使用100皮秒17.5千电子伏特X射线背光源和布拉格衍射成像仪进行布拉格衍射。

Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager.

作者信息

Maddox B R, Park H-S, Hawreliak J, Elsholz A, Van Maren R, Remington B A, Comley A, Wark J S

机构信息

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

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10E522. doi: 10.1063/1.3491295.

DOI:10.1063/1.3491295

PMID:21034050

Abstract

A new diagnostic for measuring Bragg diffraction of petawatt-generated high-energy x rays off a laser-compressed crystal was designed and tested successfully at the Omega EP laser facility on static Mo and Ta (111) oriented single crystal samples using a 17.5 keV Mo Kα backlighter. The Bragg diffraction imager consists of a heavily shielded enclosure and a precisely positioned beam block attached to the enclosure by an aluminum arm. Fuji image plates are used as the x-ray detectors. The diffraction from Mo and Ta (222) crystal planes was clearly detected with a high signal-to-noise. This technique will be applied to shock- and quasi-isentropically loaded single crystals on the Omega EP laser.

摘要

一种用于测量拍瓦级高能X射线在激光压缩晶体上产生的布拉格衍射的新型诊断方法，在欧米伽EP激光装置上，使用17.5 keV的钼Kα背光源，对静态的钼和钽（111）取向的单晶样品进行了成功设计和测试。布拉格衍射成像仪由一个 heavily shielded enclosure 和一个通过铝臂连接到 enclosure 的精确定位的光束阻挡器组成。富士成像板用作X射线探测器。钼和钽（222）晶面的衍射被清晰地检测到，信噪比很高。该技术将应用于欧米伽EP激光上的冲击加载和准等熵加载的单晶。（注：文中“heavily shielded enclosure”未准确对应中文词汇，暂保留英文表述）