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Showing 1 to 20 of 44 for “"Los Alamos National Laboratory"”.
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Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer
… The experiment, RHO, was carried out at the Los Alamos Meson Physics Facility (LAMPF) of Los Alamos National Laboratory (LANL) in New Mexico, USA, in 1993. The existing experimental set-up that was built for the MEGA experiment was used for the RHO measurement. The experiment was a …
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Differential cross section measurement for the d(n,np) reaction
… Research (WNR) spallation neutron beam at the Los Alamos Neutron Science Center at the Los Alamos National Laboratory. Cross sections were computed for the incident neutron energy ranges of 10010, 20010, and 30010 MeV. We used proton detectors covering a range of = 17 - 25 in the lab frame, and …
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Experimental analysis of beam B-Dot sensors
… sensors (B-dots) has been developed at Los Alamos National Laboratory. Experiments and tests were performed using the Relativistic Electron Beam Experiment (REX) machine to compare the B-dot sensors to optical beam diagnostics (streak camera). the B- dots were assessed to have the …
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Pulse shaping techniques for mega ampere current on Atlas pulsed power machine
… world's largest pulsed power systems designed by Los Alamos National Laboratory (LANL) to perform high energy density experiments in support of weapon-physics and basic research programs. The current pulse generated by Atlas is a damped sinusoid that rises to nearly 30 MA in 6 microseconds as it …
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Monte Carlo simulation of neutron shielding for proton therapy facilities
… System, a set of Monte Carlo codes developed at Los Alamos National Laboratory. Additional software tools for reading and analyzing the simulation data that the model provides have been developed and tested. In order to verify the computer simulations, neutron detection and data acquisition …
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Evaluation of the bubble spectrometer performance in space-like neutron fields
… neutrons from 6.0×105 eV to 7.50 ×108 eV at the Los Alamos National Laboratory. The analysis of the obtained data provided a calibration factor to adjust the neutron sensitivity, to high-energy neutrons of the SBDS, based on its response function matrix. The results suggest that the SBDS …
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A time-of-flight spectrometer for fission fragment identification
… to be fielded at the LANSCE facility at Los Alamos National Laboratory at a later date. The development and performance of the prototype single module, timing detector has shown improved efficiency (68%-70%) and sharper microchannel plate vs. surface barrier coincidence event …
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Laser induced breakdown spectroscopy of martian breccia Northwest Africa 7034: comparison with Mars Science Laboratory results
The Mars Science Laboratory (MSL) rover is utilizing laser-induced breakdown spectroscopy (LIBS) instrumentation to determine compositions of rocks shot in Gale crater, Mars, from a distance of 1.56-7 meters. At the same time, martian breccia meteorite Northwest Africa (NWA) 7034 was analyzed with …
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Benchmarking photoneutron production of Mcnpx simulations with experimental results
… a radiation transport code developed at the Los Alamos National Laboratory, was used in this study. The MCNPX predictions of photo-neutron production were compared with experimental results performed at Idaho Accelerator Centre (IAC), and showed good agreement.
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SEU-Induced Persistent Error Propagation in FPGAs
… signal processing application in use at Los Alamos National Laboratory was improved by nearly two orders of magnitude at a theoretical savings of over 53% over traditional comprehensive mitigation techniques such as full TMR.
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Innovative Methods for Solving Multicomponent Biogeochemical Groundwater Transport on Supercomputers
… contamination on the ASCI Q supercomputer at Los Alamos National Laboratory, on which a study of parallel efficiency/scaling using up to 512 processors was conducted. Recently, researchers have been investigating emplacement of carbon sources to create anaerobic conditions and enhance in situ …
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Neutron-deuteron elastic scattering and three-nucleon force
… 140 - 240 MeV at the LANSCE/WNR facility of the Los Alamos National Laboratory. Witala et al. (H. Witala et al. ), Phys. Rev. Lett. 81, 1183 (1998) have suggested that the differential cross section for nucleon-deuteron scattering at large angles may be sensitive to the presence of a …
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Flexure based mounts for sensitive payloads : a management and engineering study
With the cooperation of the Los Alamos National Laboratory and the Massachusetts Institute of Technology, an investigative and design study was performed to examine the history of the W80- 0 Area Aft Mount, understand its performance, and explore potential new designs. Simultaneously, professional …
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An ionization chamber for fission fragment analysis
… ultimately take place at the LANSCE facility at Los Alamos National Laboratory. A full spectrum of the pertinent variables dictating the functionality of the ionization chamber have been investigated and characterized where an energy resolution of just below 1.5% was achieved.
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Zirconium alloy getter bed air-ingress thermal failure analysis
… in the Tritium Science and Engineering group at Los Alamos National Laboratory to confirm the results that the primary bed container will not fail from overheating. The oxidation of St-909 pellets was modeled and determined to be limited by the oxide diffusing into the pellet material. An …
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Development of 11-plex assay for the rapid screening of samples for detection of Shiga toxin-producing E. coli
… PCR) is a nucleic acid based assay patented at Los Alamos National Laboratory (LANL) that uses flow cytometry and multiplex microsphere arrays for detection of nucleic acid based signatures. By using MOL-PCR for detecting unique STEC DNA signatures in samples from the beef supply chain (farm to …
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Modeling and Analysis of Actinide Diffusion Behavior in Irradiated Metal Fuel
… calculations for this work were conducted at Los Alamos National Laboratory (LANL) in support of on-going activities related to sensitivity analysis of fuel performance codes. A sensitivity analysis of FEAST-Metal was completed to identify important macroscopic parameters of interest to …
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Scalable Surrogates for Counts and Computer Experiments
… data and associated computer models developed at Los Alamos National Laboratory.
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Mode Choice Methodology in TRANSIMS
… developed under US DOT's and EPA funding at the Los Alamos National Laboratory (LANL). It is an integrated system of travel forecasting models designed to give transportation planners accurate, complete information on traffic impacts, congestion, and pollution by simulating second-by-second …
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Photoionization of Se Ions for the Determination of Elemental Abundances in Astrophysical Nebulae
… Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory using the merged-beams technique. All ions except Se5+ were measured from the energy region of the low-lying metastable state thresholds to at least 10 eV above the ionization potential. Theoretical calculations for Se5+ …
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