Army Joint Coordination - Memorandum: GAO Submission - 050114 - 14 Jan 05

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Army Joint Coordination - Memorandum: GAO Submission - 050211 - 11 Feb 05

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DISREGARD RESTRICTION HEADER AND FOOTER - Army Joint Coordination - NORTHCOM RC PAT BRIEFING (050223)

Army Joint Coordination Reserve Component Process Action Team Charter 28 July 03

BRAC Early Bird 16 September 2005

Ultraviolet Thomson scattering has been fielded at the Omega Laser Facility to achieve accurate measurements of the plasma conditions in laser-produced high-temperature plasmas. Recent applications to hohlraum targets that have been filled with CH gas or SiO{sub 2} foams have demonstrated a new high temperature plasma regime of importance to laser-plasma interaction studies in a strongly damped regime such as those occurring in indirect drive inertial confinement fusion experiments. The Thomson scattering spectra show the collective ion acoustic features that fit the theory for two ion species plasmas and from which we infer the electron and ion temperature. We find that the electron temperature scales from 2-4 keV when increasing the heater beam energy into the hohlraum from 8-17 kJ, respectively. Simultaneous measurements of the stimulated Raman scattering from a green 527 nm interaction beam show that the reflectivity decreases from 20% to 1% indicating that this instability is strongly damped at high temperatures. These findings support green laser beams as possible driver option for laser-driven fusion experiments.

Flow in metallic glasses is associated with stress-induced cooperative rearrangements of small groups of atoms involving the surrounding free volume. Understanding the details of these rearrangements therefore requires knowledge of the amount and distribution of the free volume and how that distribution evolves with deformation. The present study employs positron annihilation spectroscopy to investigate the free volume change in Zr{sub 58.5}Cu{sub 15.6}Ni{sub 12.8}Al{sub 10.3}Nb{sub 2.8} bulk metallic glass after inhomogeneous plastic deformation by cold rolling and structural relaxation by annealing. Results indicate that the size distribution of open volume sites is at least bimodal. The size and concentration of the larger group, identified as flow defects, changes with processing. Following initial plastic deformation the size of the flow defects increases, consistent with the free volume theory for flow. Following more extensive deformation, however, the size distribution of the positron traps shifts, with much larger open volume sites forming at the expense of the flow defects. This suggests that a critical strain is required for flow defects to coalesce and form more stable nanovoids, which have been observed elsewhere by high resolution TEM. Although these results suggest the presence of three distinct open volume size groups, further analysis indicates that all …

DASA(IA) Memo - 040225 - Tech JCSG MV Analysis Report

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DASA(IA) Memo - 040302 - E&T JCSG MV Analysis Report

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DASA(IA) memo - 041109 - Replacement JCSG Member for E&T

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DISREGARD RESTRICTION HEADER AND FOOTER - DASA(IA) memo - 050120 - AAP Cobra Runs (to Sr Army Rep to IND JCSG)