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Title: Direct-drive DT implosions with Knudsen number variations

Journal Article · · Journal of Physics. Conference Series
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Atomic Weapons Establishment (United Kingdom)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Laboratory for Laser Energetics, Rochester, NY (United States)
+ Show Author Affiliations

Direct-drive implosions of DT-filled plastic-shells have been conducted at the Omega laser facility, measuring nuclear yields while varying Knudsen numbers (i.e., the ratio of mean free path of fusing ions to the length of fuel region) by adjusting both shell thickness (e.g., 7.5, 15, 20, 30 μm) and fill pressure (e.g., 2, 5, 15 atm). In addition, the fusion reactivity reduction model showed a stronger effect on yield as the Knudsen number increases (or the shell thickness decreases). The Reduced-Ion-Kinetic (RIK) simulation which includes both fusion reactivity reduction and mix model was necessary to provide a better match between the observed neutron yields and those simulated.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1337088
Report Number(s):
LA-UR-15-29134
Journal Information:
Journal of Physics. Conference Series, Vol. 717; ISSN 1742-6588
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

References (6)

Knudsen Layer Reduction of Fusion Reactivity journal August 2012
The physics issues that determine inertial confinement fusion target gain and driver requirements: A tutorial journal May 1999
Revised Knudsen-layer reduction of fusion reactivity journal December 2013
Approximate models for the ion-kinetic regime in inertial-confinement-fusion capsule implosions journal May 2015
Self-Similar Structure and Experimental Signatures of Suprathermal Ion Distribution in Inertial Confinement Fusion Implosions journal September 2015
Thermo-diffusion in inertially confined plasmas journal April 2014

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS