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Title: Positron radiography of ignition-relevant ICF capsules

Abstract

Laser-generated positrons are evaluated as a probe source to radiograph in-flight ignition-relevant inertial confinement fusion capsules. Current ultraintense laser facilities are capable of producing 2 ×1012 relativistic positrons in a narrow energy bandwidth and short time duration. Monte Carlo simulations suggest that the unique characteristics of such positrons allow for the reconstruction of both capsule shell radius and areal density between 0.002 and 2g/cm2. The energy-downshifted positron spectrum and angular scattering of the source particles are sufficient to constrain the conditions of the capsule between preshot and stagnation. Here, we evaluate the effects of magnetic fields near the capsule surface using analytic estimates where it is shown that this diagnostic can tolerate line integrated field strengths of 100 T mm.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1416515
Alternate Identifier(s):
OSTI ID: 1412620; OSTI ID: 1430964
Report Number(s):
LLNL-JRNL-734462; LLNL-JRNL-742179
Journal ID: ISSN 1070-664X; TRN: US1800949
Grant/Contract Number:  
AC52-07NA27344; 17-ERD-010
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 12; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Williams, G. J., Chen, Hui, Field, J. E., Landen, O. L., and Strozzi, D. J. Positron radiography of ignition-relevant ICF capsules. United States: N. p., 2017. Web. doi:10.1063/1.5008426.
Williams, G. J., Chen, Hui, Field, J. E., Landen, O. L., & Strozzi, D. J. Positron radiography of ignition-relevant ICF capsules. United States. doi:10.1063/1.5008426.
Williams, G. J., Chen, Hui, Field, J. E., Landen, O. L., and Strozzi, D. J. Mon . "Positron radiography of ignition-relevant ICF capsules". United States. doi:10.1063/1.5008426. https://www.osti.gov/servlets/purl/1416515.
@article{osti_1416515,
title = {Positron radiography of ignition-relevant ICF capsules},
author = {Williams, G. J. and Chen, Hui and Field, J. E. and Landen, O. L. and Strozzi, D. J.},
abstractNote = {Laser-generated positrons are evaluated as a probe source to radiograph in-flight ignition-relevant inertial confinement fusion capsules. Current ultraintense laser facilities are capable of producing 2 ×1012 relativistic positrons in a narrow energy bandwidth and short time duration. Monte Carlo simulations suggest that the unique characteristics of such positrons allow for the reconstruction of both capsule shell radius and areal density between 0.002 and 2g/cm2. The energy-downshifted positron spectrum and angular scattering of the source particles are sufficient to constrain the conditions of the capsule between preshot and stagnation. Here, we evaluate the effects of magnetic fields near the capsule surface using analytic estimates where it is shown that this diagnostic can tolerate line integrated field strengths of 100 T mm.},
doi = {10.1063/1.5008426},
journal = {Physics of Plasmas},
number = 12,
volume = 24,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Cross sectional diagrams of modeled ICF capsules between pre-shot, implosion, and stagnation. Total DT mass is conserved for all cases while also increasing the fuel ρR by an order of magnitude at each step.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.