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Two diagnostics have been developed to improve the uniformity on the OMEGA Laser System, which is used for
inertial confinement fusion (ICF) research. The first diagnostic measures the phase of an optical modulator (used for
the spectral dispersion technique employed on OMEGA to enhance spatial smoothing), which adds bandwidth to the
optical pulse. Setting this phase precisely is required to reduce pointing errors. The second diagnostic ensures that the
arrival times of all the beams are synchronized. The arrival of each of the 60 OMEGA beams is measured by placing a
1-mm diffusing sphere at target chamber center. By comparing the arrival time of each beam with respect to a reference
pulse, the measured timing spread of the OMEGA Laser System is now 3.8 ps.
W. R. Donaldson,J. Katz,T. Z. Kosc,J. H. Kelly,E. M. Hill, andR. E. Bahr
"Enhancements to the timing of the OMEGA laser system to improve illumination uniformity", Proc. SPIE 9966, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion V, 996607 (19 September 2016); https://doi.org/10.1117/12.2237053
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W. R. Donaldson, J. Katz, T. Z. Kosc, J. H. Kelly, E. M. Hill, R. E. Bahr, "Enhancements to the timing of the OMEGA laser system to improve illumination uniformity," Proc. SPIE 9966, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion V, 996607 (19 September 2016); https://doi.org/10.1117/12.2237053