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Title: Use of 41Ar production to measure ablator areal density in NIF beryllium implosions

For the first time, 41Ar produced by the (n,Υ) reaction from 40Ar in the beryllium shell of a DT filled Inertial Confinement Fusion capsule has been measured. Ar is co-deposited with beryllium in the sputter deposition of the capsule shell. Combined with a measurement of the neutron yield, the radioactive 41Ar then quantifies the areal density of beryllium during the DT neutron production. Here, the measured 1.15 ± 0.17 × 10 +8 atoms of 41Ar are 2.5 times that from the best post-shot calculation, suggesting that the Ar and Be areal densities are correspondingly higher than those calculated. Possible explanations are that (1) the beryllium shell is compressed more than calculated, (2) beryllium has mixed into the cold DT ice, or more likely (3) less beryllium is ablated than calculated. Since only one DT filled beryllium capsule has been fielded at NIF, these results can be confirmed and expanded in the future.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ; ORCiD logo [2] ;  [3] ; ORCiD logo [2] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [2] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Report Number(s):
LA-UR-16-28102; LLNL-JRNL-734218
Journal ID: ISSN 1070-664X; TRN: US1700882
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344; NA00001808
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICF; NIF; beryllium; argon; radio-activation; 70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1351986
Alternate Identifier(s):
OSTI ID: 1416494

Wilson, Douglas Carl, Cassata, W. S., Sepke, S. M., Velsko, C. A., Huang, H., Yeamans, C. B., Kline, John L., Yi, A., Simakov, Andrei Nikolaevich, Haan, S. W., Batha, Steven H., Dewald, E. L., Rygg, J. R., Tommasini, R., Xu, H., Kong, C., Bae, J., and Rice, N.. Use of 41Ar production to measure ablator areal density in NIF beryllium implosions. United States: N. p., Web. doi:10.1063/1.4975187.
Wilson, Douglas Carl, Cassata, W. S., Sepke, S. M., Velsko, C. A., Huang, H., Yeamans, C. B., Kline, John L., Yi, A., Simakov, Andrei Nikolaevich, Haan, S. W., Batha, Steven H., Dewald, E. L., Rygg, J. R., Tommasini, R., Xu, H., Kong, C., Bae, J., & Rice, N.. Use of 41Ar production to measure ablator areal density in NIF beryllium implosions. United States. doi:10.1063/1.4975187.
Wilson, Douglas Carl, Cassata, W. S., Sepke, S. M., Velsko, C. A., Huang, H., Yeamans, C. B., Kline, John L., Yi, A., Simakov, Andrei Nikolaevich, Haan, S. W., Batha, Steven H., Dewald, E. L., Rygg, J. R., Tommasini, R., Xu, H., Kong, C., Bae, J., and Rice, N.. 2017. "Use of 41Ar production to measure ablator areal density in NIF beryllium implosions". United States. doi:10.1063/1.4975187. https://www.osti.gov/servlets/purl/1351986.
@article{osti_1351986,
title = {Use of 41Ar production to measure ablator areal density in NIF beryllium implosions},
author = {Wilson, Douglas Carl and Cassata, W. S. and Sepke, S. M. and Velsko, C. A. and Huang, H. and Yeamans, C. B. and Kline, John L. and Yi, A. and Simakov, Andrei Nikolaevich and Haan, S. W. and Batha, Steven H. and Dewald, E. L. and Rygg, J. R. and Tommasini, R. and Xu, H. and Kong, C. and Bae, J. and Rice, N.},
abstractNote = {For the first time, 41Ar produced by the (n,Υ) reaction from 40Ar in the beryllium shell of a DT filled Inertial Confinement Fusion capsule has been measured. Ar is co-deposited with beryllium in the sputter deposition of the capsule shell. Combined with a measurement of the neutron yield, the radioactive 41Ar then quantifies the areal density of beryllium during the DT neutron production. Here, the measured 1.15 ± 0.17 × 10+8 atoms of 41Ar are 2.5 times that from the best post-shot calculation, suggesting that the Ar and Be areal densities are correspondingly higher than those calculated. Possible explanations are that (1) the beryllium shell is compressed more than calculated, (2) beryllium has mixed into the cold DT ice, or more likely (3) less beryllium is ablated than calculated. Since only one DT filled beryllium capsule has been fielded at NIF, these results can be confirmed and expanded in the future.},
doi = {10.1063/1.4975187},
journal = {Physics of Plasmas},
number = 2,
volume = 24,
place = {United States},
year = {2017},
month = {2}
}