XFEL resonant photo-pumping of dense plasmas and dynamic evolution of autoionizing core hole states

F. B. Rosmej, A. Moinard, O. Renner, E. Galtier, J. J. Lee, B. Nagler, P. A. Heimann, W. Schlotter, J. J. Turner, R. W. Lee, M. Makita, D. Riley, J. Seely

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Abstract

Similarly to the case of LIF (Laser-Induced Fluorescence), an equally revolutionary impact to science is expected from resonant X-ray photo-pumping. It will particularly contribute to a progress in high energy density science: pumped core hole states create X-ray transitions that can escape dense matter on a 10 fs-time scale without essential photoabsorption, thus providing a unique possibility to study matter under extreme conditions. In the first proof of principle experiment at the X-ray Free Electron Laser LCLS at SCLAC [Seely, J., Rosmej, F.B., Shepherd, R., Riley, D., Lee, R.W. Proposal to Perform the 1st High Energy Density Plasma Spectroscopic Pump/Probe Experiment", approved LCLS proposal L332 (2010)] we have successfully pumped inner-shell X-ray transitions in dense plasmas. The plasma was generated with a YAG laser irradiating solid Al and Mg targets attached to a rotating cylinder. In parallel to the optical laser beam, the XFEL was focused into the plasma plume at different delay times and pump energies. Pumped X-ray transitions have been observed with a spherically bent crystal spectrometer coupled to a Princeton CCD. By using this experimental configuration, we have simultaneously achieved extremely high spectral (λ/δλ ≈ 5000) and spatial resolution (δx≈70 μm) while maintaining high luminosity and a large spectral range covered (6.90 - 8.35 Å). By precisely measuring the variations in spectra emitted from plasma under action of XFEL radiation, we have successfully demonstrated transient X- ray pumping in a dense plasma.

Original languageEnglish
Article number012093
Number of pages4
JournalJournal of Physics: Conference Series
Volume688
Issue number1
DOIs
Publication statusPublished - Mar 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Rosmej, F. B., Moinard, A., Renner, O., Galtier, E., Lee, J. J., Nagler, B., Heimann, P. A., Schlotter, W., Turner, J. J., Lee, R. W., Makita, M., Riley, D., & Seely, J. (2016). XFEL resonant photo-pumping of dense plasmas and dynamic evolution of autoionizing core hole states. Journal of Physics: Conference Series, 688(1), [012093]. https://doi.org/10.1088/1742-6596/688/1/012093