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Title: Requirements and sensitivity analysis for temporally- and spatially-resolved thermometry using neutron resonance spectroscopy

Abstract

Neutron resonance spectroscopy (NRS) has been used extensively to make temperature measurements that are accurate, absolute, and nonperturbative within the interior of material samples under extreme conditions applied quasistatically. Yet NRS has seldom been used in dynamic experiments. There is a compelling incentive to do so because of the significant shortcomings of alternative techniques. An important barrier to adopting dynamic NRS thermometry is the difficulty in fielding it with conventional spallation neutron sources. To enable time-dependent and spatially resolved temperature measurements in dynamic environments, more compact neutron sources that can be used at user facilities in conjunction with other diagnostic probes (such as x-ray light sources) are required. Such sources may be available using ultrafast high-intensity optical lasers. We evaluate such possibilities by determining the sensitivities of the temperature estimate on neutron-beam and diagnostic parameters. Based on that evaluation, requirements are set on a pulsed neutron-source and diagnostics to make a meaningful dynamic temperature measurement. Dynamic thermometry measurements are examined in this context when driven by two alternative fast-neutron sources: the Los Alamos Neutron Scattering Center (LANSCE) proton accelerator driving isotropic spallation neutrons as a baseline and a laser-plasma ion accelerator driving a neutron beam from deuterium breakup. Strategies tomore » close the gap between the required and demonstrated performance of laser-based fast-neutron sources are presented. A short-pulse high-intensity laser with state-of-the-art pulse contrast and an energy of a few hundred Joules would drive a compact neutron source suitable for NRS thermometry that could transform the dynamic study of materials.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
OSTI Identifier:
1571591
Alternate Identifier(s):
OSTI ID: 1562563
Report Number(s):
LA-UR-18-21191
Journal ID: ISSN 0034-6748; TRN: US2100285
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Fernández, Juan Carlos, Barnes, Cris William, Mocko, Michael Jeffrey, and Zavorka, Lukas. Requirements and sensitivity analysis for temporally- and spatially-resolved thermometry using neutron resonance spectroscopy. United States: N. p., 2019. Web. doi:10.1063/1.5031038.
Fernández, Juan Carlos, Barnes, Cris William, Mocko, Michael Jeffrey, & Zavorka, Lukas. Requirements and sensitivity analysis for temporally- and spatially-resolved thermometry using neutron resonance spectroscopy. United States. https://doi.org/10.1063/1.5031038
Fernández, Juan Carlos, Barnes, Cris William, Mocko, Michael Jeffrey, and Zavorka, Lukas. Wed . "Requirements and sensitivity analysis for temporally- and spatially-resolved thermometry using neutron resonance spectroscopy". United States. https://doi.org/10.1063/1.5031038. https://www.osti.gov/servlets/purl/1571591.
@article{osti_1571591,
title = {Requirements and sensitivity analysis for temporally- and spatially-resolved thermometry using neutron resonance spectroscopy},
author = {Fernández, Juan Carlos and Barnes, Cris William and Mocko, Michael Jeffrey and Zavorka, Lukas},
abstractNote = {Neutron resonance spectroscopy (NRS) has been used extensively to make temperature measurements that are accurate, absolute, and nonperturbative within the interior of material samples under extreme conditions applied quasistatically. Yet NRS has seldom been used in dynamic experiments. There is a compelling incentive to do so because of the significant shortcomings of alternative techniques. An important barrier to adopting dynamic NRS thermometry is the difficulty in fielding it with conventional spallation neutron sources. To enable time-dependent and spatially resolved temperature measurements in dynamic environments, more compact neutron sources that can be used at user facilities in conjunction with other diagnostic probes (such as x-ray light sources) are required. Such sources may be available using ultrafast high-intensity optical lasers. We evaluate such possibilities by determining the sensitivities of the temperature estimate on neutron-beam and diagnostic parameters. Based on that evaluation, requirements are set on a pulsed neutron-source and diagnostics to make a meaningful dynamic temperature measurement. Dynamic thermometry measurements are examined in this context when driven by two alternative fast-neutron sources: the Los Alamos Neutron Scattering Center (LANSCE) proton accelerator driving isotropic spallation neutrons as a baseline and a laser-plasma ion accelerator driving a neutron beam from deuterium breakup. Strategies to close the gap between the required and demonstrated performance of laser-based fast-neutron sources are presented. A short-pulse high-intensity laser with state-of-the-art pulse contrast and an energy of a few hundred Joules would drive a compact neutron source suitable for NRS thermometry that could transform the dynamic study of materials.},
doi = {10.1063/1.5031038},
journal = {Review of Scientific Instruments},
number = 9,
volume = 90,
place = {United States},
year = {Wed Sep 18 00:00:00 EDT 2019},
month = {Wed Sep 18 00:00:00 EDT 2019}
}

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Figures / Tables:

FIG. 1 FIG. 1: A diagram of the concept for dynamic NRS with a laser-driven source.

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