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Title: Shot-by-shot Spectrum Model for Rod-pinch, Pulsed Radiography Machines

A simplified model of bremsstrahlung production is developed for determining the x-ray spectrum output of a rod-pinch radiography machine, on a shot-by-shot basis, using the measured voltage, V(t), and current, I(t). The motivation for this model is the need for an agile means of providing shot-by-shot spectrum prediction, from a laptop or desktop computer, for quantitative radiographic analysis. Simplifying assumptions are discussed, and the model is applied to the Cygnus rod-pinch machine. Output is compared to wedge transmission data for a series of radiographs from shots with identical target objects. Resulting model enables variation of parameters in real time, thus allowing for rapid optimization of the model across many shots. “Goodness of fit” is compared with output from LSP Particle-In-Cell code, as well as the Monte Carlo Neutron Propagation with Xrays (“MCNPX”) model codes, and is shown to provide an excellent predictive representation of the spectral output of the Cygnus machine. In conclusion, improvements to the model, specifically for application to other geometries, are discussed.
Authors:
ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-30436
Journal ID: ISSN 2158-3226 (Electronic)
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 8; Journal Issue: 2; Journal ID: ISSN 2158-3226 (Electronic)
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Bremsstrahlung; model; rod-pinch; radiography
OSTI Identifier:
1431069
Alternate Identifier(s):
OSTI ID: 1419817

Wood, William Monford. Shot-by-shot Spectrum Model for Rod-pinch, Pulsed Radiography Machines. United States: N. p., Web. doi:10.1063/1.5016299.
Wood, William Monford. Shot-by-shot Spectrum Model for Rod-pinch, Pulsed Radiography Machines. United States. doi:10.1063/1.5016299.
Wood, William Monford. 2018. "Shot-by-shot Spectrum Model for Rod-pinch, Pulsed Radiography Machines". United States. doi:10.1063/1.5016299. https://www.osti.gov/servlets/purl/1431069.
@article{osti_1431069,
title = {Shot-by-shot Spectrum Model for Rod-pinch, Pulsed Radiography Machines},
author = {Wood, William Monford},
abstractNote = {A simplified model of bremsstrahlung production is developed for determining the x-ray spectrum output of a rod-pinch radiography machine, on a shot-by-shot basis, using the measured voltage, V(t), and current, I(t). The motivation for this model is the need for an agile means of providing shot-by-shot spectrum prediction, from a laptop or desktop computer, for quantitative radiographic analysis. Simplifying assumptions are discussed, and the model is applied to the Cygnus rod-pinch machine. Output is compared to wedge transmission data for a series of radiographs from shots with identical target objects. Resulting model enables variation of parameters in real time, thus allowing for rapid optimization of the model across many shots. “Goodness of fit” is compared with output from LSP Particle-In-Cell code, as well as the Monte Carlo Neutron Propagation with Xrays (“MCNPX”) model codes, and is shown to provide an excellent predictive representation of the spectral output of the Cygnus machine. In conclusion, improvements to the model, specifically for application to other geometries, are discussed.},
doi = {10.1063/1.5016299},
journal = {AIP Advances},
number = 2,
volume = 8,
place = {United States},
year = {2018},
month = {2}
}