical magnetic fields. We report on these difficulties and offer a potential solution. (C) 2012 Elsevier B.V. All rights reserved.