Title: Mechanisms of shape transfer and preheating in indirect-drive double shell collisions

Abstract

Implosions of Hohlraum-driven double shell targets as an alternative inertial confinement fusion concept are underway at the National Ignition Facility. The double shell system relies on a series of energy transfer processes starting from thermal x-ray absorption by the outer shell, followed by collisional transfer of kinetic energy to a heavy metal inner shell, and finally, conversion to the internal energy of the deuterium-tritium fuel. During each of these energy transfer stages, low-mode asymmetries can act to reduce the ideal transfer efficiency degrading double shell performance. Mechanisms, such as hard x-ray preheat from the Hohlraum, not only decrease the efficiency of kinetic energy transfer but may also be a source of low-mode asymmetry. In this article, we evaluate the shape transfer processes through the time of shell collision using two-dimensional integrated Hohlraum and capsule computations. We find that the dominant mode of the shape transfer is well described using a “radial impulse” model from the shape of the foam pressure reservoir. To evaluate the importance of preheat on inner shell shape, we also report on first measurements of Au L-shell preheat asymmetry in a double shell with a tungsten pusher. These measurements showed a 65% higher preheat velocity at themore » pole of the capsule relative to the equator. We also found that the experiments provided rigorous constraints by which to test the Hohlraum model settings that impact the amount and symmetry of Au L-shell preheat via the plasma conditions inside the outer cone Au bubble.« less

Authors:

Loomis, Eric Nicholas  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-2095-1383"

Robey, III, Harry F.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-5169-8283"

Haines, Brian Michael  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-3889-7074"

Morrow, Tana  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-3994-4194"

Montgomery, David S.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-2355-6242"

Wilson, Douglas Carl  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-1823-1013"

Xu, Hongwei ^[2]; Millot, Marius  ^[3];

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• Search DOE PAGES for ORCID "0000-0003-4414-3532"

Celliers, Peter  ^[3];

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• Search DOE PAGES for ORCID "0000-0001-7600-1227"

Sacks, Ryan Foster  ^[1];

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Sauppe, Joshua Paul  ^[1];

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Quintana, Theresa E. ^[1]; Heinbockel, Chuck  ^[2];

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• Search DOE PAGES for ORCID "0000-0003-2257-5342"

Kroll, Jeremy ^[3]; Randolph, Blaine Randall ^[1]; Fierro, Franklin ^[1]; Wilson, Christopher Talker  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-1011-9649"

Daughton, William Scott  ^[1];

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Merritt, Elizabeth Catherine  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-9026-0070"

Finnegan, Sean Michael  ^[1]

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more »; Kot, Lynn  ^[1];

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Keiter, Paul Arthur  ^[1];

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Sagert, Irina  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-1487-0360"

Stark, David James  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-0364-2733"

Amendt, Peter  ^[3];

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• Search DOE PAGES for ORCID "0000-0001-7402-1777"

Ping, Yuan  ^[3];

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• Search DOE PAGES for ORCID "0000-0002-4879-9072"

Smalyuk, Vladimir A. ^[3]; Patel, Mehul V.  ^[3];

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• Search DOE PAGES for ORCID "0000-0002-0486-010X"

Salmonson, Jay D. ^[3] « less

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+ Show Author Affiliations

1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. General Atomics, San Diego, CA (United States)
3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:

Wed Jun 01 00:00:00 EDT 2022

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1883020

Alternate Identifier(s):

OSTI ID: 1870931; OSTI ID: 1872357

Report Number(s):

LLNL-JRNL-829726; LA-UR-21-32041
Journal ID: ISSN 1070-664X; 1045521; TRN: US2307960

Grant/Contract Number:  

AC52-07NA27344; 89233218CNA000001; 89233218CNA000063

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Plasmas

Additional Journal Information:

Journal Volume: 29; Journal Issue: 6; Journal ID: ISSN 1070-664X

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma confinement; shock waves; high-energy x-rays; hard x-rays; lasers; nuclear fuel; thermal radiation