Absorption spectroscopy of Al XIII Ly-α radiation by an Fe XXIV plasma

Gouveia, Alexandra; Al’Miev, I. R.; Hawreliak, J.; Chambers, D. M.; Liang, Tianjiao; Marjoribanks, R. S.; Pinto, Philip A.; Renner, O.; Zhang, J.; Wark, J. S.

doi:10.1016/s0022-4073(03)00072-4

Cited by 3 publications

(3 citation statements)

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“…separate plasmas. The advantage of the scheme considered in this work over the others hitherto reported upon [6][7][8][9][10][11] is the possibility of creating a mixed plasma at the correct temperature and density for both K and Cl. This allows us to neglect the differential Doppler shift that could otherwise take the lines out of coincidence, removing a large source of uncertainty from the calculations.…”

Section: Fig 3 Contour Plot Showing Cretin Calculated Increases In mentioning

confidence: 98%

“…Achieving lasing at x-ray wavelengths in a plasma amplifier using LCP still remains elusive, with the shortest wavelength at which gain has been observed being a Be-like C line at 2163 Å [5]. However, there has been some success in the demonstration of enhanced fluorescence attributable to line coincidence photopumping, where x rays produced by line radiation have been used to directly pump a resonant transition in physically separate laser produced plasmas [6][7][8][9][10]. In particular, Back et al conducted experiments and radiation transfer calculations utilizing an aluminum He α pump, noting the advantages of this line in creating a large population over a wider temperature range than is possible for Ly α emission [7,8].…”

Section: Introductionmentioning

confidence: 99%

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X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma

et al. 2020

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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.

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Section: Fig 3 Contour Plot Showing Cretin Calculated Increases In mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma

et al. 2020

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“…There have also been two experiments in which there is some evidence that line-coincidence photopumping involving two different species has resulted in enhanced fluorescence. The first is that of a 3d-2p transition in Belike Mn line pumping the Ly-b line in H-like F [22] and the second involved the Ly-a line of Al pumping the 1s 2 2s-1s 2 5p line in Li-like Fe [14]. In addition to experiments in the laboratory, there is considerable evidence that line-coincidence photopuming produces lasing action in vicinity of the star h-Car [16,17]).…”

Section: Narrow-band Photopumpingmentioning

confidence: 99%