Demonstration of space-resolved x-ray Thomson scattering capability for warm dense matter experiments on the Z accelerator

详细信息    查看全文

• 作者：T. Ao ; ^{tao@sandia.gov" class="auth_mail" title="E-mail the corresponding author} ; ^{tao137@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; E.C. Harding ; J.E. Bailey ; R.W. Lemke ; M.P. Desjarlais ; S.B. Hansen ; I.C. Smith ; M. Geissel ; A. Maurer ; J. Reneker ; D. Romero ; D.B. Sinars ; G.A. Rochau ; J.F. Benage
• 关键词：Warm dense matter ; X-ray Thomson scattering ; High-velocity impact ; Shock wave ; Pulsed-power
• 刊名：High Energy Density Physics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：18
• 期：Complete
• 页码：26-37
• 全文大小：3633 K

文摘

Experiments on the Sandia Z pulsed-power accelerator have demonstrated the ability to produce warm dense matter (WDM) states with unprecedented uniformity, duration, and size, which are ideal for investigations of fundamental WDM properties. For the first time, space-resolved x-ray Thomson scattering (XRTS) spectra from shocked carbon foams were recorded on Z. The large (>20 MA) electrical current produced by Z was used to launch Al flyer plates up to 25 km/s. The impact of the flyer plate on a CH₂ foam target produced a shocked state with an estimated pressure of 0.75 Mbar, density of 0.52 g/cm³, and temperature of 4.3 eV. Both unshocked and shocked portions of the foam target were probed with 6.2 keV x-rays produced by focusing the Z-Beamlet laser onto a nearby Mn foil. The data are composed of three spatially distinct spectra that were simultaneously captured with a single spectrometer with high spectral (4.8 eV) and spatial (190 µm) resolutions. Detailed spectral information from three target locations is provided simultaneously: the incident x-ray source, the scattered signal from unshocked foam, and the scattered signal from shocked foam.