Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive

MacPhee, A. G.; Peterson, J. L.; Casey, D. T.; Clark, D. S.; Haan, S. W.; Jones, O. S.; Landen, O. L.; Milovich, J. L.; Robey, H. F.; Smalyuk, V. A.

doi:10.1063/1.4928909

Title: Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive

Journal Article · Sat Aug 01 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4928909· OSTI ID:1234625

^[1];

^[1]; Casey, D. T. ^[1];

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^[1]; Jones, O. S. ^[1]; Landen, O. L. ^[1]; Milovich, J. L. ^[1]; Robey, H. F. ^[1]; Smalyuk, V. A. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Hydrodynamic instabilities and poor fuel compression are major factors for capsule performance degradation in ignition experiments on the National Ignition Facility. Using a recently developed laser drive profile with a decaying first shock to tune the ablative Richtmyer-Meshkov (ARM) instability and subsequent in-flight Rayleigh-Taylor growth, we have demonstrated reduced growth compared to the standard ignition pulse whilst maintaining conditions for a low fuel adiabat needed for increased compression. Here, using in-flight x-ray radiography of pre-machined modulations, the first growth measurements using this new ARM-tuned drive have demonstrated instability growth reduction of ~4× compared to the original design at a convergence ratio of ~2. Corresponding simulations give a fuel adiabat of ~1.6, similar to the original goal and consistent with ignition requirements.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1234625

Alternate ID(s):: OSTI ID: 1229620

Report Number(s):: LLNL-JRNL-669426

Journal Information:: Physics of Plasmas, Vol. 22, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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