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Title: Development of the CD Symcap platform to study gas-shell mix in implosions at the National Ignition Facility

Abstract

Surrogate implosions play an important role at the National Ignition Facility (NIF) for isolating aspects of the complex physical processes associated with fully integrated ignition experiments. The newly developed CD Symcap platform has been designed to study gas-shell mix in indirectly driven, pure T{sub 2}-gas filled CH-shell implosions equipped with 4 μm thick CD layers. This configuration provides a direct nuclear signature of mix as the DT yield (above a characterized D contamination background) is produced by D from the CD layer in the shell, mixing into the T-gas core. The CD layer can be placed at different locations within the CH shell to probe the depth and extent of mix. CD layers placed flush with the gas-shell interface and recessed up to 8 μm have shown that most of the mix occurs at the inner-shell surface. In addition, time-gated x-ray images of the hotspot show large brightly radiating objects traversing through the hotspot around bang-time, which are likely chunks of CH/CD plastic. This platform is a powerful new capability at the NIF for understanding mix, one of the key performance issues for ignition experiments.

Authors:
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  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22303645
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DESIGN; IMPLOSIONS; LAYERS; THERMONUCLEAR IGNITION; US NATIONAL IGNITION FACILITY; X RADIATION

Citation Formats

Casey, D. T., Smalyuk, V. A., Tipton, R. E., Pino, J. E., Remington, B. A., Rowley, D. P., Weber, S. V., Barrios, M., Benedetti, L. R., Bleuel, D. L., Bond, E. J., Bradley, D. K., Caggiano, J. A., Callahan, D. A., Cerjan, C. J., Edwards, M. J., Fittinghoff, D., Glenn, S., Haan, S. W., Hamza, A., and and others. Development of the CD Symcap platform to study gas-shell mix in implosions at the National Ignition Facility. United States: N. p., 2014. Web. doi:10.1063/1.4894215.
Casey, D. T., Smalyuk, V. A., Tipton, R. E., Pino, J. E., Remington, B. A., Rowley, D. P., Weber, S. V., Barrios, M., Benedetti, L. R., Bleuel, D. L., Bond, E. J., Bradley, D. K., Caggiano, J. A., Callahan, D. A., Cerjan, C. J., Edwards, M. J., Fittinghoff, D., Glenn, S., Haan, S. W., Hamza, A., & and others. Development of the CD Symcap platform to study gas-shell mix in implosions at the National Ignition Facility. United States. doi:10.1063/1.4894215.
Casey, D. T., Smalyuk, V. A., Tipton, R. E., Pino, J. E., Remington, B. A., Rowley, D. P., Weber, S. V., Barrios, M., Benedetti, L. R., Bleuel, D. L., Bond, E. J., Bradley, D. K., Caggiano, J. A., Callahan, D. A., Cerjan, C. J., Edwards, M. J., Fittinghoff, D., Glenn, S., Haan, S. W., Hamza, A., and and others. Mon . "Development of the CD Symcap platform to study gas-shell mix in implosions at the National Ignition Facility". United States. doi:10.1063/1.4894215.
@article{osti_22303645,
title = {Development of the CD Symcap platform to study gas-shell mix in implosions at the National Ignition Facility},
author = {Casey, D. T. and Smalyuk, V. A. and Tipton, R. E. and Pino, J. E. and Remington, B. A. and Rowley, D. P. and Weber, S. V. and Barrios, M. and Benedetti, L. R. and Bleuel, D. L. and Bond, E. J. and Bradley, D. K. and Caggiano, J. A. and Callahan, D. A. and Cerjan, C. J. and Edwards, M. J. and Fittinghoff, D. and Glenn, S. and Haan, S. W. and Hamza, A. and and others},
abstractNote = {Surrogate implosions play an important role at the National Ignition Facility (NIF) for isolating aspects of the complex physical processes associated with fully integrated ignition experiments. The newly developed CD Symcap platform has been designed to study gas-shell mix in indirectly driven, pure T{sub 2}-gas filled CH-shell implosions equipped with 4 μm thick CD layers. This configuration provides a direct nuclear signature of mix as the DT yield (above a characterized D contamination background) is produced by D from the CD layer in the shell, mixing into the T-gas core. The CD layer can be placed at different locations within the CH shell to probe the depth and extent of mix. CD layers placed flush with the gas-shell interface and recessed up to 8 μm have shown that most of the mix occurs at the inner-shell surface. In addition, time-gated x-ray images of the hotspot show large brightly radiating objects traversing through the hotspot around bang-time, which are likely chunks of CH/CD plastic. This platform is a powerful new capability at the NIF for understanding mix, one of the key performance issues for ignition experiments.},
doi = {10.1063/1.4894215},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 9,
volume = 21,
place = {United States},
year = {2014},
month = {9}
}