X-ray scattering from warm dense iron

White, S.; Nersisyan, G.; Dzelzainis, T.; Kettle, B.; McKeever, K.; Lewis, C.L.S.; Riley, David; Siegenthaler, Kenneth; Otten, A.; Kraus, D.; Roth, Markus; White, Thomas G.; Gregori, G.; Gericke, Dirk O.; Wuensch, K.; Vorberger, Jan

doi:10.1016/j.hedp.2013.05.015

Cited by 14 publications

(9 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X-ray Thomson scattering (XRTS) experiments [1][2][3][4][5][6][7][8] yield information on fundamental parameters such as electron and ion density, electron and ion temperature, and ionization state of high-density plasmas. Pump-probe experiments with variable time delay provide insight into the excitation and relaxation dynamics in dense plasmas on ultrashort time scales [4,9].…”

Section: Introductionmentioning

confidence: 99%

Ab initiocalculation of the ion feature in x-ray Thomson scattering

et al. 2015

View full text Add to dashboard Cite

The spectrum of x-ray Thomson scattering is proportional to the dynamic structure factor. An important contribution is the ion feature which describes elastic scattering of x rays off electrons. We apply an ab initio method for the calculation of the form factor of bound electrons, the slope of the screening cloud of free electrons, and the ion-ion structure factor in warm dense beryllium. With the presented method we can calculate the ion feature from first principles. These results will facilitate a better understanding of x-ray scattering in warm dense matter and an accurate measurement of ion temperatures which would allow determining nonequilibrium conditions, e.g., along shock propagation.

show abstract

Section: Introductionmentioning

confidence: 99%

Ab initiocalculation of the ion feature in x-ray Thomson scattering

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The measurements described here were obtained by XRTS of ∼9 keV monoenergetic x-rays at a scattering angle of 84 • in the non-collective scattering regime [11]. This method is a unique tool to assess the basic properties of the plasma as the scattering spectrum is directly related to the velocity distribution of the free electrons [20][21][22], the plasma composition and spatial correlations between the ions [23][24][25][26][27][28]. Here, we demonstrate the high sensitivity of XRTS to probe inner-shell ionization in highly compressed matter with high accuracy in the extreme environments of implosions driven by the NIF laser.…”

mentioning

confidence: 99%

X-ray scattering measurements on imploding CH spheres at the National Ignition Facility

et al. 2016

Self Cite

View full text Add to dashboard Cite

We have performed spectrally resolved x-ray scattering measurements on highly compressed polystyrene at pressures of several tens of TPa (100 Mbar) created by spherically convergent shocks at the National Ignition Facility. Scattering data of line radiation at 9.0 keV were recorded from the dense plasma shortly after shock coalescence. Accounting for spatial gradients, opacity effects, and source broadening, we demonstrate the sensitivity of the elastic scattering component to carbon K-shell ionization while at the same time constraining the temperature of the dense plasma. For six times compressed polystyrene, we find an average temperature of 86 eV and carbon ionization state of 4.9, indicating that widely used ionization models need revision in order to be suitable for the extreme states of matter tested in our experiment.

show abstract

“…Such extreme states of matter can be generated by irradiating targets with short wavelength, ultra‐short laser radiation generated by free electron laser facilities such as FLASH Hamburg, the European X‐ray Free Electron Laser (XFEL) in Schenefeld, or the LCLS Stanford. The record peak brightness of FEL pulses combined with a narrow bandwidth enable the development of novel diagnostic tools such as XRTS for the study of WHDM, astrophysical plasmas, ICF plasmas, and shock‐wave experiments …”

Section: Introductionmentioning

confidence: 99%

Ionization dynamics of dense matter generated by intense ultrashort X‐ray pulses

Shihab

Bornath

Redmer

2019

Contributions to Plasma Physics

View full text Add to dashboard Cite

We investigate a pump‐probe X‐ray Thomson scattering (XRTS) experiment that might be carried out at a free electron laser facility to study warm‐to‐hot states of dense matter. Ultrashort and intense X‐ray pulses with different energies (1,560–1,830 eV) heat a 1 µm thick Al target isochorically and create homogeneous and uncompressed warm‐to‐hot states of dense matter. A second pulse with variable delay probes this heated state via XRTS. The X‐ray laser–target interaction is modelled within radiation‐hydrodynamic simulations applying the HELIOS‐CR code. The HELIOS‐CR results qualitatively agree with Monte‐Carlo simulations, where the laser pulse absorption is simulated based on a uniform random sequence of events. The electron feature in the simultaneously observed X‐ray scattering spectrum is a function of the degree of ionization and the target temperature. Therefore, the temporal evolution of the plasmon peak measures the ionization dynamics on ultra‐short time scales. The XRTS spectrum is calculated based on the Chihara formula utilizing the Born‐Mermin approximation for the free electron dynamic structure factor. The proposed experiment will reveal important details of the ionization dynamics on ultra‐short time scales as well as of the relaxation on ps time scales.

show abstract

X-ray scattering from warm dense iron

Cited by 14 publications

References 25 publications

Ab initiocalculation of the ion feature in x-ray Thomson scattering

Ab initiocalculation of the ion feature in x-ray Thomson scattering

X-ray scattering measurements on imploding CH spheres at the National Ignition Facility

Ionization dynamics of dense matter generated by intense ultrashort X‐ray pulses

Contact Info

Product

Resources

About