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Title: Anomalous yield reduction in direct-drive DT implosions due to 3He addition

Abstract

Glass capsules were imploded in direct drive on the OMEGA laser [T. R. Boehly et aI., Opt. Commun. 133, 495, 1997] to look for anomalous degradation in deuterium/tritium (DT) yield (i.e., beyond what is predicted) and changes in reaction history with {sup 3}He addition. Such anomalies have previously been reported for D/{sup 3}He plasmas, but had not yet been investigated for DT/{sup 3}He. Anomalies such as these provide fertile ground for furthering our physics understanding of ICF implosions and capsule performance. A relatively short laser pulse (600 ps) was used to provide some degree of temporal separation between shock and compression yield components for analysis. Anomalous degradation in the compression component of yield was observed, consistent with the 'factor of two' degradation previously reported by MIT at a 50% {sup 3}He atom fraction in D{sub 2} using plastic capsules [Rygg et aI., Phys. Plasmas 13, 052702 (2006)]. However, clean calculations (i.e., no fuel-shell mixing) predict the shock component of yield quite well, contrary to the result reported by MIT, but consistent with LANL results in D{sub 2}/{sup 3}He [Wilson, et aI., lml Phys: Conf Series 112, 022015 (2008)]. X-ray imaging suggests less-than-predicted compression ofcapsules containing {sup 3}He. Leading candidate explanationsmore » are poorly understood Equation-of-State (EOS) for gas mixtures, and unanticipated particle pressure variation with increasing {sup 3}He addition.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2] more »;  [3];  [3];  [4] « less
  1. Los Alamos National Laboratory
  2. AWE, UK
  3. UNIV OF ROCHESTER
  4. MIT
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
956618
Report Number(s):
LA-UR-08-07791; LA-UR-08-7791
Journal ID: ISSN 1070-664X; PHPAEN; TRN: US1006236
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 16; Journal Issue: 5; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70; CAPSULES; COMPRESSION; DECOMPOSITION; DEUTERIUM; DIRECT DRIVE LASER IMPLOSION; GLASS; HELIUM 3; IMPLOSIONS; INERTIAL CONFINEMENT; MIXING; MIXTURES; PARTICLES; PERFORMANCE; PLASMA HEATING; PLASMA PRODUCTION; PLASTICS; REDUCTION; SHOCK WAVES; TRITIUM; VARIATIONS; YIELDS

Citation Formats

Herrmann, Hans W, Langenbrunner, James R, Mack, Joseph M, Cooley, James H, Wilson, Douglas C, Evans, Scott C, Sedillo, Tom J, Kyrala, George A, Caldwell, Stephen E, Young, Carlton A, Nobile, Arthur, Wermer, Joseph R, Paglieri, Stephen N, Mcevoy, Aaron M, Kim, Yong Ho, Batha, Steven H, Horsfield, Colin J, Drew, Dave, Garbett, Warren, Rubery, Michael, Glebov, Vladimir Yu, Roberts, Samuel, and Frenje, Johan A. Anomalous yield reduction in direct-drive DT implosions due to 3He addition. United States: N. p., 2008. Web.
Herrmann, Hans W, Langenbrunner, James R, Mack, Joseph M, Cooley, James H, Wilson, Douglas C, Evans, Scott C, Sedillo, Tom J, Kyrala, George A, Caldwell, Stephen E, Young, Carlton A, Nobile, Arthur, Wermer, Joseph R, Paglieri, Stephen N, Mcevoy, Aaron M, Kim, Yong Ho, Batha, Steven H, Horsfield, Colin J, Drew, Dave, Garbett, Warren, Rubery, Michael, Glebov, Vladimir Yu, Roberts, Samuel, & Frenje, Johan A. Anomalous yield reduction in direct-drive DT implosions due to 3He addition. United States.
Herrmann, Hans W, Langenbrunner, James R, Mack, Joseph M, Cooley, James H, Wilson, Douglas C, Evans, Scott C, Sedillo, Tom J, Kyrala, George A, Caldwell, Stephen E, Young, Carlton A, Nobile, Arthur, Wermer, Joseph R, Paglieri, Stephen N, Mcevoy, Aaron M, Kim, Yong Ho, Batha, Steven H, Horsfield, Colin J, Drew, Dave, Garbett, Warren, Rubery, Michael, Glebov, Vladimir Yu, Roberts, Samuel, and Frenje, Johan A. Tue . "Anomalous yield reduction in direct-drive DT implosions due to 3He addition". United States. https://www.osti.gov/servlets/purl/956618.
@article{osti_956618,
title = {Anomalous yield reduction in direct-drive DT implosions due to 3He addition},
author = {Herrmann, Hans W and Langenbrunner, James R and Mack, Joseph M and Cooley, James H and Wilson, Douglas C and Evans, Scott C and Sedillo, Tom J and Kyrala, George A and Caldwell, Stephen E and Young, Carlton A and Nobile, Arthur and Wermer, Joseph R and Paglieri, Stephen N and Mcevoy, Aaron M and Kim, Yong Ho and Batha, Steven H and Horsfield, Colin J and Drew, Dave and Garbett, Warren and Rubery, Michael and Glebov, Vladimir Yu and Roberts, Samuel and Frenje, Johan A},
abstractNote = {Glass capsules were imploded in direct drive on the OMEGA laser [T. R. Boehly et aI., Opt. Commun. 133, 495, 1997] to look for anomalous degradation in deuterium/tritium (DT) yield (i.e., beyond what is predicted) and changes in reaction history with {sup 3}He addition. Such anomalies have previously been reported for D/{sup 3}He plasmas, but had not yet been investigated for DT/{sup 3}He. Anomalies such as these provide fertile ground for furthering our physics understanding of ICF implosions and capsule performance. A relatively short laser pulse (600 ps) was used to provide some degree of temporal separation between shock and compression yield components for analysis. Anomalous degradation in the compression component of yield was observed, consistent with the 'factor of two' degradation previously reported by MIT at a 50% {sup 3}He atom fraction in D{sub 2} using plastic capsules [Rygg et aI., Phys. Plasmas 13, 052702 (2006)]. However, clean calculations (i.e., no fuel-shell mixing) predict the shock component of yield quite well, contrary to the result reported by MIT, but consistent with LANL results in D{sub 2}/{sup 3}He [Wilson, et aI., lml Phys: Conf Series 112, 022015 (2008)]. X-ray imaging suggests less-than-predicted compression ofcapsules containing {sup 3}He. Leading candidate explanations are poorly understood Equation-of-State (EOS) for gas mixtures, and unanticipated particle pressure variation with increasing {sup 3}He addition.},
doi = {},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 16,
place = {United States},
year = {2008},
month = {1}
}