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:10.1103/physrevlett.127.055001

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

Journal Article · Wed Jul 28 04:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.055001· OSTI ID:1830368

^[1]; Betti, R. ^[2]; Forrest, C. J. ^[2]; Howard, J. ^[2]; Theobald, W. ^[2]; Delettrez, J. A. ^[2]; Rosenberg, M. J. ^[2]; Solodov, A. A. ^[2]; Stoeckl, C. ^[2]; Patel, D. ^[2]; Gopalaswamy, V. ^[2]; ^[2]; ^[2]; Edgell, D. H. ^[2]; Seka, W. ^[2]; ^[2]; ^[2]; ^[3]; Simpson, R. ^[3]; Regan, S. P. ^[2] more »

Univ. of Rochester, NY (United States); Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1830368

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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