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Title: Recent and planned hydrodynamic instability experiments on indirect-drive implosions on the National Ignition Facility

Journal Article · · High Energy Density Physics
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). NIF Directorate
  2. General Atomics, San Diego, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

At National Ignition Facility (NIF), yield amplification due to alpha particle heating approached ~3 in the highest performing inertial confinement fusion (ICF) implosions, while yield amplification of ~15-30 is needed for ignition. Hydrodynamic instabilities are a major factor in degradation of implosions while understanding and mitigation of the instabilities are critical to achieving ignition. This article describes recent and planned hydrodynamic instability experiments with several focused platforms that have been developed to directly measure these instabilities in all phases of ICF implosions. Measurements of ripple-shock generation at OMEGA laser have indicated initial seeds for the instabilities in three ablators - plastic (CH), beryllium, and high-density carbon (HDC). Hydrodynamic Growth Radiography (HGR) platform was used to measure instability growth at the ablation front in the acceleration phase of implosions. This platform used pre-imposed 2-D perturbations for growth factor measurements at different perturbation wavelengths and was also used to measure growth of “native roughness” modulations, fill tubes, and capsule support membranes or “tents”. Also, in the acceleration phase several new experimental platforms have been or are being developed to measure instability growth at the ablator-ice interface. In the deceleration phase of implosions, “self-emission” and “self-backlighting” platforms were developed to measure perturbations near peak compression. This article reviews recent progress and results.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; NA0001808
OSTI ID:
1763943
Alternate ID(s):
OSTI ID: 1780088
Report Number(s):
LLNL-JRNL-800864; 1003105; TRN: US2206112
Journal Information:
High Energy Density Physics, Vol. 36, Issue na; ISSN 1574-1818
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (14)

Review of hydrodynamic instability experiments in inertially confined fusion implosions on National Ignition Facility journal October 2019
Mix and hydrodynamic instabilities on NIF journal June 2017
Moiré interferometry of short wavelength Rayleigh–Taylor growth journal January 1999
Fuel gain exceeding unity in an inertially confined fusion implosion journal February 2014
Instability of the interface of two gases accelerated by a shock wave journal January 1972
Hydrodynamic instability experiments with three-dimensional modulations at the National Ignition Facility journal January 2015
Update 2015 on Target Fabrication Requirements for NIF Layered Implosions, with Emphasis on Capsule Support and Oxygen Modulations in GDP journal September 2016
Taylor instability in shock acceleration of compressible fluids journal May 1960
X-ray streaked refraction enhanced radiography for inferring inflight density gradients in ICF capsule implosions journal October 2018
Differential ablator-fuel adiabat tuning in indirect-drive implosions journal March 2015
Reduced instability growth with high-adiabat high-foot implosions at the National Ignition Facility journal July 2014
Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications journal September 1972
Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators journal September 2018
X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube journal March 2017

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY