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Time-resolved characterization of Hohlraum radiation temperature via interferometer measurement of quartz shock velocity
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color) The Omega halfraum experimental arrangement and a typical streaked image of the interferometer fringe pattern. Shock breakout at the Al/vacuum interface is in upper half of the streak. Shock breakout at the Al/quartz interface followed by reflection from the shock front within the quartz is in the lower half of the streak.

Image of FIG. 2.
FIG. 2.

(Color) Velocity-time unfolds of dual interferometer fringe patterns with two different velocity per fringe optical delay settings.

Image of FIG. 3.
FIG. 3.

(Color) (a) The upper image is an interferometer streak in which the transit times for shock propagation across the aluminum step and the quartz sample are clearly discernible. (b) The lower image is a SOP streak (of the same experiment) in which the shock thermal luminescence can be used to verify the shock transit times. In both images, the time fiducials are at intervals.

Image of FIG. 4.
FIG. 4.

(Color) (a) Dante temperature history unfolds for experiments with Hohlraum temperatures covering the range of . (b) Interferometer measurements of the quartz shock velocities for these same experiments.

Image of FIG. 5.
FIG. 5.

(Color) (a) The empirical scaling has been applied to the velocity-time plots shown in Fig. 4(b) and then overlaid on the Dante plots of Fig. 4(a). The time shift correction has been applied to the velocity interferometer-determined temperatures and then overlaid on the Dante plots. The additional plot covering the midrange temperatures is from an experiment in which only the quartz component was used (i.e., no aluminum step).

Image of FIG. 6.
FIG. 6.

(Color) As the Hohlraum temperature is increased (via increasing the laser input power and intensity), the problem of preheat ahead of the shock increases. This results in a loss of optical transparency in the quartz and, hence, a “blanking” of the data in the interferometer streaked image. Interestingly, it appears that the optical transparency of the quartz recovers after the end of the laser pulse (especially in the upper image).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-resolved characterization of Hohlraum radiation temperature via interferometer measurement of quartz shock velocity