30 research outputs found
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Debris collection from implosion of microballoons
Recovery of krypton from implosion of glass microballoons has been studied in the development of a radiochemical diagnostic for determination of /sub fuel/. Collection onto metal surfaces following implosions performed on the OMEGA laser with 1-3 TW (1-2 kJ) of 0.35 ..mu..m light is consistent with an ion implantation mechanism. The dependence of the intrinsic collection efficiency on the energy fluence to the collector surface and its variation in implosions carried out under the same nominal conditions indicate ion energies extending to at least 0.1 MeV and energy distribution functions that are sensitive to the details of the implosion dynamics. Intrinsic sticking efficiencies approaching 0.5 can be obtained in the limit of low total energy fluence to the collector surface (less than or equal to 0.1 J cm/sup -2/)
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Recent implosion experiments at Nova
Both electron (direct) and x-ray (indirect) driven implosions of DT targets have been done using approx.20 kJ of 0.35 ..mu..m light from the ten beam Nova laser facility. The direct drive targets (glass microballoons with nominal dimensions of 1000 ..mu..m x 2 ..mu..m and DT pressures of 12 to 14 atm) produced neutron yields in excess of 10/sup 13/ and fusion efficiencies >0.15%. Recent experiments will be described, with particular emphasis on measurements made using neutron diagnostics
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Calculation of the energy-dependent efficiency of gridded /sup 3/He fast-neutron ionization chambers
Research and development activities under this contract proceeded along several lines, including development of a gas jet facility for the transport and isolation of fission product activities with half lives in the range T/sub 1/2/ less than or equal to 2 sec, studies on the factors affecting the energy and timing resolution of gridded /sup 3/He ionization detectors for delayed neutron spectroscopy and the development of simple models for calculation of the beta-decay characteristics of short-lived fission products near A = 90. Brief outlines of the activities in the areas are given. (WHK
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