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Conversion-electron experiment to characterize the decay of the /sup 237/Np shape isomer

Description: Conversion electrons from the decay of low-lying levels of /sup 237/Np have been measured to detect the population of these levels by gamma-ray decay of the /sup 237/Np shape isomer. Analysis of the 208-keV transition L conversion-electron peak gives an upper limit of about 17 ..mu..b for the population of the 3/2/sup -/ 267-keV level in /sup 237/Np from the shape isomer decay. Model calculations are compared with the measured limit. Improvements are suggested for this experiment. 9 refs., 4 fi… more
Date: December 8, 1987
Creator: Henry, E. A.; Becker, J. A.; Bauer, R. W.; Gardner, D. G.; Decman, D. J.; Meyer, R. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Energy balance in laser-irradiated vaporizing droplets

Description: We analyze the interactions of atmospheric aerosols with a high-energy laser beam. The energy balance equation allows us to compute the conversion of the pulse energy into temperature increase, vaporization, conduction, and convection. We also include the shrinkage term whose significance has recently been discussed by Davies and Brock.
Date: September 8, 1987
Creator: Zardecki, A. & Armstrong, R.L.
Partner: UNT Libraries Government Documents Department
open access

XUV emission features from the Livermore soft x-ray laser experiments

Description: The measured wavelengths in the soft x-ray region for 3p to 3s and 3d to 3p transitions in neon-, sodium-, and magnesium-like selenium are presented. The experimental results for the neon-like ions are compared to theoretical wavelength values and with values extrapolated along the isoelectronic sequence. The ions were contained in a plasma heated in a line-focus of a Nd-glass laser. The measurements were made with a time-gated microchannel-plate-intensified grazing incidence spectrograph.
Date: September 8, 1987
Creator: Eckart, M. J.; Scofield, J. H. & Hazi, A. U.
Partner: UNT Libraries Government Documents Department
open access

Mixed oxide fuel development

Description: This paper describes the success of the ongoing mixed-oxide fuel development program in the United States aimed at qualifying an economical fuel system for liquid metal cooled reactors. This development has been the cornerstone of the US program for the past 20 years and has proceeded in a deliberate and highly disciplined fashion with high emphasis on fuel reliability and operational safety as major features of an economical fuel system. The program progresses from feature testing in EBR-II to… more
Date: May 8, 1987
Creator: Leggett, R. D. & Omberg, R. P.
Partner: UNT Libraries Government Documents Department
open access

Adiabatic supernova expansion into the circumstellar medium

Description: We perform one dimensional numerical simulations with a Lagrangian hydrodynamics code of the adiabatic expansion of a supernova into the surrounding medium. The early expansion follows Chevalier's analytic self-similar solution until the reverse shock reaches the ejecta core. We follow the expansion as it evolves towards the adiabatic blast wave phase. Some memory of the earlier phases of expansion is retained in the interior even when the outer regions expand as a blast wave. We find the resul… more
Date: June 8, 1987
Creator: Band, D.L. & Liang, E.P.
Partner: UNT Libraries Government Documents Department
open access

The ACP (Advanced Computer Program) Branch bus and real-time applications of the ACP multiprocessor system

Description: The ACP Branchbus, a high speed differential bus for data movement in multiprocessing and data acquisition environments, is described. This bus was designed as the central bus in the ACP multiprocessing system. In its full implementation with 16 branches and a bus switch, it will handle data rates of 160 MByte/sec and allow reliable data transmission over inter rack distances. We also summarize applications of the ACP system in experimental data acquisition, triggering and monitoring, with spec… more
Date: May 8, 1987
Creator: Hance, R.; Areti, H.; Atac, R.; Biel, J.; Cook, A.; Fischler, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Experimental characteristics of a high-gain free-electron laser amplifier operating at 8-mm and 2-mm wavelengths

Description: The Electron Laser Facility (ELF) at the Lawrence Livermore National Laboratory (LLNL) uses a high-current induction linac (3.5 MeV, 1000 A), in conjunction with a pulsed electromagnetic wiggler (4.0 M, 4000 G), to operate a free electron laser (FEL) that produces intense radiation in the microwave regime (2 to 8 mm). ELF is a high-gain, single-pass amplifier, using a commercial microwave source as an oscillator input (200 W-50 kW). Previous experiments at 35 GHz produced exponential gains of 4… more
Date: June 8, 1987
Creator: Throop, A. L.; Orzechowski, T. J.; Anderson, B. R.; Chambers, F. W.; Clark, J. C.; Fawley, W. M. et al.
Partner: UNT Libraries Government Documents Department
open access

The Mirror Fusion Test Facility cryogenic system: Performance, management approach, and present equipment status

Description: The cryogenic system for the Mirror Fusion Test Facility (MFTF) is a 14-kW, 4.35-K helium refrigeration system that proved to be highly successful and cost-effective. All operating objectives were met, while remaining within a few percent of initial cost and schedule plans. The management approach used in MFTF allowed decisions to be made quickly and effectively, and it helped keep costs down. Manpower levels, extent and type of industrial participation, key aspects of subcontractor specificati… more
Date: June 8, 1987
Creator: Slack, D.S. & Chronis, W.C.
Partner: UNT Libraries Government Documents Department
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