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The GLAST Large Area Telescope Detector Performance Monitoring

Description: The Large Area Telescope (LAT) is one of two instruments on board the Gamma-ray Large Area Telescope (GLAST), the next generation high energy gamma-ray space telescope. The LAT contains sixteen identical towers in a four-by-four grid. Each tower contains a silicon-strip tracker and a CsI calorimeter that together will give the incident direction and energy of the pair-converting photon in the energy range 20 MeV - 300 GeV. In addition, the instrument is covered by a finely segmented Anti-Coinci… more
Date: October 16, 2007
Creator: Borgland, A. W. & Charles, E.
Partner: UNT Libraries Government Documents Department
open access

The GLAST LAT Instrument Science Operations Center

Description: The Gamma-ray Large Area Space Telescope (GLAST) is scheduled for launch in late 2007. Operations support and science data processing for the Large Area Telescope (LAT) instrument on GLAST will be provided by the LAT Instrument Science Operations Center (ISOC) at the Stanford Linear Accelerator Center (SLAC). The ISOC supports GLAST mission operations in conjunction with other GLAST mission ground system elements and supports the research activities of the LAT scientific collaboration. The ISOC… more
Date: October 16, 2007
Creator: Cameron, Robert A.
Partner: UNT Libraries Government Documents Department
open access

R-invariant New Inflation Model vs Supersymetric Standard Model

Description: We revisit the implications of the R-invariant New Inflation model to the supersymmetric standard model in light of recent discussion of gravitino production processes by the decay of the inflaton or the supersymmetry breaking field. We show that the models with supergravity mediation do not go well with the R-invariant New Inflation model, where the gravitino abundance produced by the decay of the inflaton or the supersymmetry breaking field significantly exceeds the bounds from cosmological o… more
Date: October 16, 2007
Creator: Ibe, Masahiro & Shinbara, Y.
Partner: UNT Libraries Government Documents Department
open access

Applications of Parallel Computational Methods to Charged-Particle Beam Dynamics

Description: The availability of parallel computation hardware and the advent of standardized programming interfaces has made a new class of beam dynamics problems accessible to numerical simulations. We describe recent progress in code development for simulations of coherent synchrotron radiation and the weak-strong and strong-strong beam-beam interaction. Parallelization schemes will be discussed, and typical results will be presented.
Date: October 16, 2007
Creator: Kabel, A.; Cai, Y.; Dohlus, M.; Sen, T. & Uplenchwar, R.
Partner: UNT Libraries Government Documents Department
open access

Development of a Fast High-Power Pulser and ILC DR Injection/Extraction Kicker

Description: Kicker is an efficient HOM power extractor. Peak HOM voltage and average power at the feeder may be sufficient to act on the kicker pulser. Feeder imperfections (real cable, feedthroughs, kicker electrodes, loads) is one source of residual energy between bunches. HOM spectrum is broad.
Date: October 16, 2007
Creator: Krasnykh, A.
Partner: UNT Libraries Government Documents Department
open access

SPENT FUEL CASK IMPACT LIMITER ATTACHMENT DESIGN DEFICIENCIES

Description: A recent structural analysis of the T-3 Spent Fuel Containment Cask found problems with the design of the attachment system. Assumptions in the original SARP concerning the loading in the attachment bolts were found to be inaccurate in certain drop orientations. Similar weaknesses in the attachment system designs of other casks were also noted. This paper documents the lessons learned and their applicability to impact limiter attachment system designs.
Date: October 16, 2007
Creator: Leduc, D & Jeffery England, J
Partner: UNT Libraries Government Documents Department
open access

Elastic constants and volume changes associated with two high-pressure rhombohedral phase transformations in vanadium

Description: We present results from ab-initio electronic-structure calculations of mechanical properties of the rhombohedral phase of vanadium reported in recent experiments (R Ia), and other predicted high-pressure phases (R Ib and bcc), focusing on properties relevant to dynamic experiments. We find that of the three transitions the largest volume collapse (1.3%) is for the R Ia to R Ib transition. Calculations of the single crystal and polycrystal elastic constants reveal a remarkably small discontinuit… more
Date: October 16, 2007
Creator: Lee, B; Rudd, R E; Klepeis, J E & Becker, R
Partner: UNT Libraries Government Documents Department
open access

TECHNICAL AND REGULATORY CONSIDERATIONS IN USING FREIGHT CONTAINERS AS INDUSTRIAL PACKAGES

Description: The United States (US) Department of Energy (DOE), Office of Environmental Management (EM), is actively pursuing activities to reduce the radiological risk and clean up the environmental legacy of the nation's nuclear weapons programs. EM has made significant progress in recent years in the clean-up and closure of sites and is also focusing on longer-term activities necessary for the completion of the clean-up program. The packaging and transportation of contaminated demolition debris and low-l… more
Date: October 16, 2007
Creator: Opperman, E; Mark Hawk, M & Ron Natali, R
Partner: UNT Libraries Government Documents Department
open access

Charm Meson Spectroscopy at BaBar and CLEO-C

Description: In this mini-review we report on the most recent progress in charm meson spectroscopy. We discuss the precision measurements performed by the BABAR and CLEO-c experiments in the non strange charm meson part and we present the newly discovered strange charmed meson excited states.
Date: October 16, 2007
Creator: Zghiche, A.
Partner: UNT Libraries Government Documents Department
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