Correlating hot-electron preheat from the two-plasmon decay instability to $ρR$ degradation for direct-drive implosions on OMEGA

Cao, D.; Theobald, W.; Rosenberg, M. J.; Ceurvorst, L.; Patel, D.; Christopherson, A. R.; Stoeckl, C.; Lees, A.; Gopalaswamy, V.; Betti, R.; Forrest, C.; Churnetski, K.; Regan, S. P.; Bahukutumbi, R. P.; Collins, T. J. B.; Goncharov, V.

doi:10.1063/5.0281270

Correlating hot-electron preheat from the two-plasmon decay instability to $ρR$ degradation for direct-drive implosions on OMEGA

Journal Article · Tue Sep 09 00:00:00 EDT 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0281270· OSTI ID:2997984

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University of Rochester, NY (United States)
University of Rochester, NY (United States); Focused Energy Inc., San Francisco, CA (United States)
University of Rochester, NY (United States); Xcimer Energy, Denver, CO (United States)
University of Rochester, NY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Focused experiments were performed with the goal of isolating the impact of hot-electron preheat on compression in deuterium–tritium (DT) layered, direct-drive implosions on OMEGA. Preheat from the hot-electrons generated by two-plasmon–decay (TPD) activity was varied through the incident laser intensity, with the total preheat energy deposited into unablated DT fuel being inferred using hard x-ray measurements. Results show a clear correlation between the inferred preheat levels and $ρR$ degradation that is consistent with a derived, 1D preheat model. A fit to the results also provides an estimated range of $ρR$ degradation from non-preheat sources for the adiabat ≈5 implosions used in this study. A follow-up study using targets containing Si-doped (5.5%) CH ablators (CHSi) demonstrated results consistent with mid-Z dopants mitigating TPD activity by showing these targets had almost no $ρR$ degradation as the laser intensity was increased up to levels previously considered damaging.

View Accepted Manuscript (DOE)

Research Organization:: University of Rochester, NY (United States)

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

Grant/Contract Number:: NA0004144

OSTI ID:: 2997984

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 32; ISSN 1070-664X; ISSN 1089-7674

Publisher:: AIP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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