Progress toward x-ray Thomson scattering of warm dense matter on the Z accelerator

18th APS-SCCM; 24th AIRAPT

Ao, T.^1 ; Harding, E.C.^1 ; Bailey, J.E.^1 ; Desjarlais, M.P.^1 ; Hansen, S.B.^1 ; Lemke, R.W.^1 ; Rochau, G.A.^1 ; Sinars, D.B.^1 ; Smith, I.C.^1 ; Geissel, M.^1 ; Reneker, J.^1 ; Kernaghan, M.D.^1 ; Mix, L.P.^1 ; Wenger, D.F.^1

Sandia National Laboratories, Albuquerque

NM

87185, United States^1

关键词: High sensitivity;    Large current;    Warm dense matters;    X ray Thomson scattering;    X-ray background;    X-ray sources;    Z accelerator;    Z-beamlet laser;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/8/082001/pdf
DOI  :  10.1088/1742-6596/500/8/082001

来源: IOP

【 摘 要 】

Experiments on the Z accelerator have demonstrated the ability to produce warm dense matter (WDM) states with unprecedented uniformity, duration, and size. Significant progress to combine x-ray Thomson scattering (XRTS), a powerful diagnostic for WDM, with the unique environments created at Z has been accomplished. The large current of Z is used to magnetically launch Al flyers to impact CH2foam (0.12 g/cm3) samples. The uniformly-shocked CH2foam volume is about 10 mm3and the steady shock state lasts up to about 100 ns, which are approximately 1000 & 100 times larger, respectively, than typical laser shocked samples. The Z-Beamlet laser irradiates a 5 μm thick Mn foil near the load to generate 6.181 keV Mn-He-α x-rays that penetrate into the CH2foam and scatter from it. A high sensitivity x-ray scattering spherical spectrometer with both high spatial and spectral resolution is fielded, which enables benchmark quality data by simultaneously measuring x-rays scattered from shocked and ambient regions of the CH2foam, and the Mn x-ray source. Experimental efforts have achieved low x-ray background and mitigation of load debris, and measured high quality XRTS data of ambient CH2foam have validated the technique.