Correlations between asymmetric compression, burn amplification, and hot-spot velocities in inertial confinement fusion implosions

This manuscript examines the correlations between the hot-spot velocity (an observable signature of residual kinetic energy), low-mode implosion asymmetries, and burn amplification in inertial confinement fusion implosions on the National Ignition Facility (NIF). Using a combination of two-dimension...

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Veröffentlicht in:Physics of plasmas 2023-09, Vol.30 (9)
Hauptverfasser: Nora, R. C., Birge, N., Casey, D., Danly, C., Dewald, E. L., Djordjevic, B. Z., Do, A., Durocher, M., Field, J. E., Fittinghoff, D., Freeman, M. S., Gaffney, J., Geppert Kleinrath, V., Haan, S., Hahn, K., Hartouni, E., Hohenberger, M., Kerr, S., Landen, O. L., Milovich, J., Moore, A. S., Patel, P., Schlossberg, D. J., Sepke, S. M., Spears, B. K., Volegov, P. L., Wilde, C.
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Sprache:eng
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Zusammenfassung:This manuscript examines the correlations between the hot-spot velocity (an observable signature of residual kinetic energy), low-mode implosion asymmetries, and burn amplification in inertial confinement fusion implosions on the National Ignition Facility (NIF). Using a combination of two-dimensional axis-symmetric and three-dimensional radiation-hydrodynamic simulations coupled to neutronics, we find that for typical NIF implosions, the stagnation asymmetry multiplies the observed hot-spot velocity anywhere from 80% to 120%, while burn amplification always increases it. Additionally, we find stagnation asymmetry typically deflects the observed hot-spot flow. The two mechanisms (low-mode implosion asymmetries and burn amplification) can be decoupled, and application of a simple model to a database of cryogenic implosions on the NIF infers the total hot-spot velocity amplification. This finding modifies the interpretation of data collected from inertial confinement fusion experiments and impacts the magnitude and origin of low-mode asymmetries.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0153421