Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions
Name
PhysRevLett.114.025001.pdf
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826.69 KB
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Checksum (MD5)
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Author(s)
Rosenberg, M. J.
Hoffman, N. M.
Kagan, Grigory Alexandrovich
Amendt, P.
Bellei, C.
Wilks, S.
Delettrez, J. A.
Glebov, V. Yu.
Stoeckl, C.
Sangster, T. C.
Date Issued
January 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Rinderknecht, Hans G., et al. "Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions." Phys. Rev. Lett. 114, 025001 (January 2015). © 2015 American Physical Society
Version
Final published version
Abstract
Anomalous reduction of the fusion yields by 50% and anomalous scaling of the burn-averaged ion temperatures with the ion-species fraction has been observed for the first time in D[superscript 3]He-filled shock-driven inertial confinement fusion implosions. Two ion kinetic mechanisms are used to explain the anomalous observations: thermal decoupling of the D and [superscript 3]He populations and diffusive species separation. The observed insensitivity of ion temperature to a varying deuterium fraction is shown to be a signature of ion thermal decoupling in shock-heated plasmas. The burn-averaged deuterium fraction calculated from the experimental data demonstrates a reduction in the average core deuterium density, as predicted by simulations that use a diffusion model. Accounting for each of these effects in simulations reproduces the observed yield trends.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.114.025001
