...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >X-ray generation mechanisms in three-dimensional simulations of wire array Z-pinches
【24h】

X-ray generation mechanisms in three-dimensional simulations of wire array Z-pinches

机译：线阵列Z夹点的三维模拟中的X射线生成机制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Resistive magneto-hydrodynamic (MHD) simulations are used to evaluate the influence of three-dimensional inhomogeneities on x-ray power production in wire array Z-pinches. In particular, we concentrate on simulations of wire array Z-pinch experiments on the MAGPIE generator at Imperial College. An initial temperature perturbation is used to stimulate variations in wire core ablation rates that result in a highly non-uniform final implosion. Results indicate that x-ray power production is governed by the symmetry of the implosion surface and by the rate at which current can transfer to the axis through a three-dimensional debris field that trails behind the main implosion. The peak power is ultimately limited by the growth of MHD instabilities in the stagnated pinch. The individual contributions of the implosion kinetic energy, compression of the stagnated pinch, ohmic heating and MHD instabilities to the radiation yield are quantified. The onset of m = 1 instabilities is found to provide an efficient mechanism for dissipation of the magnetic energy surrounding the stagnated pinch. The formation of a helical plasma column not only allows the magnetic field to do work in driving an expansion of the helix but also enhances the ohmic heating by elongating the path of the current through the pinch. The effect of these energy sources combined is to increase the radiation yield to typically 3 1/2 times the kinetic energy of the implosion. Simulations of arrays with different wire numbers, wire material and with nested arrays are used to examine the mechanisms that influence the peak soft x-ray power. In the simulations, peak power can be increased by: increasing the number of wires (which improves the implosion symmetry), by increasing the atomic number of the material (which increases the compressibility of the plasma) and by using a nested inner array (which brings the mass and the current to the axis more efficiently than a single array).
机译：电阻磁流体动力学（MHD）模拟用于评估三维非均质性对线阵列Z形夹中x射线发电的影响。特别是，我们专注于帝国理工学院MAGPIE发生器上的线阵列Z捏实验的仿真。初始温度扰动用于刺激线芯烧蚀速率的变化，从而导致高度不均匀的最终内爆。结果表明，X射线功率的产生取决于内爆表面的对称性以及电流可以通过落后于主要内爆的三维碎屑场传递到轴的速率。峰值功率最终受停滞夹点中MHD不稳定性的增长限制。量化了内爆动能，停滞收缩的压缩，欧姆加热和MHD不稳定性对辐射产率的单独贡献。发现m = 1不稳定性的开始提供了一种用于耗散停滞夹点周围的磁能的有效机制。螺旋等离子柱的形成不仅允许磁场在驱动螺旋的膨胀中起作用，而且还通过延长通过夹点的电流路径来增强欧姆加热。这些能源的综合作用是将辐射产量提高到通常为内爆动能的3 1/2倍。具有不同线号，线材和嵌套阵列的阵列仿真用于检查影响峰值软X射线功率的机制。在仿真中，可以通过以下方法来提高峰值功率：增加导线的数量（这将改善内爆对称性），通过增加材料的原子数（从而增加等离子体的可压缩性）以及使用嵌套的内部阵列（可以比单个阵列更有效地将质量和电流传递给轴）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号