Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion

Christopherson, A. R.; Betti, R.; Forrest, C. J.; Howard, J.; Theobald, W.; Delettrez, J. A.; Rosenberg, M. J.; Solodov, A. A.; Stoeckl, C.; Patel, D.; Gopalaswamy, V.; Cao, D.; Peebles, J. L.; Edgell, D. H.; Seka, W.; Epstein, R.; Wei, M. S.; Gatu Johnson, M.; Simpson, R.; Regan, S. P.; Campbell, E. M.

doi:10.7910/DVN/PEH7OP

Title: Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion

Abstract

Hot electrons generated by laser-plasma instabilities degrade the performance of laser-fusion implosions by preheating the DT fuel and reducing core compression. The hot-electron energy deposition in the DT fuel has been directly measured for the first time by comparing the hard x-ray signals between DT-layered and mass-equivalent ablator-only implosions. The electron energy deposition profile in the fuel is inferred through dedicated experiments using Cu-doped payloads of varying thickness. The measured preheat energy accurately explains the areal-density degradation observed in many OMEGA implosions. This technique can be used to assess the viability of the direct-drive approach to laser fusion with respect to the scaling of hot-electron preheat with laser energy.

Publication Date:: 2022-06-09

DOE Contract Number:: NA0003856

Research Org.:: Univ. of Rochester, NY (United States)

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

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1889453

DOI:: https://doi.org/10.7910/DVN/PEH7OP

Citation Formats


                    Christopherson, A. R., Betti, R., Forrest, C. J., Howard, J., Theobald, W., Delettrez, J. A., Rosenberg, M. J., Solodov, A. A., Stoeckl, C., Patel, D., Gopalaswamy, V., Cao, D., Peebles, J. L., Edgell, D. H., Seka, W., Epstein, R., Wei, M. S., Gatu Johnson, M., Simpson, R., Regan, S. P., and Campbell, E. M. Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion.  United States: N. p., 2022. 
        Web.  doi:10.7910/DVN/PEH7OP.

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                    Christopherson, A. R., Betti, R., Forrest, C. J., Howard, J., Theobald, W., Delettrez, J. A., Rosenberg, M. J., Solodov, A. A., Stoeckl, C., Patel, D., Gopalaswamy, V., Cao, D., Peebles, J. L., Edgell, D. H., Seka, W., Epstein, R., Wei, M. S., Gatu Johnson, M., Simpson, R., Regan, S. P., & Campbell, E. M. Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion.  United States.  doi:https://doi.org/10.7910/DVN/PEH7OP

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                    Christopherson, A. R., Betti, R., Forrest, C. J., Howard, J., Theobald, W., Delettrez, J. A., Rosenberg, M. J., Solodov, A. A., Stoeckl, C., Patel, D., Gopalaswamy, V., Cao, D., Peebles, J. L., Edgell, D. H., Seka, W., Epstein, R., Wei, M. S., Gatu Johnson, M., Simpson, R., Regan, S. P., and Campbell, E. M. 2022.  
"Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion".  United States.  doi:https://doi.org/10.7910/DVN/PEH7OP.  https://www.osti.gov/servlets/purl/1889453. Pub date:Thu Jun 09 00:00:00 EDT 2022

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@article{osti_1889453,

  title        = {Direct Measurements of DT Fuel Preheat from Hot Electrons in Direct-Drive Inertial Confinement Fusion},

  author       = {Christopherson, A. R. and Betti, R. and Forrest, C. J. and Howard, J. and Theobald, W. and Delettrez, J. A. and Rosenberg, M. J. and Solodov, A. A. and Stoeckl, C. and Patel, D. and Gopalaswamy, V. and Cao, D. and Peebles, J. L. and Edgell, D. H. and Seka, W. and Epstein, R. and Wei, M. S. and Gatu Johnson, M. and Simpson, R. and Regan, S. P. and Campbell, E. M.},

  abstractNote = {Hot electrons generated by laser-plasma instabilities degrade the performance of laser-fusion implosions by preheating the DT fuel and reducing core compression. The hot-electron energy deposition in the DT fuel has been directly measured for the first time by comparing the hard x-ray signals between DT-layered and mass-equivalent ablator-only implosions. The electron energy deposition profile in the fuel is inferred through dedicated experiments using Cu-doped payloads of varying thickness. The measured preheat energy accurately explains the areal-density degradation observed in many OMEGA implosions. This technique can be used to assess the viability of the direct-drive approach to laser fusion with respect to the scaling of hot-electron preheat with laser energy.},

  doi          = {10.7910/DVN/PEH7OP},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2022},

  month        = {6}

}

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