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Alpha heating of indirect-drive layered implosions on the National Ignition Facility

Journal Article · · Physical Review. E
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  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. University of Rochester, NY (United States). Laboratory for Laser Energetics
  3. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
We report in order to understand how close current layered implosions in indirect-drive inertial confinement fusion are to ignition, it is necessary to measure the level of alpha heating present. To this end, pairs of experiments were performed that consisted of a low-yield tritium–hydrogen–deuterium (THD) layered implosion and a high-yield deuterium–tritium (DT) layered implosion to validate experimentally current simulation-based methods of determining yield amplification. The THD capsules were designed to reduce simultaneously DT neutron yield (alpha heating) and maintain hydrodynamic similarity with the higher yield DT capsules. The ratio of the yields measured in these experiments then allowed the alpha heating level of the DT layered implosions to be determined. The level of alpha heating inferred is consistent with fits to simulations expressed in terms of experimentally measurable quantities and enables us to infer the level of alpha heating in recent high-performing implosions.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2280473
Report Number(s):
LLNL--JRNL-822969; 1035549
Journal Information:
Physical Review. E, Journal Name: Physical Review. E Journal Issue: 1 Vol. 107; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
fusion products
indirect drive
inertial confinement fusion