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an absolutely calibrated [19] 18-channel soft x-ray power diagnostic ("Dante") [20] at 0 = 1610,
= 326.5 , an absolutely calibrated time-integrating 8-channel hard x-ray calorimeter [21] at 0 =
900, = 1100, a 1D imaging x-ray streak camera (SXD) and a gated single or multiple frame
hard x-ray (FXI-HXRI) [22] and soft x-ray (FXI-MSXRI) 2D imager insertable in the other DIM
located at 0 = 900, = 3150.
The experiments were undertaken with 3w laser powers and energies of up to 8 TW and 17 kJ in
flattop and shaped 1- 9 ns pulses focused with various beam smoothing options (Continuous
Phase-plates (CPP), Polarization smoothing (PS) and Smoothing by Spectral Dispersion (SSD).
CPPs installed in either near the front end or end of the lo amplification section of the laser
provided super-Gaussian spots of either 0.25, 0.5 or 0.7 mm spot size [23]. PS provided by a
wedged birefringent KDP crystal [24] separated orthogonal polarizations by 20 pm (more than a
speckle size), reducing the average speckle intensity by 1.6x. SSD provided up to 90 GHz
bandwidth at a 17 Ghz modulation frequency. The 3w laser energies and powers were measured
with 2% and 3%/ns accuracy by calorimeters, diodes and for at least 1 beam, an optical streak
camera.
For the framing and streak cameras, the data recording medium was a custom-designed 4k by 4k
9 pm-pixel CCD [25], while the SXI used a back-thinned x-ray sensitive 23 pm pixel 2k by 2k
chip. The beam synchronization was set to 6 ps rms by comparing the timing of streaked 2 keV
ID images [26] of four separate 200 ps laser-plasmas created by the four beams impinging on a
gold disk. The pointing accuracy for the pulsed beams was verified to be better than 75 pm rms5
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Landen, O. L.; Glenzer, S.; Froula, D.; Dewald, E.; Suter, L. J.; Schneider, M. et al. The First Experiments on the National Ignition Facility, article, November 11, 2005; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc885075/m1/7/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.