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K-shell emission trends from 60 to 130 cm/μs stainless steel implosions
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Variation of Fe Ly-α to Fe He-α ratio (blue) and K-shell power (green) in temperature-density space. Note that the density values shown are densities of Fe ions—the ion density of stainless steel including all species is 40% higher. (b) Variation of the line ratio with temperature for Fe ion densities <3 × 1020 cm−3, where the ratio is independent of density.

Image of FIG. 2.
FIG. 2.

(a) Total radiation pulses for an experiment with a 65 mm, 2.5 mg nested array. A split y-axis scale is used to show the interaction pulse and main pulse, which are identified by vertical lines. (b) Average velocities inferred from the relative timing of the interaction and main radiation pulses for a number of experiments at different masses and all three diameters, compared to center of mass implosions velocity estimates from simulations.

Image of FIG. 3.
FIG. 3.

(a) Total radiation pulses for an MHD simulation of a 70 mm wire array. (b) Center-of-mass velocity from the simulation, along with the average velocity inferred from analyzing the simulated radiation pulse by the same method used in Figure 2 .

Image of FIG. 4.
FIG. 4.

Radiated K-shell and total power pulses for different array configurations. At each of three different initial diameters, multiple masses were fielded, leading to varying implosion times. On each plot, all different masses used at a given diameter are shown. Uncertainties in the K-shell powers are ∼15% and in total powers are ∼10%.

Image of FIG. 5.
FIG. 5.

Variation of the experimental total (blue) and K-shell yields (red) for different implosion velocities (inferred from experiments). Fits to the trend in each plot are shown.

Image of FIG. 6.
FIG. 6.

Spectra for 5 different shots. The major emission lines are identified. The Fe Ly-α and He-α lines provide a temperature diagnostic. The data are shown on a linear scale (left) and logarithmic scale (right).

Image of FIG. 7.
FIG. 7.

(a) Variation of temperature with implosion velocity. (b) Fraction of total emission radiated in K-shell as a function of inferred temperature (from line ratios) for different masses at 65 mm, 70 mm, and 75 mm initial diameters. In (a), only those shots with a clean interaction pulse are shown. Fits to the trend in each plot are shown.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: K-shell emission trends from 60 to 130 cm/μs stainless steel implosions