Inferences of hot electron preheat and its spatial distribution in OMEGA direct drive implosions

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

doi:10.1063/5.0091220

Inferences of hot electron preheat and its spatial distribution in OMEGA direct drive implosions

Journal Article · Tue Dec 13 04:00:00 EST 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0091220· OSTI ID:1903405

; Betti, R.; ; ; ; ; Delettrez, J.; ; ; ; Patel, D.; ; ; ; ; Seka, W.; ; Scullin, W.; ; more »

Hot electrons generated from laser plasma instabilities degrade performance of direct drive implosions by preheating the deuterium and tritium (DT) fuel resulting in early decompression and lower areal densities at stagnation. A technique to quantify the hot electron preheat of the dense DT fuel and connect it to the degradation in areal density is described in detail. Hot electrons are measured primarily from the hard x-rays they emit as they slow down in the target. The DT preheat is inferred from a comparison of the hard x-ray signals between a DT-layered implosion and its mass equivalent ablator only implosion. The preheat energy spatial distribution within the imploding shell is inferred from experiments using high Z payloads of varying thicknesses. It is found that the electrons deposit their energy uniformly throughout the shell material. For typical direct-drive OMEGA implosions driven with an overlapped intensity of ∼9·1014 W/cm2, approximately ∼0.02%–0.03% of the laser energy is converted into preheat of the stagnated fuel which corresponds to areal density degradations of 10%–20%. The degradations in areal density explain some of the observed discrepancies between the simulated and measured areal densities.

View Accepted Manuscript (Publisher)

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1903405

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 29; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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