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Title: Quantification of uncertainty in photon source spot size inference during laser-driven radiography experiments at TRIDENT

Abstract

Images of the R2DTO resolution target were obtained during laser-driven-radiography experiments performed at the TRIDENT laser facility, and analysis of these images using the Bayesian Inference Engine (BIE) determines a most probable full-width half maximum (FWHM) spot size of 78 μm. However, significant uncertainty prevails due to variation in the measured detector blur. Propagating this uncertainty in detector blur through the forward model results in an interval of probabilistic ambiguity spanning approximately 35-195 μm when the laser energy impinges on a thick (1 mm) tantalum target. In other phases of the experiment, laser energy is deposited on a thin (~100 nm) aluminum target placed 250 μm ahead of the tantalum converter. When the energetic electron beam is generated in this manner, upstream from the bremsstrahlung converter, the inferred spot size shifts to a range of much larger values, approximately 270-600 μm FWHM. This report discusses methods applied to obtain these intervals as well as concepts necessary for interpreting the result within a context of probabilistic quantitative inference.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Rochester, NY (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1402669
Report Number(s):
LA-UR-17-28604
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; radiography; laser-driven radiography; uncertainty

Citation Formats

Tobias, Benjamin John, Palaniyappan, Sasikumar, Gautier, Donald Cort, Mendez, Jacob, Burris-Mog, Trevor John, Huang, Chengkun K., Favalli, Andrea, Hunter, James F., Espy, Michelle E., Schmidt, Derek William, Nelson, Ronald Owen, Sefkow, Adam, Shimada, Tsutomu, Johnson, Randall Philip, and Fernandez, Juan Carlos. Quantification of uncertainty in photon source spot size inference during laser-driven radiography experiments at TRIDENT. United States: N. p., 2017. Web. doi:10.2172/1402669.
Tobias, Benjamin John, Palaniyappan, Sasikumar, Gautier, Donald Cort, Mendez, Jacob, Burris-Mog, Trevor John, Huang, Chengkun K., Favalli, Andrea, Hunter, James F., Espy, Michelle E., Schmidt, Derek William, Nelson, Ronald Owen, Sefkow, Adam, Shimada, Tsutomu, Johnson, Randall Philip, & Fernandez, Juan Carlos. Quantification of uncertainty in photon source spot size inference during laser-driven radiography experiments at TRIDENT. United States. doi:10.2172/1402669.
Tobias, Benjamin John, Palaniyappan, Sasikumar, Gautier, Donald Cort, Mendez, Jacob, Burris-Mog, Trevor John, Huang, Chengkun K., Favalli, Andrea, Hunter, James F., Espy, Michelle E., Schmidt, Derek William, Nelson, Ronald Owen, Sefkow, Adam, Shimada, Tsutomu, Johnson, Randall Philip, and Fernandez, Juan Carlos. Tue . "Quantification of uncertainty in photon source spot size inference during laser-driven radiography experiments at TRIDENT". United States. doi:10.2172/1402669. https://www.osti.gov/servlets/purl/1402669.
@article{osti_1402669,
title = {Quantification of uncertainty in photon source spot size inference during laser-driven radiography experiments at TRIDENT},
author = {Tobias, Benjamin John and Palaniyappan, Sasikumar and Gautier, Donald Cort and Mendez, Jacob and Burris-Mog, Trevor John and Huang, Chengkun K. and Favalli, Andrea and Hunter, James F. and Espy, Michelle E. and Schmidt, Derek William and Nelson, Ronald Owen and Sefkow, Adam and Shimada, Tsutomu and Johnson, Randall Philip and Fernandez, Juan Carlos},
abstractNote = {Images of the R2DTO resolution target were obtained during laser-driven-radiography experiments performed at the TRIDENT laser facility, and analysis of these images using the Bayesian Inference Engine (BIE) determines a most probable full-width half maximum (FWHM) spot size of 78 μm. However, significant uncertainty prevails due to variation in the measured detector blur. Propagating this uncertainty in detector blur through the forward model results in an interval of probabilistic ambiguity spanning approximately 35-195 μm when the laser energy impinges on a thick (1 mm) tantalum target. In other phases of the experiment, laser energy is deposited on a thin (~100 nm) aluminum target placed 250 μm ahead of the tantalum converter. When the energetic electron beam is generated in this manner, upstream from the bremsstrahlung converter, the inferred spot size shifts to a range of much larger values, approximately 270-600 μm FWHM. This report discusses methods applied to obtain these intervals as well as concepts necessary for interpreting the result within a context of probabilistic quantitative inference.},
doi = {10.2172/1402669},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 24 00:00:00 EDT 2017},
month = {Tue Oct 24 00:00:00 EDT 2017}
}

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