Overview of the proposed Fusion Test Facility (FTF).
Optical block diagram of the FTF laser architecture for one of the 20 identical systems, each having a total energy up to in 90 single pulse beams with pulses separated by .
Double-pass laser amplifier, showing how the broad angular divergence of the ASE allows it to infiltrate all of the beam channels.
Description and long-pulse performance of the proposed final amplifier module design. Upper left: top view of the laser cell, including the e-beam pump configuration. Four sets of opposing e-beams are injected by two cathode pairs on each side with an axial separation of . Upper right: the cathodes in each pair are wide by high and separated by to allow support for the hibachi frames. Lower left: predicted temporal history of the e-beam and intensities of the input , output , and ASE . Lower right: axial profile snapshots (at ) of the e-beams, ASE, internal intensities , and effective saturation intensity .
Driver input pulses required to produce the shock ignition pulses at the final amplifier output: (a) First target beam (blue), front end of the buffer beam (black), and total input intensity of all beams (light grey); (b) input pulse with a magnified time scale; (c) comparison of the final amplifier output pulse in the reference beam to the (shifted) ideal shock ignition pulse.
[(a) and (b)] Simulated parameters at the final amplifier, showing selected output beams , , (blue), buffer beam (black), total output intensity of all beams (light gray), total ASE output (green), and e-beam specific power deposition (red); (c) , , , and with magnified time scales.
Total instantaneous power in all 90 beams (blue) and fractional beam-to-beam rms deviation (red) of the shock ignition pulse.
Total on-target intensities (solid lines) and fluences (dashed lines) of the shock ignition pulse (blue) and ASE (green) from all 20 laser systems. The origin of the time scale is placed at the beginning of the picket pulse.
Configuration of the proposed Kerr gate that uses an intense coherent pulse to impose the desired predistorted envelope shape on a cw ISI beam via polarization rotation.
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