We present measurements of the H-like potassium (K XIX) X-ray spectrum and its He-like (K XVIII) satellite lines, which are situated in the wavelength region between 3.34 and 3.39 Å, which has been of interest for the detection of dark matter. The measurements were taken with a high-resolution X-ray spectrometer from targets irradiated by a long-pulse (2 ns) beam from the Orion laser facility. We obtain experimental wavelength values of dielectronic recombination satellite lines and show that the ratio of the Lyα lines and their dielectronic satellite lines can be used to estimate the electron temperature, which in our case was about 1.5±0.3 keV.
Exploiting the multiple long pulse capability and suite of x-ray diagnostics of the Orion laser, we have set out to explore line coincidence photopuming-the enhancement in population of an atomic level brought on by resonant absorption of x rays from a different emitting ion. Unlike previous work, the two ions are in the same plasma and so the experiment is an x-ray analog of the well-known Bowen resonance fluorescence mechanism that operates in astrophysical situations in the optical region. Our measurements have shown enhanced fluorescence in a chlorine plasma, attributable to line coincident photopumping from co-mixed potassium ions. To detect this relatively low signal-to-noise phenomenon, the data from multiple shots are combined, and the statistical method of bootstrapping is used to assign a confidence value to the measured enhancement, resulting in an estimate of the enhancement of 39 ± 16 18 % compared to the null case, where no pumping occurs. The experimental results have been compared to coupled radiation-transport and radiation hydrodynamics simulations using the CRETIN code together with the NYM radiation hydrodynamics model and agreement has been found, with the simulations also predicting modest enhancement.
Many resonant photo-pumped X-ray laser schemes that use a strong pump line such as Ly-a or He-a to populate the upper laser state of a separate lasing material have been proposed over the last four decades but none have been demonstrated. As a first step to creating a photo-pumped X-ray laser we have decided to reinvestigate some of these schemes at the Orion laser facility with the goal to show enhanced fluorescence. In particular we look at using the Ly-a or He-a K lines to pump the 1s-3p and 4p transitions in H-like Cl and see fluorescence on the 4f-3d line at 65 Å and the 3d-2p line at 23 Å. Preliminary experiments are presented that show a modest enhancement. As an alternative we also look at enhancing the 2p-2s line in Ne-like Ge at 65Å using the Ly-a Mg line to photo-pump the 2s-3p line of Ne-like Ge. Calculations are presented that suggest modest enhancements of 2.5.
Many resonant photo-pumped X-ray laser schemes that use a strong pump line such as Ly-a or He-a to populate the upper laser state of a separate lasing material have been proposed over the last four decades but none have been demonstrated. As a first step to creating a photo-pumped X-ray laser we have decided to reinvestigate some of these schemes at the Orion laser facility with the goal to show enhanced fluorescence. In particular we look at using the Ly-a or He-a K lines to pump the 1s -3p and 4p transitions in H-like Cl and see fluorescence on the 4f -3d line at 65 Å and the 3d -2p line at 23 Å. Preliminary experiments are presented that show a modest enhancement. As an alternative we also look at enhancing the 2p -2s line in Ne-like Ge at 65Å using the Ly-a Mg line to photo-pump the 2s -3p line of Ne-like Ge. Calculations are presented that suggest modest enhancements of 2.5.
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