The physics of long- and intermediate-wavelength asymmetries of the hot spot: Compression hydrodynamics and energetics

Bose, A.; Betti, R.; Shvarts, D.; Woo, K. M.

doi:10.1063/1.4995250

The physics of long- and intermediate-wavelength asymmetries of the hot spot: Compression hydrodynamics and energetics

Journal Article · Tue Oct 03 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4995250· OSTI ID:1405332

^[1]; Betti, R. ^[2]; Shvarts, D. ^[3]; Woo, K. M. ^[2]

Univ. of Rochester, Rochester, NY (United States); Univ. of Michigan, Ann Arbor, MI (United States); Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, Rochester, NY (United States)
Univ. of Michigan, Ann Arbor, MI (United States); NRCN, Beer Sheva (Israel)

To achieve ignition with inertial confinement fusion (ICF), it is important to under- stand the effect of asymmetries on the hydrodynamics and energetics of the compres- sion. This paper describes a theoretical model for the compression of distorted hot spots, and quantitative estimates using hydrodynamic simulations. The asymmetries are categorized into low (Ι < 6) and intermediate (Ι < A < 40) modes by comparison of the wavelength with the thermal-diffusion scale length. Long-wavelength modes introduce substantial nonradial motion, whereas intermediate-wavelength modes in- volve more cooling by thermal ablation. We discover that for distorted hot spots, the measured neutron-averaged properties can be very different from the real hydro- dynamic conditions. This is because mass ablation driven my thermal conduction introduces flows in the Rayleigh–Taylor bubbles, this results in pressure variation, in addition to temperature variation between the bubbles and the neutron-producing region (~1 keV for intermediate modes). The differences are less pronounced for long-wavelength asymmetries since the bubbles are relatively hot and sustain fusion reactions. The yield degradation$$-$$ with respect to the symmetric$$-$$ results primarily from a reduction in the hot-spot pressure for low modes and from a reduction in burn volume for intermediate modes. It is shown that the degradation in internal energy of the hot-spot is equivalent for both categories, and is equal to the total residual energy in the shell including the bubbles. This quantity is correlated with the shell residual kinetic energy for low-modes, and includes the kinetic energy in the bubbles for mid-modes.

View Accepted Manuscript (DOE)

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

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

Contributing Organization:: Laboratory for Laser Energetics, University of Rochester

Grant/Contract Number:: FC02-04ER54789; NA0001944

OSTI ID:: 1405332

Alternate ID(s):: OSTI ID: 1396067

Report Number(s):: 2016-260, 1358; 2016-260, 2316, 1358

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 24; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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A simulation-based model for understanding the time dependent x-ray drive asymmetries and error bars in indirectly driven implosions on the National Ignition Facility Masse, L.; Clark, D.; MacLaren, S. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5092827	journal	June 2019
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