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Title: Effects of magnetization on fusion product trapping and secondary neutron spectra

Abstract

In magnetizing the fusion fuel in inertial confinement fusion (ICF) systems, we found that the required stagnation pressure and density can be relaxed dramatically. This happens because the magnetic field insulates the hot fuel from the cold pusher and traps the charged fusion burn products. This trapping allows the burn products to deposit their energy in the fuel, facilitating plasma self-heating. Here, we report on a comprehensive theory of this trapping in a cylindrical DD plasma magnetized with a purely axial magnetic field. Using this theory, we are able to show that the secondary fusion reactions can be used to infer the magnetic field-radius product, BR, during fusion burn. This parameter, not ρR, is the primary confinement parameter in magnetized ICF. Using this method, we analyze data from recent Magnetized Liner InertialFusion experiments conducted on the Z machine at Sandia National Laboratories. Furthermore, we show that in these experiments BR ≈ 0.34(+0.14/-0.06) MG · cm, a ~ 14× increase in BR from the initial value, and confirming that the DD-fusion tritons are magnetized at stagnation. Lastly, this is the first experimental verification of charged burn product magnetization facilitated by compression of an initial seed magnetic flux.

Authors:
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+ Show Author Affiliations
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1185030
Report Number(s):
SAND-2014-20704J
Journal ID: ISSN 1070-664X; 553936
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 05; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; triton; neutrons; magnetic fields; plasma temperature; amorphous metals

Citation Formats

Knapp, Patrick F., Schmit, Paul F., Hansen, Stephanie B., Gomez, Matthew R., Hahn, Kelly D., Sinars, Daniel Brian, Peterson, Kyle J., Slutz, Stephen A., Sefkow, Adam B., Awe, Thomas James, Harding, Eric, Jennings, Christopher A., Desjarlais, M. P., Chandler, Gordon A., Cooper, Gary Wayne, Cuneo, Michael Edward, Geissel, Matthias, Harvey-Thompson, Adam James, Porter, John L., Rochau, Gregory A., Rovang, Dean C., Ruiz, Carlos L., Savage, Mark E., Smith, Ian C., Stygar, William A., and Herrmann, Mark. Effects of magnetization on fusion product trapping and secondary neutron spectra. United States: N. p., 2015. Web. doi:10.1063/1.4920948.
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Knapp, Patrick F., Schmit, Paul F., Hansen, Stephanie B., Gomez, Matthew R., Hahn, Kelly D., Sinars, Daniel Brian, Peterson, Kyle J., Slutz, Stephen A., Sefkow, Adam B., Awe, Thomas James, Harding, Eric, Jennings, Christopher A., Desjarlais, M. P., Chandler, Gordon A., Cooper, Gary Wayne, Cuneo, Michael Edward, Geissel, Matthias, Harvey-Thompson, Adam James, Porter, John L., Rochau, Gregory A., Rovang, Dean C., Ruiz, Carlos L., Savage, Mark E., Smith, Ian C., Stygar, William A., & Herrmann, Mark. Effects of magnetization on fusion product trapping and secondary neutron spectra. United States. https://doi.org/10.1063/1.4920948
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Knapp, Patrick F., Schmit, Paul F., Hansen, Stephanie B., Gomez, Matthew R., Hahn, Kelly D., Sinars, Daniel Brian, Peterson, Kyle J., Slutz, Stephen A., Sefkow, Adam B., Awe, Thomas James, Harding, Eric, Jennings, Christopher A., Desjarlais, M. P., Chandler, Gordon A., Cooper, Gary Wayne, Cuneo, Michael Edward, Geissel, Matthias, Harvey-Thompson, Adam James, Porter, John L., Rochau, Gregory A., Rovang, Dean C., Ruiz, Carlos L., Savage, Mark E., Smith, Ian C., Stygar, William A., and Herrmann, Mark. Thu . "Effects of magnetization on fusion product trapping and secondary neutron spectra". United States. https://doi.org/10.1063/1.4920948. https://www.osti.gov/servlets/purl/1185030.
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@article{osti_1185030,
title = {Effects of magnetization on fusion product trapping and secondary neutron spectra},
author = {Knapp, Patrick F. and Schmit, Paul F. and Hansen, Stephanie B. and Gomez, Matthew R. and Hahn, Kelly D. and Sinars, Daniel Brian and Peterson, Kyle J. and Slutz, Stephen A. and Sefkow, Adam B. and Awe, Thomas James and Harding, Eric and Jennings, Christopher A. and Desjarlais, M. P. and Chandler, Gordon A. and Cooper, Gary Wayne and Cuneo, Michael Edward and Geissel, Matthias and Harvey-Thompson, Adam James and Porter, John L. and Rochau, Gregory A. and Rovang, Dean C. and Ruiz, Carlos L. and Savage, Mark E. and Smith, Ian C. and Stygar, William A. and Herrmann, Mark},
abstractNote = {In magnetizing the fusion fuel in inertial confinement fusion (ICF) systems, we found that the required stagnation pressure and density can be relaxed dramatically. This happens because the magnetic field insulates the hot fuel from the cold pusher and traps the charged fusion burn products. This trapping allows the burn products to deposit their energy in the fuel, facilitating plasma self-heating. Here, we report on a comprehensive theory of this trapping in a cylindrical DD plasma magnetized with a purely axial magnetic field. Using this theory, we are able to show that the secondary fusion reactions can be used to infer the magnetic field-radius product, BR, during fusion burn. This parameter, not ρR, is the primary confinement parameter in magnetized ICF. Using this method, we analyze data from recent Magnetized Liner InertialFusion experiments conducted on the Z machine at Sandia National Laboratories. Furthermore, we show that in these experiments BR ≈ 0.34(+0.14/-0.06) MG · cm, a ~ 14× increase in BR from the initial value, and confirming that the DD-fusion tritons are magnetized at stagnation. Lastly, this is the first experimental verification of charged burn product magnetization facilitated by compression of an initial seed magnetic flux.},
doi = {10.1063/1.4920948},
journal = {Physics of Plasmas},
number = 05,
volume = 22,
place = {United States},
year = {Thu May 14 00:00:00 EDT 2015},
month = {Thu May 14 00:00:00 EDT 2015}
}
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https://doi.org/10.1063/1.4920948
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Works referenced in this record:

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    Works referencing / citing this record:

    Direct measurement of the inertial confinement time in a magnetically driven implosion
    journal, April 2017

    • Knapp, P. F.; Martin, M. R.; Dolan, D. H.
    • Physics of Plasmas, Vol. 24, Issue 4
    • DOI: 10.1063/1.4981206

    Average neutron time-of-flight instrument response function inferred from single D-T neutron events within a plastic scintillator
    journal, October 2018

    • Styron, J. D.; Ruiz, C. L.; Hahn, K. D.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5038883

    Origins and effects of mix on magnetized liner inertial fusion target performance
    journal, January 2019

    • Knapp, P. F.; Gomez, M. R.; Hansen, S. B.
    • Physics of Plasmas, Vol. 26, Issue 1
    • DOI: 10.1063/1.5064548

    Fusion-neutron measurements for magnetized liner inertial fusion experiments on the Z accelerator
    journal, May 2016

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