Theoretical Band Structure Analysis on Possible High-Z Detector Materials

Theoretical energy band structure calculations have been utilized to investigate several high-Z materials for potential use as ambient temperature radiation detectors. Using the pseudopotential technique, the band structure for HgI$sub 2$ has been determined and the effective masses of the holes and electrons have been estimated. Theoretical mobilities of the electrons and holes as a function of temperature have been computed for HgI$sub 2$ and CdTe and are compared to experimental data. (auth

Fabrication of glass sphere laser fusion targets

We have developed processes at LLL for mass producing the high quality glass microspheres required for current laser fusion targets. Here we describe the methods and the materials used in our liquid-droplet and dried-gel systems. Glass microspheres ranging from 70 to 600 microns O.D., with walls from 0.5 to 18 microns thick and which satisfy the exacting surface and symmetry specifications of targets for high density experiments are now produced routinely

Feasibility study for analyzing plasma-aerodynamic effects

The purpose of this feasibility study was to conduct preliminary modeling to elucidate the mechanisms responsible for the effects observed in the Air Force Research Laboratory (AFRL) shock tube experiment. It was assumed that the plasma is simply a region of gas in the shock tube that has a higher gas temperature. Computational fluid dynamics (CFD) calculations were performed to simulate the propagation of a shock wave through the tube, using the same parameters in the experiment. Both 1- D and 3-D CFD calculations were performed to determine which effects can be explained simply by axial temperature gradients and which effects require the presence of radial temperature gradients. Discharge plasma physics calculations of a longitudinal glow discharge were then used to establish if the electrical currents used in the experiment are consistent with the gas temperature distributions that are necessary to explain the observed effects

Parametric study of a target factory for laser fusion

An analysis of a target factory leading to the derivation of production rate equations has provided the basis for a parametric study. Rate equations describing the production of laser fusion targets have been developed for the purpose of identifying key parameters, attractive production techniques and cost scaling relationships for a commercial target factory

r BECEIVEQ BY TIC OCT 14 197^ PREPRINT UCRL-76693 Lawrence Uvermore Laboratory ADVANCED INSTRUMENTATION FOR NUCLEAR MONITORING EHSE^LS Advanced instrumentation for Nuclear Monitorin

ABSTRACT Research on semiconductor radiation detectors is described. We developed computational models to calculate the energy band structure, carrier mobility, and carrier lifetime of proposed detector materials, and a computer spectrum simulation that accurately predicts the potential performance of the materials as detectors. We also report on a self contained, field-portable spectrometer for laboratory-grade pulse-height analysis of gamma-ray spectra suitable for use under extreme environmental conditions and isolated locations by personnel not trained in electronics

Design of the Target Fabrication Tritium Laboratory

The design of the Target Fabrication Tritium Laboratory for deuterium-tritium fuel processing for laser fusion targets has been accomplished with the intent of providing redundant safeguard systems. The design of the tritium laboratory is based on a combination of tritium handling techniques that are currently used by experienced laboratories. A description of the laboratory in terms of its interrelated processing systems is presented to provide an understanding of the design features for safe operation