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Demonstration of a laser-driven, narrow spectral bandwidth x-ray source for collective x-ray scattering experiments
Physics of Plasmas ( IF 2.2 ) Pub Date : 2021-03-15 , DOI: 10.1063/5.0030958
M. J. MacDonald 1, 2 , A. M. Saunders 1 , B. Bachmann 1 , M. Bethkenhagen 3, 4 , L. Divol 1 , M. D. Doyle 1 , L. B. Fletcher 5 , S. H. Glenzer 5 , D. Kraus 3, 6 , O. L. Landen 1 , H. J. LeFevre 7 , S. R. Klein 8 , P. Neumayer 9 , R. Redmer 3 , M. Schörner 3 , N. Whiting 10 , R. W. Falcone 2 , T. Döppner 1
Affiliation  

X-ray Thomson scattering (XRTS) is a powerful diagnostic technique that involves an x-ray source interacting with a dense plasma sample, resulting in a spectrum of elastically and inelastically scattered x-rays. Depending on the plasma conditions, one can measure a range of parameters from the resulting spectrum, including plasma temperature, electron density, and ionization state. To achieve sensitivity to collective electron oscillations, XRTS measurements require limited momentum transfer where the spectral separation of elastic and inelastic scattering is small. Such measurements require an x-ray probe source with a narrow bandwidth in order to reduce the spectral overlap between scattering contributions, allowing for the different features to be more precisely deconvolved. In this investigation, we discuss the theory behind how the bandwidth for a common XRTS probe, Zn He-α emission at 9 keV, can be reduced using a Cu K-edge filter. Proof-of-principle experiments conducted at the OMEGA laser facility confirm that this is an effective method for attenuating the higher energy He-α peak in the Zn emission spectrum. Calibration measurements at the National Ignition Facility show a reduction in spectral bandwidth from 87 eV to 48 eV when using the Cu filter, which will be important to improve the spectral resolution of future XRTS measurements that will probe plasmon oscillations in strongly compressed plasmas of low-Z materials at densities of tens of g/cm3.

中文翻译:

演示用于集体X射线散射实验的激光驱动的窄光谱带宽X射线源

X射线汤姆森散射(XRTS)是一项强大的诊断技术,涉及X射线源与稠密的血浆样本相互作用,从而产生弹性和非弹性散射的X射线光谱。根据等离子条件,可以从所得光谱中测量一系列参数,包括等离子温度,电子密度和电离状态。为了获得对集体电子振荡的敏感性,XRTS测量需要有限的动量传递,其中弹性和非弹性散射的光谱分离很小。此类测量需要具有窄带宽的X射线探头源,以减少散射贡献之间的光谱重叠,从而可以更精确地对不同特征进行反卷积。在这次调查中可以使用Cu K边缘滤波器降低9 keV时的α发射。在OMEGA激光设备上进行的原理验证实验证实,这是用于衰减Zn发射光谱中较高能量的He- α峰的有效方法。国家点火设施的校准测量结果显示,使用铜滤光片时,光谱带宽从87 eV降低到48 eV,这对于提高未来XRTS测量的光谱分辨率将非常重要,该XRTS测量将探测低压缩等离子体的强压缩等离子体中的等离子体激元振荡Z材料的密度为数十g / cm 3
更新日期:2021-03-31
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