Atlas-a facility for high energy density physics research at Los Alamos National Laboratory

2002 ◽  
Author(s):  
W.M. Parsons ◽  
W.A. Reass ◽  
J.R. Griego ◽  
D.W. Bowman ◽  
C. Thompson ◽  
...  
Keyword(s):  
Energy Density ◽  
National Laboratory ◽  
High Energy ◽  
High Energy Density ◽  
Alamos National Laboratory ◽  
Los Alamos ◽  
Los Alamos National Laboratory ◽  
High Energy Density Physics

scholarly journals Assessment of Model Confidence of a Laser Source Model in xRAGE Using Omega Direct-Drive Implosion Experiments

2018 ◽  
Vol 3 (4) ◽  
Author(s):  
Brandon M. Wilson ◽  
Aaron Koskelo
Keyword(s):  
Energy Density ◽  
National Laboratory ◽  
High Energy ◽  
Source Model ◽  
High Energy Density ◽  
Laser Source ◽  
Direct Drive ◽  
High Energy Density Physics ◽  
Model Confidence ◽  
Omega Laser

Los Alamos National Laboratory is interested in developing high-energy-density physics validation capabilities for its multiphysics code xRAGE. xRAGE was recently updated with the laser package Mazinisin to improve predictability. We assess the current implementation and coupling of the laser package via validation of laser-driven, direct-drive spherical capsule experiments from the Omega laser facility. The ASME V&V 20-2009 standard is used to determine the model confidence of xRAGE, and considerations for high-energy-density physics are identified. With current modeling capabilities in xRAGE, the model confidence is overwhelmed by significant systematic errors from the experiment or model. Validation evidence suggests cross-beam energy transfer as a dominant source of the systematic error.

Flash Proton Radiography

2015 ◽  
Vol 08 ◽  
pp. 165-180 ◽  
Author(s):  
Frank E. Merrill
Keyword(s):  
Temporal Structure ◽  
National Laboratory ◽  
High Energy ◽  
Full Potential ◽  
X Rays ◽  
Alamos National Laboratory ◽  
Proton Radiography ◽  
Los Alamos ◽  
Los Alamos National Laboratory ◽  
Wide Range

Protons were first investigated as radiographic probes as high energy proton accelerators became accessible to the scientific community in the 1960s. Like the initial use of X-rays in the 1800s, protons were shown to be a useful tool for studying the contents of opaque materials, but the electromagnetic charge of the protons opened up a new set of interaction processes which complicated their use. These complications in combination with the high expense of generating protons with energies high enough to penetrate typical objects resulted in proton radiography becoming a novelty, demonstrated at accelerator facilities, but not utilized to their full potential until the 1990s at Los Alamos. During this time Los Alamos National Laboratory was investigating a wide range of options, including X-rays and neutrons, as the next generation of probes to be used for thick object flash radiography. During this process it was realized that the charge nature of the protons, which was the source of the initial difficulty with this idea, could be used to recover this technique. By introducing a magnetic imaging lens downstream of the object to be radiographed, the blur resulting from scattering within the object could be focused out of the measurements, dramatically improving the resolution of proton radiography of thick systems. Imaging systems were quickly developed and combined with the temporal structure of a proton beam generated by a linear accelerator, providing a unique flash radiography capability for measurements at Los Alamos National Laboratory. This technique has now been employed at LANSCE for two decades and has been adopted around the world as the premier flash radiography technique for the study of dynamic material properties.

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