Thin wall hohlraum HXRI images showing progression of coronal emission from back wall to LEH for a radius hohlraum irradiated with in . (a) Schematic of halfraum showing laser entering from bottom left. (b) Image of hohlraum at showing coronal plasma emission from laser-driven plasma at back wall. (c) Image at showing that the laser energy deposition is distributed between the back wall and the LEH. (d) Image at showing that most of the laser energy deposition has migrated to the LEH. The images are negative where dark indicates more signal.
Functional diagram and outline drawing of FFLEX.
-edge cutoff for Pb prefilter transmission—Photon transmission fraction through filter vs photon energy (keV), Au fluorescer sensitivity—MeV∕collision vs photon energy (keV), Au postfilter—Photon transmission fraction through filter vs photon energy (keV) and overall channel response for channel 7 photon energy (keV).
FFLEX data showing hard x rays for several representative hohlraums. Data key is hohlraum radius in millimeters, laser energy (kilojoule), laser pulse length (nanoseconds). The line of sight to the FFLEX and the laser light entering the bottom of the halfraum are shown in the inset overlaid on the plot.
Fraction of laser energy detected as hot electrons plotted vs laser intensity in (data) and power law fit to the data (line); see the text.
Fraction of laser energy detected as hot electrons plotted vs normalized time to reach for cold fill model based on pressure balance. The shape of the data point is indicative of the hohlraum radius; square , circle , diamond , and triangle .
Parameters of the performed experiments.
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