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It is known that small scale beam instabilities limit the focusable energy that can be achieved from a terawatt laser chain. Spatial filters are currently being used on CYCLOPS to ameliorate this problem. Realizing the full advantage of such a filter, however, may require certain staging modifications. A staging methodology is discussed that should be applicable to the CYCLOPS, 381, and SHIVA systems. Experiments are in progress on CYCLOPS that will address directly the utility of the proposed approach.

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Thesis. Lithium fluoride crystals, with TlF added to the charge, were prepared by the Bridgman- Stockbarger method. The scintillation response to photon energies between 25 and 1250 keV for these crystals and a commercially prepared LiF (Ti) crystal was studied. The response of the LiF (Ti) crystal was compared to the response of an NE109 scintillator at 1250 keV. The dose response of the LiF (Ti) crystal was evaluated over the energy range 25 to 1250 keV. The absorption and emission spectra of the LiF (Ti) crystal are discussed. A historical review precedes the discussion. (auth)

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A conceptual design study of 200-GeV proton intersecting storage accclerators with room temperature magnets is presented. The key to this study was thc desire to keep the electric power consumptiom to an acceptable level (40 MW). The design has been optimized by choosing small-gap (4 cm) aluminum coil dipoles operating at about 15 kG. The luminosity of this machine is limited to about 10/sup 32/ cm-/sup -2/ sec/sup -1/ by transverse space-charg e effects. An order of magnitude higher luminositics can be obtained by adding a booster of modest cost. A novel vacuum system using distributed Ti-sublimation pumps results in considerable savings. A cost comparison with a high-luminosity superconducting machine is given. (auth)

An ion microprobe mass analyzer was used to investigate the reaction pathway for the formation of lithium hydroxide and lithium oxide on freshly cleaved lithium deuteride surfaces. Mass spectra were obtained from the lithium deuteride surfaces before and after exposure to room air, and the composition of the corrosion film was determined by depth-profiling methods. The corrosion film appears to be layered in the following manner: lithium hydroxide on lithium oxide on lithium deuteride. (auth)

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An experimental study has shown that the variations in pressure typically experienced in an electron-beam welding chamber can significantly affect the focus of the electron beam, resulting in detectable variations in weld penetration and width. (auth)

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S>Knowledge of the deposition of energy with distance around an underground nuclear explosion has significance in predicting chemical processes in the multimineralic rock substance surrounding the explosion. When a nuclear explosion is detonated, the shock wave that emanates from the explosion center does PdV work on the rock substance and deposits energy. Energy deposition due to the passage of the shock wave is determined from hydrodynamic code calculations which keep track of internal energy with distance and time. The energy distribution with distance depends on the compressibility of the rock. Rock of low density and high porosity requires a larger increase in internal energy to shock it to a given pressure than an essentially pore-free dense rock. Interpretation of hydrodynamic code calculations shows that 1000 to 1200 metric tons/kt of melt is produced from dense granite and that two to three times as much melt is produced from dry porous ash-fall tuff. Radiochemical analysis of melt samples recovered from near the shot point tend to confirm these results. (auth)

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