Hybrid target design for imprint mitigation in direct-drive inertial confinement fusion

Physical Review. E
L CeurvorstW Theobald

Abstract

A target design for mitigating the Rayleigh-Taylor instability is proposed for use in high energy density and direct-drive inertial confinement fusion experiments. In this scheme, a thin gold membrane is offset from the main target by several-hundred microns. A strong picket on the drive beams is incident upon this membrane to produce x rays which generate the initial shock through the target. The main drive follows shortly thereafter, passing through the ablated shell and directly driving the main target. The efficacy of this scheme is demonstrated through experiments performed at the OMEGA EP facility, showing a reduction of the Rayleigh-Taylor instability growth which scales exponentially with frequency, suppressing development by at least a factor of 5 for all wavelengths below 100 μm. This results in a delay in the time of target perforation by ∼40%.

References

Aug 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·A BenuzziD Pepler
Aug 13, 2013·Physical Review Letters·S P ReganR P J Town
Mar 15, 2015·Physical Review Letters·Max KarasikS P Obenschain

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Citations

Dec 8, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Peter A NorreysGeorge Tynan
Dec 8, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·A Casner

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