Hydrodynamic scaling of the deceleration-phase Rayleigh–Taylor instability

Bose, A.; Woo, K. M.; Nora, R.; Betti, R.

doi:10.1063/1.4923438

Title: Hydrodynamic scaling of the deceleration-phase Rayleigh–Taylor instability

Journal Article · Thu Jul 02 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4923438· OSTI ID:1197482

Bose, A. ^[1]; Woo, K. M. ^[1]; Nora, R. ^[2]; Betti, R. ^[1]

Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics, Dept. of Physics and Fusion Science Center.
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The scaling of the deceleration phase of inertial fusion direct-drive implosions is investigated for OMEGA and National Ignition Facility (NIF)-size targets. It is shown that the deceleration-phase Rayleigh–Taylor instability (RTI) does not scale hydro-equivalently with implosion size. This is because ablative stabilization resulting from thermal conduction and radiation transport in a spherically converging geometry is different on the two scales. As a consequence, NIF-scale implosions show lower hot-spot density and mass ablation velocity, allowing for higher RTI growth. On the contrary, stabilization resulting from density-gradient enhancement, caused by reabsorption of radiation emitted from the hot spot, is higher on NIF implosions. Since the RTI mitigation related to thermal conduction and radiation transport scale oppositely with implosion size, the degradation of implosion performance caused by the deceleration RTI is similar for NIF and OMEGA targets. It is found that a minimum threshold for the no-α Lawson ignition parameter of ΧΩ ≈ 0.2 at the OMEGA scale is required to demonstrate hydro-equivalent ignition at the NIF scale for symmetric direct-drive implosions.

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

Sponsoring Organization:: USDOE

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

OSTI ID:: 1197482

Alternate ID(s):: OSTI ID: 1228655

Report Number(s):: DOE-LLE-1944-1230; PHPAEN; 2015-1; 2195; TIC-1230

Journal Information:: Physics of Plasmas, Vol. 22, Issue 7; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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References (24)

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The physics of long- and intermediate-wavelength asymmetries of the hot spot: Compression hydrodynamics and energetics Bose, A.; Betti, R.; Shvarts, D. Physics of Plasmas, Vol. 24, Issue 10 https://doi.org/10.1063/1.4995250	journal	October 2017
Ablative stabilization of Rayleigh-Taylor instabilities resulting from a laser-driven radiative shock Huntington, C. M.; Shimony, A.; Trantham, M. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5022179	journal	May 2018
Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA Bose, A.; Betti, R.; Mangino, D. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5026780	journal	June 2018
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