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Title: Wetted foam liquid fuel ICF target experiments

Journal Article · · Journal of Physics. Conference Series
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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We are developing a new NIF experimental platform that employs wetted foam liquid fuel layer ICF capsules. We will use the liquid fuel layer capsules in a NIF sub-scale experimental campaign to explore the relationship between hot spot convergence ratio (CR) and the predictability of hot spot formation. DT liquid layer ICF capsules allow for flexibility in hot spot CR via the adjustment of the initial cryogenic capsule temperature and, hence, DT vapor density. Our hypothesis is that the predictive capability of hot spot formation is robust and 1D-like for a relatively low CR hot spot (CR~15), but will become less reliable as hot spot CR is increased to CR>20. Simulations indicate that backing off on hot spot CR is an excellent way to reduce capsule instability growth and to improve robustness to low-mode x-ray flux asymmetries. In the initial experiments, we will test our hypothesis by measuring hot spot size, neutron yield, ion temperature, and burn width to infer hot spot pressure and compare to predictions for implosions with hot spot CR's in the range of 12 to 25. Larger scale experiments are also being designed, and we will advance from sub-scale to full-scale NIF experiments to determine if 1D-like behavior at low CR is retained as the scale-size is increased. The long-term objective is to develop a liquid fuel layer ICF capsule platform with robust thermonuclear burn, modest CR, and significant α-heating with burn propagation.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1258472
Report Number(s):
LA-UR-16-20284
Journal Information:
Journal of Physics. Conference Series, Vol. 717; Conference: Inertial Fusion Sciences and Applications, Seattle, WA (United States), 20-25 Sep 2015; ISSN 1742-6588
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

References (7)

Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility journal May 2011
Alternative hot spot formation techniques using liquid deuterium-tritium layer inertial confinement fusion capsules journal September 2013
A new approach to foam-lined indirect-drive NIF ignition targets journal April 2012
In Situ Real-Time Radiographic Study of Thin Film Formation Inside Rotating Hollow Spheres journal January 2016
First High-Convergence Cryogenic Implosion in a Near-Vacuum Hohlraum journal April 2015
Integrated diagnostic analysis of inertial confinement fusion capsule performance journal May 2013
Near-vacuum hohlraums for driving fusion implosions with high density carbon ablatorsa) journal May 2015

Cited By (5)

Variable convergence liquid layer implosions on the National Ignition Facility journal May 2018
Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range journal March 2018
Indirect drive ignition at the National Ignition Facility journal October 2016
Kinetic physics in ICF: present understanding and future directions journal April 2018
Absolute Hugoniot Measurements for CH Foams in the 2-9 MBAR Range conference June 2018

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY