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Title: Early-Time Symmetry Tuning in the Presence of Cross-Beam Energy Transfer in ICF Experiments on the National Ignition Facility

Abstract

At the National Ignition Facility (NIF) we have successfully tuned the early time (~2 ns) lowest order Legendre mode (P2) of the incoming radiation drive asymmetry of indirectly driven ignition capsule implosions by varying the inner power cone fraction. The measured P2/P0 sensitivity vs come fraction is similar to calculations, but a significant -15 to -20% P2/P0 offset was observed. This can be explained by a considerable early time laser energy transfer from the outer to the inner beams during the laser burn-through of the Laser Entrance Hole (LEH) windows and hohlraum fill gas when the LEH plasma is still dense and relatively cold.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1245699
Report Number(s):
LLNL-JRNL-599112
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Dewald, E. L., Milovich, J. L., Michel, P., Landen, O. L., Kline, J. L., Glenn, S., Jones, O., Kalantar, D. H., Pak, A., Robey, H. F., Kyrala, G. A., Divol, L., Benedetti, L. R., Holder, J., Widmann, K., Moore, A., Schneider, M. B., Döppner, T., Tommasini, R., Bradley, D. K., Bell, P., Ehrlich, B., Thomas, C. A., Shaw, M., Widmayer, C., Callahan, D. A., Meezan, N. B., Town, R. P. J., Hamza, A., Dzenitis, B., Nikroo, A., Moreno, K., Van Wonterghem, B., Mackinnon, A. J., Glenzer, S. H., MacGowan, B. J., Kilkenny, J. D., Edwards, M. J., Atherton, L. J., and Moses, E. I. Early-Time Symmetry Tuning in the Presence of Cross-Beam Energy Transfer in ICF Experiments on the National Ignition Facility. United States: N. p., 2013. Web. doi:10.1103/PhysRevLett.111.235001.
Dewald, E. L., Milovich, J. L., Michel, P., Landen, O. L., Kline, J. L., Glenn, S., Jones, O., Kalantar, D. H., Pak, A., Robey, H. F., Kyrala, G. A., Divol, L., Benedetti, L. R., Holder, J., Widmann, K., Moore, A., Schneider, M. B., Döppner, T., Tommasini, R., Bradley, D. K., Bell, P., Ehrlich, B., Thomas, C. A., Shaw, M., Widmayer, C., Callahan, D. A., Meezan, N. B., Town, R. P. J., Hamza, A., Dzenitis, B., Nikroo, A., Moreno, K., Van Wonterghem, B., Mackinnon, A. J., Glenzer, S. H., MacGowan, B. J., Kilkenny, J. D., Edwards, M. J., Atherton, L. J., & Moses, E. I. Early-Time Symmetry Tuning in the Presence of Cross-Beam Energy Transfer in ICF Experiments on the National Ignition Facility. United States. https://doi.org/10.1103/PhysRevLett.111.235001
Dewald, E. L., Milovich, J. L., Michel, P., Landen, O. L., Kline, J. L., Glenn, S., Jones, O., Kalantar, D. H., Pak, A., Robey, H. F., Kyrala, G. A., Divol, L., Benedetti, L. R., Holder, J., Widmann, K., Moore, A., Schneider, M. B., Döppner, T., Tommasini, R., Bradley, D. K., Bell, P., Ehrlich, B., Thomas, C. A., Shaw, M., Widmayer, C., Callahan, D. A., Meezan, N. B., Town, R. P. J., Hamza, A., Dzenitis, B., Nikroo, A., Moreno, K., Van Wonterghem, B., Mackinnon, A. J., Glenzer, S. H., MacGowan, B. J., Kilkenny, J. D., Edwards, M. J., Atherton, L. J., and Moses, E. I. Sun . "Early-Time Symmetry Tuning in the Presence of Cross-Beam Energy Transfer in ICF Experiments on the National Ignition Facility". United States. https://doi.org/10.1103/PhysRevLett.111.235001. https://www.osti.gov/servlets/purl/1245699.
@article{osti_1245699,
title = {Early-Time Symmetry Tuning in the Presence of Cross-Beam Energy Transfer in ICF Experiments on the National Ignition Facility},
author = {Dewald, E. L. and Milovich, J. L. and Michel, P. and Landen, O. L. and Kline, J. L. and Glenn, S. and Jones, O. and Kalantar, D. H. and Pak, A. and Robey, H. F. and Kyrala, G. A. and Divol, L. and Benedetti, L. R. and Holder, J. and Widmann, K. and Moore, A. and Schneider, M. B. and Döppner, T. and Tommasini, R. and Bradley, D. K. and Bell, P. and Ehrlich, B. and Thomas, C. A. and Shaw, M. and Widmayer, C. and Callahan, D. A. and Meezan, N. B. and Town, R. P. J. and Hamza, A. and Dzenitis, B. and Nikroo, A. and Moreno, K. and Van Wonterghem, B. and Mackinnon, A. J. and Glenzer, S. H. and MacGowan, B. J. and Kilkenny, J. D. and Edwards, M. J. and Atherton, L. J. and Moses, E. I.},
abstractNote = {At the National Ignition Facility (NIF) we have successfully tuned the early time (~2 ns) lowest order Legendre mode (P2) of the incoming radiation drive asymmetry of indirectly driven ignition capsule implosions by varying the inner power cone fraction. The measured P2/P0 sensitivity vs come fraction is similar to calculations, but a significant -15 to -20% P2/P0 offset was observed. This can be explained by a considerable early time laser energy transfer from the outer to the inner beams during the laser burn-through of the Laser Entrance Hole (LEH) windows and hohlraum fill gas when the LEH plasma is still dense and relatively cold.},
doi = {10.1103/PhysRevLett.111.235001},
journal = {Physical Review Letters},
number = 23,
volume = 111,
place = {United States},
year = {Sun Dec 01 00:00:00 EST 2013},
month = {Sun Dec 01 00:00:00 EST 2013}
}

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