Abstract

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). 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.

Details

Title
Direct-drive DT implosions with Knudsen number variations
Author
Kim, Y 1 ; Herrmann, H W 1 ; Hoffman, N M 1 ; Schmitt, M J 1 ; Bradley, P A 1 ; Gales, S 2 ; Horsfield, C J 2 ; Rubery, M 2 ; Leatherland, A 2 ; Johnson, M Gatu 3 ; Frenje, J A 3 ; V Yu Glebov 4 

 Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 
 Atomic Weapons Establishment, Aldermaston, Reading, Berkshire RG7 4PR, UK 
 Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 
 Laboratory for Laser Energetics, Rochester, New York 14623, USA 
Publication year
2016
Publication date
May 2016
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2575121875
Copyright
© 2016. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.