A5047694752- Space Technology and Applications
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- High-Velocity Impact and Material Behavior
- CCD and CMOS Imaging Sensors
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Astronomy and Astrophysical Research
- Particle physics theoretical and experimental studies
- Electromagnetic Launch and Propulsion Technology
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
- Ion-surface interactions and analysis
- Dark Matter and Cosmic Phenomena
- Magnetic confinement fusion research
- Stellar, planetary, and galactic studies
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear reactor physics and engineering
Los Alamos National Laboratory
2014-2024
IMDEA Materials
2020
SLAC National Accelerator Laboratory
2020
Colorado School of Mines
2020
Argonne National Laboratory
2020
Brookhaven National Laboratory
1996-2003
Supercon (United States)
2002
Trex (United States)
2002
IDEX Corporation (United States)
1995
Lawrence Berkeley National Laboratory
1972
Abstract We present experimental results supporting physics-based ejecta model development, where our main assumption is that form as a special limiting case of Richtmyer–Meshkov (RM) instability at metal–vacuum interface. From this assumption, we test established theory unstable spike and bubble growth rates, rates link to the wavelength amplitudes surface perturbations. evaluate rate through novel application modern laser Doppler velocimetry (LDV) techniques, coincidentally measure...
The accuracy of density measurements and position resolution in flash (40 ns) radiography thick objects with 24 Gev/c protons is investigated. A global model fit to step wedge data shown give a good description spanning the periodic table. parameters obtained from are used predict transmission through French Test Object (FTO), test object nested spheres, precision better than 1%. Multiple trials have been show that systematic errors less 2%. Absolute agreement between average radiographic...
This article describes the design and performance of a magnifying magnetic-lens system designed, built, commissioned at Los Alamos National Laboratory (LANL) for 800 MeV flash proton radiography. The technique radiography has been developed LANL to study material properties under dynamic loading conditions through analysis time sequences radiographs. requirements this growing experimental program have resulted in need improvements spatial radiographic resolution. To meet these needs, new...
Recently a new high energy proton microscopy facility PRIOR (Proton Microscope for FAIR) has been designed, constructed and successfully commissioned at GSI Helmholtzzentrum f\"ur Schwerionenforschung (Darmstadt, Germany). As result of the experiments with 3.5-4.5 GeV beams delivered by heavy ion synchrotron SIS-18 GSI, 30 um spatial 10 ns temporal resolutions microscope have demostrated. A pulsed power setup studying properties matter under extremes developed dynamic commissioning facility....
Direct density measurements were made from shock-loaded aluminum and copper samples by combining plate-impact experiments with proton radiography at the Los Alamos Neutron Science Center. Flyer plates accelerated using a 40 mm bore powder gun to create shock wave in sample. The sample material was then interrogated real time facility. increase behind front causes measurable change transmission of protons through sample, which can be quantified as value material. Hugoniot values calculated...
Hydro code implementations of ejecta dynamics at shocked interfaces presume a source distribution function particulate masses and velocities, f0(m,u;t). Some properties this have been determined from Taylor- supported-shockwave experiments. Such experiments measure the mass moment f0 under vacuum conditions assuming weak particle-particle interactions and, usually, fully inelastic scattering (capture) particles piezoelectric diagnostic probes. Recently, planar ejection W into vacuum, Ar, Xe...
Proton radiography was invented in the 1990’s at Los Alamos National Laboratory (LANL) as a diagnostic to study dynamic material properties under extreme pressures, strain and rate. Since this time hundreds of proton experiments have been performed LANL facility has commissioned Institute for Theoretical Experimental Physics (ITEP) Russia similar applications studies. Recently an international effort investigated new capability Facility Anti‐proton Ion Research (FAIR) located Darmstadt,...
We present experimental results supporting physics based ejecta model development, where we assume form as a special limiting case of Richtmyer-Meshkov (RM) instability with Atwood number A = -1. and use data to test established RM spike bubble growth rate theory through application modern laser Doppler velocimetry techniques applied in novel manner coincidentally measure velocities from shocked metals. also explore the link formation solid material its plastic flow stress at high-strain...
Historically, metals are cut up and polished to see the structure infer how processing influences evolution. We can now peer into a metal during without destroying it using proton radiography. Understanding link between is important because profoundly affects properties of engineering materials. Synchrotron x-ray radiography has enabled real-time glimpses solidification. However, energies favor examination small volumes low density metals. Here we use high energy for first time image large...
An application of nuclear physics, a facility for using protons flash radiography, has been developed at the Los Alamos Neutron Science Center (LANSCE). Protons have proven far superior to high energy x-rays radiography because their long mean free path, good position resolution, and low scatter background. Although this is primarily used studying very fast phenomena such as explosive driven experiments, it finding increasing other fields, tomography static objects, phase changes in...
We report proton transmission images obtained subsequent to the laser assisted thermal ignition of a sample PBX 9501 (a plastic bonded formulation explosive nitramine octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX)). describe technique as means synchronize non-linear event while preserving post-ignition behavior. have dynamic at two spatial magnifications and viewed both radial transverse axis solid cylindrical encased in aluminum. Images been with 3 15 μs temporal resolution...
High energy electrons have been used to investigate an extension of transmission electron microscopy. This technique, high microscopy (THEEM), provides two additional capabilities First, are more penetrating than low electrons, and thus, they able image through thicker samples. Second, the accelerating mode a radio-frequency linear accelerator fast exposures, down 1 ps, which ideal for flash radiography, making THEEM well suited study evolution material processes under dynamic conditions....
We present data that indicate nonuniform magnetization loss due to radiation damage in neodymium-iron-boron Halbach-style permanent magnet quadrupoles. The proton radiography (pRad) facility at Los Alamos uses permanent-magnet quadrupoles for magnifying lenses, and a system recently commissioned GSI-Darmsdadt magnets its primary lenses. Large fluences of spallation neutrons can be produced close proximity these when the beam is, intentionally or unintentionally, directed into tungsten...
Protons from the Los Alamos Neutron Science Center have been used for pulsed radiography in dynamic experiments past 25 years. Pulses of protons are imaged on a scintillator, and light these images is captured by fast gated cameras. The need fast, bright scintillators has led to some compromises image quality due tiling backgrounds with totally internally reflected light. We show how large-grain scintillator screens, made using thin plastic binder, solve problems.
We report proton transmission images obtained during direct heating of a sample PBX 9501 (a plastic bonded formulation the explosive nitramine octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX)) prior to ignition thermal explosion. describe application radiography using 800 MeV accelerator at Los Alamos National Laboratory obtain in these explosion experiments. have two spatial magnifications and viewing both radial transverse axes solid cylindrical encased aluminum. During we observe...
We present the development of an explosively driven physics tool to generate two mostly uniaxial shockwaves. The is being used extend single shockwave ejecta models account for a second few microseconds later. explore techniques vary amplitude both first and shockwaves, we apply experimentally at Los Alamos National Laboratory Proton Radiography (pRad)facility. tools have been applied Sn with perturbations wavelength λ = 550 μm, various amplitudes that give wavenumber products kh ∊...
Relativistic, magnetically focused proton radiography was invented at Los Alamos National Laboratory using the 800 MeV LANSCE beam and is inherently well-suited to imaging dense objects, areal densities >20 g cm-2. However, if unscattered portion of transmitted removed Fourier plane through inverse-collimation, this system becomes highly sensitive very thin media, <100 mg Here, inverse-collimation scheme described in detail demonstrated by Xe gas with a shockwave generated an aluminum plate...
Flash radiography with 800 MeV kinetic energy protons at Los Alamos National Laboratory is an important experimental tool for investigations of dynamic material behavior driven by high explosives or pulsed power. The extraction quantitative information about density fields in a experiment from proton generated images requires fidelity model the imaging process. It shown that accurate calculations transmission through magnetic lens system require terms beyond second order far tune energy....
Exploding bridgewire detonators are an industry standard technology used for over 75 years and valued their precise timing safety characteristics. Despite widespread use, functional mechanism remains controversial with both shock non-shock mechanisms attributed. In this work, we reexamine the detonator function a suite of modern diagnostics compare these observations existing literature. Traditional consisted voltage applied to time dependent current, integral response measurements such as...
A new burst-mode, 10-frame, hybrid Si-sensor/CMOS-ROIC FPA chip has been recently fabricated at Teledyne Imaging Sensors. The intended primary use of the sensor is in multi-frame 800 MeV proton radiography LANL. basic part a large (48×49 mm<sup>2</sup>) stitched CMOS 1100×1100 pixel count, with minimum shutter speed 50 ns. performance parameters this are compared to first generation 3-frame 0.5-Mpixel custom imager. cameras have continuous for many years, variety static and dynamic...