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Title: Variable convergence liquid layer implosions on the National Ignition Facility

Liquid layer implosions using the “wetted foam” technique, where the liquid fuel is wicked into a supporting foam, have been recently conducted on the National Ignition Facility for the first time [Olson et al., Phys. Rev. Lett. 117, 245001 (2016)]. In this paper, we report on a series of wetted foam implosions where the convergence ratio was varied between 12 and 20. Reduced nuclear performance is observed as convergence ratio increases. 2-D radiation-hydrodynamics simulations accurately capture the performance at convergence ratios (CR) ~ 12, but we observe a significant discrepancy at CR ~ 20. Finally, this may be due to suppressed hot-spot formation or an anomalous energy loss mechanism.
Authors:
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  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-17-29966
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344; NA0001808
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (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; plasma confinement; spectra; hydrodynamics; Doppler effect; x-rays; natural gas; tectonophysics; thermal conductivity
OSTI Identifier:
1435526
Alternate Identifier(s):
OSTI ID: 1426844

Zylstra, A. B., Yi, S. A., Haines, B. M., Olson, R. E., Leeper, R. J., Braun, T., Biener, J., Kline, J. L., Batha, S. H., Berzak Hopkins, L., Bhandarkar, S., Bradley, P. A., Crippen, J., Farrell, M., Fittinghoff, D., Herrmann, H. W., Huang, H., Khan, S., Kong, C., Kozioziemski, B. J., Kyrala, G. A., Ma, T., Meezan, N. B., Merrill, F., Nikroo, A., Peterson, R. R., Rice, N., Sater, J. D., Shah, R. C., Stadermann, M., Volegov, P., Walters, C., and Wilson, D. C.. Variable convergence liquid layer implosions on the National Ignition Facility. United States: N. p., Web. doi:10.1063/1.5016349.
Zylstra, A. B., Yi, S. A., Haines, B. M., Olson, R. E., Leeper, R. J., Braun, T., Biener, J., Kline, J. L., Batha, S. H., Berzak Hopkins, L., Bhandarkar, S., Bradley, P. A., Crippen, J., Farrell, M., Fittinghoff, D., Herrmann, H. W., Huang, H., Khan, S., Kong, C., Kozioziemski, B. J., Kyrala, G. A., Ma, T., Meezan, N. B., Merrill, F., Nikroo, A., Peterson, R. R., Rice, N., Sater, J. D., Shah, R. C., Stadermann, M., Volegov, P., Walters, C., & Wilson, D. C.. Variable convergence liquid layer implosions on the National Ignition Facility. United States. doi:10.1063/1.5016349.
Zylstra, A. B., Yi, S. A., Haines, B. M., Olson, R. E., Leeper, R. J., Braun, T., Biener, J., Kline, J. L., Batha, S. H., Berzak Hopkins, L., Bhandarkar, S., Bradley, P. A., Crippen, J., Farrell, M., Fittinghoff, D., Herrmann, H. W., Huang, H., Khan, S., Kong, C., Kozioziemski, B. J., Kyrala, G. A., Ma, T., Meezan, N. B., Merrill, F., Nikroo, A., Peterson, R. R., Rice, N., Sater, J. D., Shah, R. C., Stadermann, M., Volegov, P., Walters, C., and Wilson, D. C.. 2018. "Variable convergence liquid layer implosions on the National Ignition Facility". United States. doi:10.1063/1.5016349.
@article{osti_1435526,
title = {Variable convergence liquid layer implosions on the National Ignition Facility},
author = {Zylstra, A. B. and Yi, S. A. and Haines, B. M. and Olson, R. E. and Leeper, R. J. and Braun, T. and Biener, J. and Kline, J. L. and Batha, S. H. and Berzak Hopkins, L. and Bhandarkar, S. and Bradley, P. A. and Crippen, J. and Farrell, M. and Fittinghoff, D. and Herrmann, H. W. and Huang, H. and Khan, S. and Kong, C. and Kozioziemski, B. J. and Kyrala, G. A. and Ma, T. and Meezan, N. B. and Merrill, F. and Nikroo, A. and Peterson, R. R. and Rice, N. and Sater, J. D. and Shah, R. C. and Stadermann, M. and Volegov, P. and Walters, C. and Wilson, D. C.},
abstractNote = {Liquid layer implosions using the “wetted foam” technique, where the liquid fuel is wicked into a supporting foam, have been recently conducted on the National Ignition Facility for the first time [Olson et al., Phys. Rev. Lett. 117, 245001 (2016)]. In this paper, we report on a series of wetted foam implosions where the convergence ratio was varied between 12 and 20. Reduced nuclear performance is observed as convergence ratio increases. 2-D radiation-hydrodynamics simulations accurately capture the performance at convergence ratios (CR) ~ 12, but we observe a significant discrepancy at CR ~ 20. Finally, this may be due to suppressed hot-spot formation or an anomalous energy loss mechanism.},
doi = {10.1063/1.5016349},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}