Measurement of hydrodynamic instability growth during the deceleration of an inertial confinement fusion implosion

This paper presents an exploration of potential mitigation methods for the gas fuel fill tube in Inertial Confinement Fusion (ICF) implosions at the National Ignition Facility (NIF), and the impact of hydrodynamic growth seeded from other target imperfections using a specialized low convergence impl...

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Bibliographic Details
Published in:	High energy density physics Vol. 37; p. 100817
Main Authors:	Pickworth, L.A., Smalyuk, V.A., Hammel, B.A., Weber, C., Clark, D.S., Robey, H.F., MacPhee, A.G., Pape, S. Le, Casey, D.T., Berzak-Hopkins, L., Zylstra, A., Kritcher, A., Walters, C.F., Bhandarkar, S.D., Stadermann, M., Johnson, S., Diaz, S., Ratledge, M., Alfonso, N., Landen, O.N., Pak, A.E., Izumi, N., Khan, S.F., Benedetti, L.R., Lahmann, B., Hartouni, E.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-11-2020
Subjects:	Ablation front growth Indirect Drive Inertial Confinement Fusion Unstable Hydrodynamics X-ray self-emission imaging Ablation front growth Inertial Confinement Fusion X-ray self-emission imaging Unstable Hydrodynamics Indirect Drive
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Summary:	This paper presents an exploration of potential mitigation methods for the gas fuel fill tube in Inertial Confinement Fusion (ICF) implosions at the National Ignition Facility (NIF), and the impact of hydrodynamic growth seeded from other target imperfections using a specialized low convergence implosion experiment. Enhanced x-ray self- emission of this experiment design allows the impact of hydrodynamic growth through the deceleration phase of the implosion to be examined. Experiments are presented comparing the perturbation visible during the implosion deceleration that are seeded by the fill tube, through varying the initial geometry in otherwise similar implosions. We further extend the experiment to explore the impact of isolated high atomic number 'dots' of 5 and 20 µm diameter. These isolated dots are compared in two different ‘High Density Carbon’ ablator designs in a gold hohlraum. The experiment series finds a correlation to number of high frequency self-emission features observed in deceleration and degradation in total Deuterium-Deuterium neutron yield.
ISSN:	1574-1818 1878-0563
DOI:	10.1016/j.hedp.2020.100817