Section 2 PROGRESS IN LASER FUSION
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چکیده
LLE is presently involved in a series of experiments 'intended to demonstrate the ability of direct-drive laser fusion to ablatively compress microencapsulated deuterium-tritium (DT) fuel to 200 times its liquid density. This campaign has been structured into three parts. The first part was initiated in February 1985 and involved the implosion of glass microballoons filled with various pressures of DT gas. Compression of these initial targets attained maximum fuel densities of 6.0 to 6.5 glcm3, or -30 times liquid DT density (30 XLD) and maximum neutron yields in the range of 1.5 to 2.0 x 10ll. The experiments also served to test recently added diagnostics on the OMEGA system which will be necessary to evaluate the final 200-XLD targets. These diagnostics include knock-on fuel ion spectrometry for measuring fuel areal density (),I radiation chemistry techniques (RAD-CHEM) for measuring shell areal densities (),2 neutron time-of-flight equipment for determining core temperatures,3 and Kirkpatrick-Baez (K-8) microscopes, which give spatially resolved x-ray emission information from the imploding shell.4
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Parametric instabilities of importance to laser-plasma interactions in laserfusion experiments are usually analyzed assuming only one laser beam (pump) drives each instability. In actual experiments, however, multiple laser beams may overlap in a localized region of the fusion target corona, where parametric instabillties may be driven by more than one pump. In the simplest case, shown in Fig. ...
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