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Title: Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions

Abstract

Here, 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 3He-filled shock-driven inertial confinement fusion implosions. Two ion kinetic mechanisms are used to explain the anomalous observations: thermal decoupling of the D and 3He 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.

Authors:
 [1];  [1];  [1];  [2];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [3];  [3];  [4];  [4];  [4];  [4];  [4];  [5]
  1. MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Lab. for Laser Energetics, Rochester, NY (United States)
  5. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1172519
Alternate Identifier(s):
OSTI ID: 1181154; OSTI ID: 1256450
Report Number(s):
LLNL-JRNL-685666
Journal ID: ISSN 0031-9007; PRLTAO; ArticleNumber: 025001
Grant/Contract Number:  
NA0002035; NA0001857; B600100; 415023-G; 415935-G; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Rinderknecht, Hans G., Rosenberg, M. J., Li, C. K., Hoffman, N. M., Kagan, G., Zylstra, A. B., Sio, H., Johnson, M. Gatu, Seguin, F. H., Petrasso, R. D., Amendt, P., Bellei, C., Wilks, S., Delettrez, J., Glebov, V. Yu., Stoeckl, C., Sangster, T. C., Meyerhofer, D. D., and Nikroo, A. Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.025001.
Rinderknecht, Hans G., Rosenberg, M. J., Li, C. K., Hoffman, N. M., Kagan, G., Zylstra, A. B., Sio, H., Johnson, M. Gatu, Seguin, F. H., Petrasso, R. D., Amendt, P., Bellei, C., Wilks, S., Delettrez, J., Glebov, V. Yu., Stoeckl, C., Sangster, T. C., Meyerhofer, D. D., & Nikroo, A. Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions. United States. doi:10.1103/PhysRevLett.114.025001.
Rinderknecht, Hans G., Rosenberg, M. J., Li, C. K., Hoffman, N. M., Kagan, G., Zylstra, A. B., Sio, H., Johnson, M. Gatu, Seguin, F. H., Petrasso, R. D., Amendt, P., Bellei, C., Wilks, S., Delettrez, J., Glebov, V. Yu., Stoeckl, C., Sangster, T. C., Meyerhofer, D. D., and Nikroo, A. Wed . "Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions". United States. doi:10.1103/PhysRevLett.114.025001. https://www.osti.gov/servlets/purl/1172519.
@article{osti_1172519,
title = {Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions},
author = {Rinderknecht, Hans G. and Rosenberg, M. J. and Li, C. K. and Hoffman, N. M. and Kagan, G. and Zylstra, A. B. and Sio, H. and Johnson, M. Gatu and Seguin, F. H. and Petrasso, R. D. and Amendt, P. and Bellei, C. and Wilks, S. and Delettrez, J. and Glebov, V. Yu. and Stoeckl, C. and Sangster, T. C. and Meyerhofer, D. D. and Nikroo, A.},
abstractNote = {Here, 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 D3He-filled shock-driven inertial confinement fusion implosions. Two ion kinetic mechanisms are used to explain the anomalous observations: thermal decoupling of the D and 3He 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.},
doi = {10.1103/PhysRevLett.114.025001},
journal = {Physical Review Letters},
number = 2,
volume = 114,
place = {United States},
year = {2015},
month = {1}
}

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