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Title: Mix and hydrodynamic instabilities on NIF

Journal Article · · Journal of Instrumentation
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
+ Show Author Affiliations

Several new platforms have been developed to experimentally measure hydrodynamic instabilities in all phases of indirect-drive, inertial confinement fusion implosions on National Ignition Facility. At the ablation front, instability growth of pre-imposed modulations was measured with a face-on, x-ray radiography platform in the linear regime using the Hydrodynamic Growth Radiography (HGR) platform. Modulation growth of "native roughness" modulations and engineering features (fill tubes and capsule support membranes) were measured in conditions relevant to layered DT implosions. A new experimental platform was developed to measure instability growth at the ablator-ice interface. Here in the deceleration phase of implosions, several experimental platforms were developed to measure both low-mode asymmetries and high-mode perturbations near peak compression with x-ray and nuclear techniques. In one innovative technique, the self-emission from the hot spot was enhanced with argon dopant to "self-backlight" the shell in-flight. To stabilize instability growth, new "adiabat-shaping" techniques were developed using the HGR platform and applied in layered DT implosions.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344; NA0001808
OSTI ID:
1378520
Report Number(s):
LLNL-JRNL-728861
Journal Information:
Journal of Instrumentation, Vol. 12, Issue 06; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

References (18)

Neutron activation diagnostics at the National Ignition Facility (invited) journal October 2012
Tent-induced perturbations on areal density of implosions at the National Ignition Facilitya) journal May 2015
Experimental results of radiation-driven, layered deuterium-tritium implosions with adiabat-shaped drives at the National Ignition Facility journal October 2016
Instability growth seeded by oxygen in CH shells on the National Ignition Facility journal March 2015
Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility journal April 2017
Hydrodynamic instability growth of three-dimensional, “native-roughness” modulations in x-ray driven, spherical implosions at the National Ignition Facility journal July 2015
A survey of pulse shape options for a revised plastic ablator ignition design journal November 2014
Performance of indirectly driven capsule implosions on the National Ignition Facility using adiabat-shaping journal May 2016
Validating hydrodynamic growth in National Ignition Facility implosionsa) journal May 2015
Diagnosing and controlling mix in National Ignition Facility implosion experiments journal May 2011
Simulations and experiments of the growth of the “tent” perturbation in NIF ignition implosions journal May 2016
An in-flight radiography platform to measure hydrodynamic instability growth in inertial confinement fusion capsules at the National Ignition Facility journal July 2014
Hydrodynamic instability experiments with three-dimensional modulations at the National Ignition Facility journal January 2015
Design of indirectly driven, high-compression Inertial Confinement Fusion implosions with improved hydrodynamic stability using a 4-shock adiabat-shaped drive journal December 2015
Hydrodynamic instability growth and mix experiments at the National Ignition Facility journal May 2014
Fluence-compensated down-scattered neutron imaging using the neutron imaging system at the National Ignition Facility journal August 2016
Improved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive journal September 2015
Measurements of an Ablator-Gas Atomic Mix in Indirectly Driven Implosions at the National Ignition Facility journal January 2014

Cited By (9)

Review of hydro-instability experiments with alternate capsule supports in indirect-drive implosions on the National Ignition Facility journal July 2018
Hydro-instability growth of perturbation seeds from alternate capsule-support strategies in indirect-drive implosions on National Ignition Facility journal October 2017
Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility journal May 2018
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities journal August 2019
Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF journal August 2018
X-ray penumbral imaging diagnostic developments at the National Ignition Facility
  • Felker, Sean J.; Bachmann, Benjamin; Abu Shawareb, Hatim
  • Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI https://doi.org/10.1117/12.2274611
conference September 2017
Rayleigh–Taylor instabilities in high-energy density settings on the National Ignition Facility journal June 2018
Measurement of the sound speed in dense fluid deuterium along the cryogenic liquid Hugoniot journal January 2019
Review of hydrodynamic instability experiments in inertially confined fusion implosions on National Ignition Facility journal October 2019

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Related Subjects

42 ENGINEERING
70 PLASMA PHYSICS AND FUSION