OMEGA, a 60-beam, 351 nm, Nd:glass laser with an on-target energy capability of more than 40 kJ, is a flexible facility that can be used for both direct- and indirect-drive targets and is designed to ultimately achieve irradiation uniformity of 1% on direct-drive capsules with shaped laser pulses (dynamic range ≳400:1). The OMEGA program for the next five years includes plasma physics experiments to investigate laser–matter interaction physics at temperatures, densities, and scale lengths approaching those of direct-drive capsules designed for the 1.8 MJ National Ignition Facility (NIF); experiments to characterize and mitigate the deleterious effects of hydrodynamic instabilities; and implosion experiments with capsules that are hydrodynamically equivalent to high-gain, direct-drive capsules. Details are presented of the OMEGA direct-drive experimental program and initial data from direct-drive implosion experiments that have achieved the highest thermonuclear yield (1014 DT neutrons) and yield efficiency (1% of scientific breakeven) ever attained in laser-fusion experiments.
The dual-tripler scheme for enhancing the bandwidth of third-harmonic generation proposed by Eimerl et al. [Opt. Lett. 22, 1208 (1997)] is experimentally demonstrated for the conversion of 1054-nm radiation to 351 nm. It is shown that the spacing between the triplers must be carefully controlled. The results are in excellent agreement with theory and indicate that fusion lasers can be frequency tripled with a threefold increase in bandwidth.
I1 has teen shown that insulating LiH and LiD transform gradually to a semiconducting state at about 30 GPa and room temperature. It was +so found that these compounds undergo a semiconductoi-to-semmeral transition at about 43 GPa The akserved phenomena can probably @explained by a first-order phase B1-to-B2 structure transition.
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