Impact of asymmetries on fuel performance in Inertial Confinement Fusion

Johnson, M. Gatu; Appelbe, B. D.; Chittenden, J. P.; Delettrez, J.; Forrest, C.; Frenje, J. A.; Glebov, V. Yu.; Grimble, W.; Haines, B. M.; Igumenshchev, I.; Janezic, R.; Knauer, J. P.; Lahmann, B.; Marshall, F.; Michel, T.; Séguin, F. H.; Stoeckl, C.; Walsh, C.; Zylstra, A. B.; Petrasso, R. D.

doi:10.7910/DVN/COHAXG

Title: Impact of asymmetries on fuel performance in Inertial Confinement Fusion

Abstract

Low-mode asymmetries prevent effective compression, confinement and heating of the fuel in inertial confinement fusion (ICF) implosions and their control is essential to achieving ignition. Ion temperatures (Tion) in ICF experiments are inferred from the broadening of primary neutron spectra. Directional motion (flow) of the fuel at burn also impacts broadening and will lead to artificially inflated “Tion” values. Flow due to low-mode asymmetries is expected to give rise to line-of-sight variations in measured Tion. We report on intentionally asymmetrically driven experiments at the OMEGA laser facility designed to test the ability to accurately predict and measure line-of-sight differences in apparent Tion due to low-mode asymmetry-seeded flows. Contrasted to Chimera and xRAGE simulations, the measurements demonstrate how all asymmetry seeds have to be considered to fully capture the flow field in an implosion. In particular, flow induced by the stalk that holds the target is found to interfere with the seeded asymmetry. A substantial stalk-seeded asymmetry in the areal density of the implosion is also observed.

Publication Date:: 2018-12-06

DOE Contract Number:: NA0002949; NA0002726; AC52-06NA25396

Research Org.:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1880510

DOI:: https://doi.org/10.7910/DVN/COHAXG

Citation Formats


                    Johnson, M. Gatu, Appelbe, B. D., Chittenden, J. P., Delettrez, J., Forrest, C., Frenje, J. A., Glebov, V. Yu., Grimble, W., Haines, B. M., Igumenshchev, I., Janezic, R., Knauer, J. P., Lahmann, B., Marshall, F., Michel, T., Séguin, F. H., Stoeckl, C., Walsh, C., Zylstra, A. B., and Petrasso, R. D. Impact of asymmetries on fuel performance in Inertial Confinement Fusion.  United States: N. p., 2018. 
        Web.  doi:10.7910/DVN/COHAXG.

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                    Johnson, M. Gatu, Appelbe, B. D., Chittenden, J. P., Delettrez, J., Forrest, C., Frenje, J. A., Glebov, V. Yu., Grimble, W., Haines, B. M., Igumenshchev, I., Janezic, R., Knauer, J. P., Lahmann, B., Marshall, F., Michel, T., Séguin, F. H., Stoeckl, C., Walsh, C., Zylstra, A. B., & Petrasso, R. D. Impact of asymmetries on fuel performance in Inertial Confinement Fusion.  United States.  doi:https://doi.org/10.7910/DVN/COHAXG

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                    Johnson, M. Gatu, Appelbe, B. D., Chittenden, J. P., Delettrez, J., Forrest, C., Frenje, J. A., Glebov, V. Yu., Grimble, W., Haines, B. M., Igumenshchev, I., Janezic, R., Knauer, J. P., Lahmann, B., Marshall, F., Michel, T., Séguin, F. H., Stoeckl, C., Walsh, C., Zylstra, A. B., and Petrasso, R. D. 2018.  
"Impact of asymmetries on fuel performance in Inertial Confinement Fusion".  United States.  doi:https://doi.org/10.7910/DVN/COHAXG.  https://www.osti.gov/servlets/purl/1880510. Pub date:Thu Dec 06 00:00:00 EST 2018

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@article{osti_1880510,

  title        = {Impact of asymmetries on fuel performance in Inertial Confinement Fusion},

  author       = {Johnson, M. Gatu and Appelbe, B. D. and Chittenden, J. P. and Delettrez, J. and Forrest, C. and Frenje, J. A. and Glebov, V. Yu. and Grimble, W. and Haines, B. M. and Igumenshchev, I. and Janezic, R. and Knauer, J. P. and Lahmann, B. and Marshall, F. and Michel, T. and Séguin, F. H. and Stoeckl, C. and Walsh, C. and Zylstra, A. B. and Petrasso, R. D.},

  abstractNote = {Low-mode asymmetries prevent effective compression, confinement and heating of the fuel in inertial confinement fusion (ICF) implosions and their control is essential to achieving ignition. Ion temperatures (Tion) in ICF experiments are inferred from the broadening of primary neutron spectra. Directional motion (flow) of the fuel at burn also impacts broadening and will lead to artificially inflated “Tion” values. Flow due to low-mode asymmetries is expected to give rise to line-of-sight variations in measured Tion. We report on intentionally asymmetrically driven experiments at the OMEGA laser facility designed to test the ability to accurately predict and measure line-of-sight differences in apparent Tion due to low-mode asymmetry-seeded flows. Contrasted to Chimera and xRAGE simulations, the measurements demonstrate how all asymmetry seeds have to be considered to fully capture the flow field in an implosion. In particular, flow induced by the stalk that holds the target is found to interfere with the seeded asymmetry. A substantial stalk-seeded asymmetry in the areal density of the implosion is also observed.},

  doi          = {10.7910/DVN/COHAXG},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2018},

  month        = {12}

}

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