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Title: Symmetry control using beam phasing in ~0.2 NIF scale high temperature Hohlraum experiment on OMEGA

Abstract

Results are shown from recent experiments at the Omega laser facility, using 40 Omega beams driving the hohlraum with 3 cones from each side and up to 19.5 kJ of laser energy. Beam phasing is achieved by decreasing the energy separately in each of the three cones, by 3 kJ, for a total drive energy of 16.5kJ. This results in a more asymmetric drive, which will vary the shape of the imploded symmetry capsule core from round to oblate or prolate in a systematic and controlled manner. These results would be the first demonstration of beam phasing for implosions in such 'high temperature' (275 eV) hohlraums at Omega. Dante measurements confirmed the predicted peak drive temperatures of 275 eV. Implosion core time dependent x-ray images were obtained from framing camera data which show the expected change in symmetry due to beam phasing and which also agree well with post processed hydro code calculations. Time resolved hard x-ray data has been obtained and it was found that the hard x-rays are correlated mainly with the low angle 21{sup o} degree cone.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Los Alamos National Laboratory
  2. ROCHESTER, NY
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
972050
Report Number(s):
LA-UR-09-06506; LA-UR-09-6506
TRN: US1001454
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
70; CAMERAS; CONES; IMPLOSIONS; LASERS; SHAPE; SYMMETRY

Citation Formats

Delamater, Norman D, Wilson, Goug C, Kyrala, George A, Seifter, Achim, Hoffman, N M, Dodd, E, and Glebov, V. Symmetry control using beam phasing in ~0.2 NIF scale high temperature Hohlraum experiment on OMEGA. United States: N. p., 2009. Web.
Delamater, Norman D, Wilson, Goug C, Kyrala, George A, Seifter, Achim, Hoffman, N M, Dodd, E, & Glebov, V. Symmetry control using beam phasing in ~0.2 NIF scale high temperature Hohlraum experiment on OMEGA. United States.
Delamater, Norman D, Wilson, Goug C, Kyrala, George A, Seifter, Achim, Hoffman, N M, Dodd, E, and Glebov, V. Thu . "Symmetry control using beam phasing in ~0.2 NIF scale high temperature Hohlraum experiment on OMEGA". United States. https://www.osti.gov/servlets/purl/972050.
@article{osti_972050,
title = {Symmetry control using beam phasing in ~0.2 NIF scale high temperature Hohlraum experiment on OMEGA},
author = {Delamater, Norman D and Wilson, Goug C and Kyrala, George A and Seifter, Achim and Hoffman, N M and Dodd, E and Glebov, V},
abstractNote = {Results are shown from recent experiments at the Omega laser facility, using 40 Omega beams driving the hohlraum with 3 cones from each side and up to 19.5 kJ of laser energy. Beam phasing is achieved by decreasing the energy separately in each of the three cones, by 3 kJ, for a total drive energy of 16.5kJ. This results in a more asymmetric drive, which will vary the shape of the imploded symmetry capsule core from round to oblate or prolate in a systematic and controlled manner. These results would be the first demonstration of beam phasing for implosions in such 'high temperature' (275 eV) hohlraums at Omega. Dante measurements confirmed the predicted peak drive temperatures of 275 eV. Implosion core time dependent x-ray images were obtained from framing camera data which show the expected change in symmetry due to beam phasing and which also agree well with post processed hydro code calculations. Time resolved hard x-ray data has been obtained and it was found that the hard x-rays are correlated mainly with the low angle 21{sup o} degree cone.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {1}
}