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Title: Yield and compression trends and reproducibility at NIF*

Abstract

The yield and fuel compression trends for the NIF indirect-drive cryogenically-layered DT implosions is empirically examined across all ablators (CH, C and Be) and design in-flight adiabats between 1.5 and 3. Higher compression is observed for a lower design adiabat. Within a design adiabat, compression increases for shorter coast implosions but only if have optimized shock timing. The sensitivity of compression to coast time appears less for higher adiabat designs. Across all designs and ablators, the best DT neutron yields follow the same 1D theoretical curve versus peak velocity, but only if normalize by capsule scale rather than fuel mass and thickness. Shots with reduced yields can be explained by having long coast time, high hot spot mix or know capsule imperfections. Repeat “Standard Candle” shock timing and gas implosions, and DT layered implosions normalized for scale and velocity, reveal adequate reproducibility in shock timing, implosion drive symmetry, compression and yield for the majority of shots. The level of reproducibility is also consistent with known uncertainties and imperfections in initial laser and capsule parameters and outputs. We thus conclude there is no evidence of a significant random unknown variable in these NIF implosions. The scaled yield reproducibility is such thatmore » the effect of design improvements increasing yield on any given shot by at least 40% can be deemed statistically significant.« less

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1809777
Alternate Identifier(s):
OSTI ID: 1772692
Report Number(s):
LLNL-JRNL-813123
Journal ID: ISSN 1574-1818; S1574181820300331; 100755; PII: S1574181820300331
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Published Article
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Name: High Energy Density Physics Journal Volume: 36 Journal Issue: C; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma physics

Citation Formats

Landen, O. L., Casey, D. T., DiNicola, J. M., Doeppner, T., Hartouni, E. P., Hinkel, D. E., Berzak Hopkins, L. F., Hohenberger, M., Kritcher, A. L., LePape, S., MacGowan, B. J., Maclaren, S., Meaney, K. D., Millot, M., Patel, P. K., Park, J., Pickworth, L. A., Robey, H. F., Ross, J. S., Yang, S. T., Zylstra, A. B., Baker, K. L., Callahan, D. A., Celliers, P. M., Edwards, M. J., Hurricane, O. A., Lindl, J. D., Moody, J. D., Ralph, J., Smalyuk, V. A., Thomas, C. A., Van Wonterghem, B. M., and Weber, C. R. Yield and compression trends and reproducibility at NIF*. Netherlands: N. p., 2020. Web. doi:10.1016/j.hedp.2020.100755.
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Landen, O. L., Casey, D. T., DiNicola, J. M., Doeppner, T., Hartouni, E. P., Hinkel, D. E., Berzak Hopkins, L. F., Hohenberger, M., Kritcher, A. L., LePape, S., MacGowan, B. J., Maclaren, S., Meaney, K. D., Millot, M., Patel, P. K., Park, J., Pickworth, L. A., Robey, H. F., Ross, J. S., Yang, S. T., Zylstra, A. B., Baker, K. L., Callahan, D. A., Celliers, P. M., Edwards, M. J., Hurricane, O. A., Lindl, J. D., Moody, J. D., Ralph, J., Smalyuk, V. A., Thomas, C. A., Van Wonterghem, B. M., & Weber, C. R. Yield and compression trends and reproducibility at NIF*. Netherlands. https://doi.org/10.1016/j.hedp.2020.100755
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Landen, O. L., Casey, D. T., DiNicola, J. M., Doeppner, T., Hartouni, E. P., Hinkel, D. E., Berzak Hopkins, L. F., Hohenberger, M., Kritcher, A. L., LePape, S., MacGowan, B. J., Maclaren, S., Meaney, K. D., Millot, M., Patel, P. K., Park, J., Pickworth, L. A., Robey, H. F., Ross, J. S., Yang, S. T., Zylstra, A. B., Baker, K. L., Callahan, D. A., Celliers, P. M., Edwards, M. J., Hurricane, O. A., Lindl, J. D., Moody, J. D., Ralph, J., Smalyuk, V. A., Thomas, C. A., Van Wonterghem, B. M., and Weber, C. R. Sat . "Yield and compression trends and reproducibility at NIF*". Netherlands. https://doi.org/10.1016/j.hedp.2020.100755.
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@article{osti_1809777,
title = {Yield and compression trends and reproducibility at NIF*},
author = {Landen, O. L. and Casey, D. T. and DiNicola, J. M. and Doeppner, T. and Hartouni, E. P. and Hinkel, D. E. and Berzak Hopkins, L. F. and Hohenberger, M. and Kritcher, A. L. and LePape, S. and MacGowan, B. J. and Maclaren, S. and Meaney, K. D. and Millot, M. and Patel, P. K. and Park, J. and Pickworth, L. A. and Robey, H. F. and Ross, J. S. and Yang, S. T. and Zylstra, A. B. and Baker, K. L. and Callahan, D. A. and Celliers, P. M. and Edwards, M. J. and Hurricane, O. A. and Lindl, J. D. and Moody, J. D. and Ralph, J. and Smalyuk, V. A. and Thomas, C. A. and Van Wonterghem, B. M. and Weber, C. R.},
abstractNote = {The yield and fuel compression trends for the NIF indirect-drive cryogenically-layered DT implosions is empirically examined across all ablators (CH, C and Be) and design in-flight adiabats between 1.5 and 3. Higher compression is observed for a lower design adiabat. Within a design adiabat, compression increases for shorter coast implosions but only if have optimized shock timing. The sensitivity of compression to coast time appears less for higher adiabat designs. Across all designs and ablators, the best DT neutron yields follow the same 1D theoretical curve versus peak velocity, but only if normalize by capsule scale rather than fuel mass and thickness. Shots with reduced yields can be explained by having long coast time, high hot spot mix or know capsule imperfections. Repeat “Standard Candle” shock timing and gas implosions, and DT layered implosions normalized for scale and velocity, reveal adequate reproducibility in shock timing, implosion drive symmetry, compression and yield for the majority of shots. The level of reproducibility is also consistent with known uncertainties and imperfections in initial laser and capsule parameters and outputs. We thus conclude there is no evidence of a significant random unknown variable in these NIF implosions. The scaled yield reproducibility is such that the effect of design improvements increasing yield on any given shot by at least 40% can be deemed statistically significant.},
doi = {10.1016/j.hedp.2020.100755},
journal = {High Energy Density Physics},
number = C,
volume = 36,
place = {Netherlands},
year = {Sat Aug 01 00:00:00 EDT 2020},
month = {Sat Aug 01 00:00:00 EDT 2020}
}
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