用于国家点火装置上X射线汤姆逊散射的高效门控光谱仪的鉴定

Qualification of a high-efficiency, gated spectrometer for x-ray Thomson scattering on the National Ignition Facility.

作者信息

Döppner T, Kritcher A L, Neumayer P, Kraus D, Bachmann B, Burns S, Falcone R W, Glenzer S H, Hawreliak J, House A, Landen O L, LePape S, Ma T, Pak A, Swift D

机构信息

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

Gesellschaft für Schwerionenphysik, 64291 Darmstadt, Germany.

出版信息

Rev Sci Instrum. 2014 Nov;85(11):11D617. doi: 10.1063/1.4890253.

DOI:10.1063/1.4890253

PMID:25430193

Abstract

We have designed, built, and successfully fielded a highly efficient and gated Bragg crystal spectrometer for x-ray Thomson scattering measurements on the National Ignition Facility (NIF). It utilizes a cylindrically curved Highly Oriented Pyrolytic Graphite crystal. Its spectral range of 7.4-10 keV is optimized for scattering experiments using a Zn He-α x-ray probe at 9.0 keV or Mo K-shell line emission around 18 keV in second diffraction order. The spectrometer has been designed as a diagnostic instrument manipulator-based instrument for the NIF target chamber at the Lawrence Livermore National Laboratory, USA. Here, we report on details of the spectrometer snout, its novel debris shield configuration and an in situ spectral calibration experiment with a Brass foil target, which demonstrated a spectral resolution of E/ΔE = 220 at 9.8 keV.

摘要

我们设计、建造并成功部署了一台高效的门控布拉格晶体光谱仪，用于在美国国家点火装置（NIF）上进行X射线汤姆逊散射测量。它采用了圆柱形弯曲的高度取向热解石墨晶体。其7.4 - 10 keV的光谱范围针对使用9.0 keV的锌氦α X射线探针或约18 keV的钼K壳层线发射的二次衍射散射实验进行了优化。该光谱仪被设计为基于诊断仪器操纵器的仪器，用于美国劳伦斯利弗莫尔国家实验室的NIF靶室。在此，我们报告光谱仪探头的细节、其新颖的碎片屏蔽配置以及使用黄铜箔靶进行的原位光谱校准实验，该实验在9.8 keV处展示了E/ΔE = 220的光谱分辨率。