国家点火装置的X射线区域背光源开发（特邀）

X-ray area backlighter development at the National Ignition Facility (invited).

作者信息

Barrios M A, Regan S P, Fournier K B, Epstein R, Smith R, Lazicki A, Rygg R, Fratanduono D E, Eggert J, Park H-S, Huntington C, Bradley D K, Landen O L, Collins G W

机构信息

Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.

出版信息

Rev Sci Instrum. 2014 Nov;85(11):11D502. doi: 10.1063/1.4891713.

DOI:10.1063/1.4891713

PMID:25430176

Abstract

1D spectral imaging was used to characterize the K-shell emission of Z ≈ 30-35 and Z ≈ 40-42 laser-irradiated foils at the National Ignition Facility. Foils were driven with up to 60 kJ of 3ω light, reaching laser irradiances on target between 0.5 and 20 × 10(15) W/cm(2). Laser-to-X-ray conversion efficiency (CE) into the Heα line (plus satellite emission) of 1.0%-1.5% and 0.15%-0.2% was measured for Z ≈ 30-32 and Z ≈ 40-42, respectively. Measured CE into Heα (plus satellite emission) of Br (Z = 35) compound foils (either KBr or RbBr) ranged between 0.16% and 0.29%. Measured spectra are compared with 1D non-local thermodynamic equilibrium atomic kinetic and radiation transport simulations, providing a fast and accurate predictive capability.

摘要

在国家点火装置中，利用一维光谱成像技术对Z≈30 - 35和Z≈40 - 42的激光辐照箔靶的K壳层发射进行了表征。箔靶由高达60千焦的三倍频光驱动，靶上激光辐照度在0.5至20×10¹⁵瓦/平方厘米之间。对于Z≈30 - 32和Z≈40 - 42，测量得到的Heα线（加上卫星辐射）的激光到X射线转换效率（CE）分别为1.0% - 1.5%和0.15% - 0.2%。测量得到的溴（Z = 35）复合箔靶（KBr或RbBr）的Heα（加上卫星辐射）的CE在0.16%至0.29%之间。将测量光谱与一维非局部热力学平衡原子动力学和辐射输运模拟进行了比较，提供了快速且准确的预测能力。