Effects of magnetization on fusion product trapping and secondary neutron spectra

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

doi:10.1063/1.4920948

Effects of magnetization on fusion product trapping and secondary neutron spectra

Journal Article · Thu May 14 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4920948· OSTI ID:1185030

Knapp, Patrick F. ^[1]; Schmit, Paul F. ^[1]; Hansen, Stephanie B. ^[1]; Gomez, Matthew R. ^[1]; Hahn, Kelly D. ^[1]; Sinars, Daniel Brian ^[1]; Peterson, Kyle J. ^[1]; Slutz, Stephen A. ^[1]; Sefkow, Adam B. ^[1]; Awe, Thomas James ^[1]; Harding, Eric ^[1]; Jennings, Christopher A. ^[1]; Desjarlais, M. P. ^[1]; Chandler, Gordon A. ^[1]; Cooper, Gary Wayne ^[1]; Cuneo, Michael Edward ^[1]; Geissel, Matthias ^[1]; Harvey-Thompson, Adam James ^[1]; Porter, John L. ^[1]; Rochau, Gregory A. ^[1] more »

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1185030

Alternate ID(s):: OSTI ID: 22410408

Report Number(s):: SAND--2014-20704J; 553936

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 05 Vol. 22; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Direct measurement of the inertial confinement time in a magnetically driven implosion Knapp, P. F.; Martin, M. R.; Dolan, D. H. Physics of Plasmas, Vol. 24, Issue 4 https://doi.org/10.1063/1.4981206	journal	April 2017
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Fusion-neutron measurements for magnetized liner inertial fusion experiments on the Z accelerator Hahn, K. D.; Chandler, G. A.; Ruiz, C. L. Journal of Physics: Conference Series, Vol. 717 https://doi.org/10.1088/1742-6596/717/1/012020	journal	May 2016

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