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Title: Lens design challenges for scintillator-based neutron imaging

Abstract

Neutron imaging is an important diagnostic to study inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF) using neutrons emitted in the fusion reactions. Analysis of time-gated images of the primary fusion (14.1 MeV) and down-scattered (6-12 MeV) neutrons based on their time-of-flight allows for the reconstruction of the burning hot spot undergoing fusion and the surrounding cold fuel. The Los Alamos National Laboratory (LANL) Advanced Imaging team has been providing these images since 2011. Currently, two additional lines of sight are being designed and built for NIF to allow three-dimensional reconstructions. Neutron imaging relies on the conversion of neutrons into light to be captured by an imaging system through the use of a scintillator. Although the current neutron imaging system utilizes a fiber scintillator array, a newly designed imaging system will consist of a thick monolithic scintillator and custom-designed lenses to collect the light. The custom lens has to resolve an image produced in the thick volume of the scintillator and therefore needs a large depth of field.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [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)
OSTI Identifier:
1565856
Report Number(s):
LA-UR-18-28668
Journal ID: ISSN 0277-786X; 1996-756X (Electronic)
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396; AC52- 07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of SPIE - The International Society for Optical Engineering
Additional Journal Information:
Journal Volume: 10763; Conference: SPIE Optical Engineering + Applications, San Diego, CA (United States), 19-23 Aug 2018; Journal ID: ISSN 0277-786X
Publisher:
SPIE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; inertial confinement fusion; nuclear diagnostics; neutron imaging; neutron time-of-flight; lens design; scintillators

Citation Formats

Geppert-Kleinrath, Verena, Volegov, Petr L., Wilde, Carl A., Tafoya, Landon, Vaughan, Jacquelynne, Fatherley, Valerie, Danly, Christopher, and Mendoza, Emily Faith. Lens design challenges for scintillator-based neutron imaging. United States: N. p., 2018. Web. doi:10.1117/12.2322920.
Geppert-Kleinrath, Verena, Volegov, Petr L., Wilde, Carl A., Tafoya, Landon, Vaughan, Jacquelynne, Fatherley, Valerie, Danly, Christopher, & Mendoza, Emily Faith. Lens design challenges for scintillator-based neutron imaging. United States. doi:10.1117/12.2322920.
Geppert-Kleinrath, Verena, Volegov, Petr L., Wilde, Carl A., Tafoya, Landon, Vaughan, Jacquelynne, Fatherley, Valerie, Danly, Christopher, and Mendoza, Emily Faith. Tue . "Lens design challenges for scintillator-based neutron imaging". United States. doi:10.1117/12.2322920. https://www.osti.gov/servlets/purl/1565856.
@article{osti_1565856,
title = {Lens design challenges for scintillator-based neutron imaging},
author = {Geppert-Kleinrath, Verena and Volegov, Petr L. and Wilde, Carl A. and Tafoya, Landon and Vaughan, Jacquelynne and Fatherley, Valerie and Danly, Christopher and Mendoza, Emily Faith},
abstractNote = {Neutron imaging is an important diagnostic to study inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF) using neutrons emitted in the fusion reactions. Analysis of time-gated images of the primary fusion (14.1 MeV) and down-scattered (6-12 MeV) neutrons based on their time-of-flight allows for the reconstruction of the burning hot spot undergoing fusion and the surrounding cold fuel. The Los Alamos National Laboratory (LANL) Advanced Imaging team has been providing these images since 2011. Currently, two additional lines of sight are being designed and built for NIF to allow three-dimensional reconstructions. Neutron imaging relies on the conversion of neutrons into light to be captured by an imaging system through the use of a scintillator. Although the current neutron imaging system utilizes a fiber scintillator array, a newly designed imaging system will consist of a thick monolithic scintillator and custom-designed lenses to collect the light. The custom lens has to resolve an image produced in the thick volume of the scintillator and therefore needs a large depth of field.},
doi = {10.1117/12.2322920},
journal = {Proceedings of SPIE - The International Society for Optical Engineering},
issn = {0277-786X},
number = ,
volume = 10763,
place = {United States},
year = {2018},
month = {9}
}

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