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Hydrodynamic instabilities seeded by the X-ray shadow of ICF capsule fill-tubes [X-ray shadow imprint of hydrodynamic instabilities seeded by the fill-tube]

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5037816· OSTI ID:1476853
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Diamond Materials GmbH, Freiburg (Germany)
During the first few hundred picoseconds of indirect drive for inertial confinement fusion on the National Ignition Facility, x-ray spots formed on the hohlraum wall when the drive beams cast shadows of the fuel fill-tube on the capsule surface. Differential ablation at the shadow boundaries seeds perturbations which are hydrodynamically unstable under subsequent acceleration and can grow to impact capsule performance. Furthermore, we have characterized this shadow imprint mechanism and demonstrated two techniques to mitigate against it using (i) a reduced diameter fuel fill-tube, and (ii) a pre-pulse to blow down the fill-tube before the shadow forming x-ray spots from the main outer drive beams develop.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; NA0001808
OSTI ID:
1476853
Alternate ID(s):
OSTI ID: 1462576
Report Number(s):
LLNL-JRNL--750326; 935119
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 25; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions journal May 2019
Making inertial confinement fusion models more predictive journal August 2019
Mixing in ICF implosions on the National Ignition Facility caused by the fill-tube journal March 2020
Review of hydrodynamic instability experiments in inertially confined fusion implosions on National Ignition Facility journal October 2019
Progress of indirect drive inertial confinement fusion in the United States journal July 2019

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