Experimental characterization of hot-electron emission and shock dynamics in the context of the shock ignition approach to inertial confinement fusion

Tentori, A.; Colaitis, A.; Theobald, W.; Casner, A.; Raffestin, D.; Ruocco, A.; Trela, J.; Le Bel, E.; Anderson, K.; Wei, M.; Henderson, B.; Peebles, J.; Scott, R.; Baton, S.; Pikuz, S. A.; Betti, R.; Khan, M.; Woolsey, N.; Zhang, S.; Batani, D.

doi:10.1063/5.0059651

Experimental characterization of hot-electron emission and shock dynamics in the context of the shock ignition approach to inertial confinement fusion

Journal Article · Tue Oct 12 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0059651· OSTI ID:1830307

^[1]; ^[2]; Theobald, W. ^[3]; Casner, A. ^[2]; ^[2]; Ruocco, A. ^[4]; Trela, J. ^[2]; ^[2]; ^[3]; ^[3]; Henderson, B. ^[3]; ^[3]; ^[5]; ^[6]; Pikuz, S. A. ^[7]; Betti, R. ^[3]; ^[8]; ^[8]; Zhang, S. ^[9]; Batani, D. ^[2]

Univ. Bordeaux CEA-CNRS, Talence (France); Laboratory for Laser Energetics, University of Rochester
Univ. Bordeaux CEA-CNRS, Talence (France)
Univ. of Rochester, NY (United States)
Univ. Bordeaux CEA-CNRS, Talence (France); STFC Rutherford Appleton Lab., Oxford (United Kingdom)
STFC Rutherford Appleton Lab., Oxford (United Kingdom)
CNRS-Ecole Polytechnique-CEA-Sorbonne Univ., Palaiseau (France)
Joint Inst. for High Temperatures of Russian Academy of Sciences, Moscow (Russia)
Univ. of York (United Kingdom)
Univ. of California San Diego, La Jolla, CA (United States)

We report on planar target experiments conducted on the OMEGA-EP laser facility performed in the context of the shock ignition (SI) approach to inertial confinement fusion. The experiment aimed at characterizing the propagation of strong shock in matter and the generation of hot electrons (HEs), with laser parameters relevant to SI (1-ns UV laser beams with I ~10¹⁶ W/cm²). Time-resolved radiographs of the propagating shock front were performed in order to study the hydrodynamic evolution. The hot-electron source was characterized in terms of Maxwellian temperature, T_h, and laser to hot-electron energy conversion efficiency η using data from different x-ray spectrometers. The post-processing of these data gives a range of the possible values for T_h and η [i.e., T_h[keV] ϵ (20, 50) and η ϵ (2%, 13%)]. These values are used as input in hydrodynamic simulations to reproduce the results obtained in radiographs, thus constraining the range for the HE measurements. According to this procedure, we found that the laser converts ~10% ± 4% of energy into hot electrons with T_h = 27 ± 8 keV. The paper shows how the coupling of different diagnostics and numerical tools is required to sufficiently constrain the problem, solving the large ambiguity coming from the post-processing of spectrometers data. The effect of the hot electrons on the shock dynamics is then discussed, showing an increase in the pressure around the shock front. Furthermore, the low temperature found in this experiment without pre-compression laser pulses could be advantageous for the SI scheme, but the high conversion efficiency may lead to an increase in the shell adiabat, with detrimental effects on the implosion.

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:: 1830307

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Experimental characterization of hot-electron emission and shock dynamics in the context of the shock ignition approach to inertial confinement fusion

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