Compensating cylindrical Hohlraum mode 4 asymmetry via capsule thickness tailoring and effects on implosions

Dewald, E. L.; Clark, D. S.; Casey, D. T.; Khan, S. F.; Mariscal, D.; Nicola, P. Di; MacGowan, B. J.; Hartouni, E. P.; Rubery, M. S.; Choate, C.; Nikroo, A.; Smalyuk, V. A.; Landen, O. L.; Ratledge, M.; Fitzsimmons, P.; Farrell, M.; Mauldin, M.; Rice, N.

doi:10.1063/5.0100095

Compensating cylindrical Hohlraum mode 4 asymmetry via capsule thickness tailoring and effects on implosions

Journal Article · Wed Sep 14 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0100095· OSTI ID:1902000

^[1]; ^[1]; ^[1]; ^[1]; ^[1]; Nicola, P. Di ^[1]; MacGowan, B. J. ^[1]; ^[1]; ^[1]; Choate, C. ^[1]; ^[1]; ^[1]; ^[1]; Ratledge, M. ^[2]; Fitzsimmons, P. ^[2]; ^[2]; Mauldin, M. ^[2]; Rice, N. ^[2]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

We report previously, hydrodynamic simulations suggested that precisely tailoring the capsule ablator thickness (shimming) could counterbalance cylindrical Hohlraum Legendre P₄ drive asymmetries at the capsule in laser indirect drive implosions. As a result, the stagnated deuterium–tritium (DT) fuel areal density P₄ asymmetry is reduced, potentially resulting in a nuclear yield increase. Inflight radiographs of various level of shimmed capsules with plastic (CH) ablators showed that shims can indeed control the in-flight capsule shell P₄ asymmetry, with a linear sensitivity to shim amplitude that is close to analytic estimates and simulations. Furthermore, the stagnated DT fuel areal density P₄ asymmetry inferred from downscattered neutron imaging was reduced when the capsule shim was applied, in agreement with simulations matching the inflight shell asymmetry. A nuclear yield improvement via shim was not observed, as predicted, likely due to implosion instabilities and as built capsule shim deviations from an ideal P₄ shape.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1902000

Alternate ID(s):: OSTI ID: 1887334

Report Number(s):: LLNL-JRNL-835426; 1054387

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 29; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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