用于自由电子激光泵浦X射线激光实验的铜L边X射线滤光片的设计与测量

Design and measurement of a Cu L-edge x-ray filter for free electron laser pumped x-ray laser experiments.

作者信息

Dunn J, London R A, Cone K V, Rocca J J, Rohringer N

机构信息

Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA.

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10E330. doi: 10.1063/1.3495769.

DOI:10.1063/1.3495769

PMID:21034028

Abstract

An inner-shell photoionized x-ray laser pumped by the Linac Coherent Light Source (LCLS) free electron laser has been proposed recently. The measurement of the on-axis 849 eV Ne Kα laser and protection of the x-ray spectrometer from damage require attenuation of the 1 keV LCLS beam. An Al/Cu foil combination is well suited, serving as a low energy bandpass filter below the Cu L-edge at 933 eV. A high resolution grating spectrometer is used to measure the transmission of a candidate filter with an intense laser-produced x-ray backlighter developed at the Lawrence Livermore National Laboratory Jupiter Laser Facility Janus. The methodology and discussion of the observed fine structure above the Cu L-edge will be presented.

摘要

最近有人提出利用直线加速器相干光源（LCLS）自由电子激光泵浦的内壳层光致电离X射线激光。对轴上849 eV的Ne Kα激光进行测量以及保护X射线光谱仪不受损坏，需要衰减1 keV的LCLS光束。铝/铜箔组合非常合适，可作为低于933 eV铜L边的低能带通滤波器。使用高分辨率光栅光谱仪，通过劳伦斯利弗莫尔国家实验室木星激光设施的Janus装置产生的强激光X射线背光源，来测量候选滤波器的透射率。本文将介绍在铜L边之上观察到的精细结构的方法和讨论。