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Title: Direct-drive DT implosions with Knudsen number variations

Abstract

Direct-drive implosions of DT-filled plastic-shells have been conducted at the Omega laser facility, measuring nuclear yields while varying Knudsen numbers (i.e., the ratio of mean free path of fusing ions to the length of fuel region) by adjusting both shell thickness (e.g., 7.5, 15, 20, 30 μm) and fill pressure (e.g., 2, 5, 15 atm). In addition, the fusion reactivity reduction model showed a stronger effect on yield as the Knudsen number increases (or the shell thickness decreases). The Reduced-Ion-Kinetic (RIK) simulation which includes both fusion reactivity reduction and mix model was necessary to provide a better match between the observed neutron yields and those simulated.

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [1];  [2];  [2];  [2];  [2];  [3];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Atomic Weapons Establishment (United Kingdom)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Laboratory for Laser Energetics, Rochester, NY (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1337088
Report Number(s):
LA-UR-15-29134
Journal ID: ISSN 1742-6588
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 717; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Kim, Yong Ho, Herrmann, Hans W., Hoffman, Nelson M., Schmitt, Mark J., Bradley, P.aul Andrew, Gales, Steve, Horsfield, Colin J., Rubery, Mike, Leatherland, Alex, Johnson, Maria Gatu, Frenje, J. A., and Glebov, V. Yu. Direct-drive DT implosions with Knudsen number variations. United States: N. p., 2016. Web. https://doi.org/10.1088/1742-6596/717/1/012030.
Kim, Yong Ho, Herrmann, Hans W., Hoffman, Nelson M., Schmitt, Mark J., Bradley, P.aul Andrew, Gales, Steve, Horsfield, Colin J., Rubery, Mike, Leatherland, Alex, Johnson, Maria Gatu, Frenje, J. A., & Glebov, V. Yu. Direct-drive DT implosions with Knudsen number variations. United States. https://doi.org/10.1088/1742-6596/717/1/012030
Kim, Yong Ho, Herrmann, Hans W., Hoffman, Nelson M., Schmitt, Mark J., Bradley, P.aul Andrew, Gales, Steve, Horsfield, Colin J., Rubery, Mike, Leatherland, Alex, Johnson, Maria Gatu, Frenje, J. A., and Glebov, V. Yu. Thu . "Direct-drive DT implosions with Knudsen number variations". United States. https://doi.org/10.1088/1742-6596/717/1/012030. https://www.osti.gov/servlets/purl/1337088.
@article{osti_1337088,
title = {Direct-drive DT implosions with Knudsen number variations},
author = {Kim, Yong Ho and Herrmann, Hans W. and Hoffman, Nelson M. and Schmitt, Mark J. and Bradley, P.aul Andrew and Gales, Steve and Horsfield, Colin J. and Rubery, Mike and Leatherland, Alex and Johnson, Maria Gatu and Frenje, J. A. and Glebov, V. Yu},
abstractNote = {Direct-drive implosions of DT-filled plastic-shells have been conducted at the Omega laser facility, measuring nuclear yields while varying Knudsen numbers (i.e., the ratio of mean free path of fusing ions to the length of fuel region) by adjusting both shell thickness (e.g., 7.5, 15, 20, 30 μm) and fill pressure (e.g., 2, 5, 15 atm). In addition, the fusion reactivity reduction model showed a stronger effect on yield as the Knudsen number increases (or the shell thickness decreases). The Reduced-Ion-Kinetic (RIK) simulation which includes both fusion reactivity reduction and mix model was necessary to provide a better match between the observed neutron yields and those simulated.},
doi = {10.1088/1742-6596/717/1/012030},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 717,
place = {United States},
year = {2016},
month = {5}
}

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Works referenced in this record:

Knudsen Layer Reduction of Fusion Reactivity
journal, August 2012


Revised Knudsen-layer reduction of fusion reactivity
journal, December 2013

  • Albright, B. J.; Molvig, Kim; Huang, C. -K.
  • Physics of Plasmas, Vol. 20, Issue 12
  • DOI: 10.1063/1.4833639

Approximate models for the ion-kinetic regime in inertial-confinement-fusion capsule implosions
journal, May 2015

  • Hoffman, Nelson M.; Zimmerman, George B.; Molvig, Kim
  • Physics of Plasmas, Vol. 22, Issue 5
  • DOI: 10.1063/1.4921130

Self-Similar Structure and Experimental Signatures of Suprathermal Ion Distribution in Inertial Confinement Fusion Implosions
journal, September 2015


Thermo-diffusion in inertially confined plasmas
journal, April 2014


    Works referencing / citing this record:

    Diffusion-dominated mixing in moderate convergence implosions
    journal, June 2018