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Showing 1 to 20 of 77 for “"Los Alamos"”.
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Igniting The Light Elements: The Los Alamos Thermonuclear Weapon Project, 1942-1952
… In the postwar period a small number of Los Alamos Scientific Laboratory's staff and affiliates were responsible for theoretical work on fusion weapons, yet the program was subject to both the provisions and constraints of the U. S. Atomic Energy Commission, of which Los Alamos was a …
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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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Commemorating Controversy: Place-making at the Birthplace of the Bomb
… Manhattan Project built a secret laboratory at Los Alamos, New Mexico, for a single military purpose—to develop the world's first atomic weapons. Today, the remaining places and spaces of the bomb at Los Alamos are being preserved for future generations through their inclusion in the Manhattan …
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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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Measurement of spallation residuals in mercury for accelerator facility targets
… at the Weapon Neutron Research facility at the Los Alamos Neutron Science Center with 800 MeV protons. Following irradiation the production cross sections of 53 medium and longer-lived spallation residuals using gamma spectroscopy at various decay times up to a year were determined. The measured …
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Radiation Damage in Permanent Magnet Lenses
Proton radiography techniques in use at Los Alamos National Lab and elsewhere depend upon permanent magnet quadrupoles in their magnetic optics. Radiation exposure during radiography experiments is known to damage these lenses and degrade image quality. This effect is studied under controlled …
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Diffraction Studies Of Deformation In Shape Memory Alloys And Selected Engineering Components
… diffraction measurements during loading at the Los Alamos Neutron Science Center at Los Alamos National Laboratory. Three phenomena were investigated: First, the phenomena of hysteresis reduction and increase in linearity with increasing plastic deformation in superelastic NiTi. There is usually …
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Ionization Chamber Design, Development, and Testing for the UNM Fission Fragment Spectrometer
… (SPIDER) project is currently underway at Los Alamos National Labortory (LANL). The SPIDER project is intended to be a multi-armed spectrometer that will use high resolution measurements and event by-event analysis to add to the library of nuclear fission data. Our group at the University …
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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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Neutron-deuteron breakup and quasielastic scattering
… at the Weapons Neutron Research facility at the Los Alamos Neutron Science Center. The scattered neutrons from the d(n,np)n reaction are detected by a wall of neutron time-of-flight scintillators, and scattered protons are detected by two scintillators and a wire chamber. This setup allows for …
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Parameter estimation for unsaturated flow models
… from a large and uniformly packed lysimeter at Los Alamos National Laboratory. The experiment was intensively monitored, resulting in accurate input data for the inversion. Results obtained for this problem are very favorable, with excellent agreement between predicted and separately determined …
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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
… engineering model laboratory LIBS instrument at Los Alamos National Laboratory (LANL) at a 1.6 m standoff distance under 7 Torr CO2. Each LIBS location was pulsed with 150 shots at 3 Hz and 13.5 mJ/pulse. Comparison of NWA 7034 LIBS results with the bulk composition acquired with electron probe …
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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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A test of parity conservation in proton-proton scattering at 15 MeV
An experiment has been performed at the Los Alamos Scientific Laboratory tandem Van de Graaff to test the conservation of parity in proton-proton scattering. A parity violating effect was sought bv measuring the correlation bet\<1een the total p-p cross section and the he1icity of the incident …
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