...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physics of plasmas >X-ray conversion efficiency of high-Z hohlraum wall materials for indirect drive ignition
【24h】

X-ray conversion efficiency of high-Z hohlraum wall materials for indirect drive ignition

机译：间接驱动点火的高Z霍尔姆壁材料的X射线转换效率

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

The conversion efficiency of 351 nm laser light to soft x rays (0.1-5 keV) was measured for Au, U, and high Z mixture "cocktails" used as hohlraum wall materials in indirect drive fusion experiments. For the spherical targets in a direct drive geometry, flattop laser pulses and laser smoothing with phase plates are employed to achieve constant and uniform laser intensities of 10(14) and 10(15) W/cm(2) over the target surface that are relevant for the future ignition experiments at the National Ignition Facility [G. H. Miller, E. I. Moses, and C. R. Wuest, Nucl. Fusion 44, 228 (2004)]. The absolute time and spectrally resolved radiation flux is measured with a multichannel soft x-ray power diagnostic. The conversion efficiency is then calculated by dividing the measured x-ray power by the incident laser power from which the measured laser backscattering losses are subtracted. After similar to 0.5 ns, the time resolved x-ray conversion efficiency reaches a slowly increasing plateau of 95% at 10(14) W/cm(2) laser intensity and of 80% at 10(15) W/cm(2). The M-band flux (2-5 keV) is negligible at 10(14) W/cm(2) reaching similar to 1% of the total x-ray flux for all target materials. In contrast, the M-band flux is significant and depends on the target material at 10(15) W/cm(2) laser intensity, reaching values between 10% of the total flux for U and 27% for Au. LASNEX simulations [G. B. Zimmerman and W. L. Kruer, Comm. Plasma Phys. Contr. Fusion 2, 51 (1975)] show good agreement in conversion efficiency and radiated spectra with data when using XSN atomic physics model and a flux limiter of 0.15, but they underestimate the generated M-band flux. (c) 2008 American Institute of Physics.
机译：对于在间接驱动聚变实验中用作ho壁材料的金，铀和高Z混合物“鸡尾酒”，测量了351 nm激光到软X射线（0.1-5 keV）的转换效率。对于直接驱动几何中的球形目标，采用平顶激光脉冲和相位板进行激光平滑，以在目标表面上获得恒定且均匀的10（14）和10（15）W / cm（2）的激光强度。与国家点火设施的未来点火实验有关[G. H. Miller，E。I. Moses和C. R. Wuest，Nucl。融合44，228（2004）]。绝对时间和光谱分辨辐射通量通过多通道软X射线功率诊断仪进行测量。然后通过将测量的X射线功率除以入射激光功率来计算转换效率，从中减去测量的激光反向散射损耗。经过约0.5 ns后，时间分辨的X射线转换效率在10（14）W / cm（2）的激光强度下达到95％的缓慢增加的平台，而在10（15）W / cm（2）的情况下达到80％的缓慢增加的平台。 。 M波段通量（2-5 keV）在10（14）W / cm（2）时可以忽略不计，达到所有目标材料的总X射线通量的1％。相反，M波段通量很大，并且取决于目标材料在10（15）W / cm（2）的激光强度下，其值介于U的总通量的10％和Au的总通量的27％之间。 LASNEX模拟[G. B.Zimmerman和W.L.Kruer，通讯。等离子物理控制Fusion 2，51（1975）]在使用XSN原子物理模型和通量限制器0.15的情况下，在转换效率和辐射光谱方面与数据显示出良好的一致性，但它们低估了所产生的M波段通量。 （c）2008年美国物理研究所。

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