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Title: Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF

Abstract

Measurements of yield, ion temperature, areal density (rhoR), shell convergence, and bang time have been obtained in shock-driven, D2 and D3He gas-filled “exploding-pusher” inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF) to assess the impact of ion kinetic effects. These measurements probed the shock convergence phase of ICF implosions, a critical stage in hot-spot ignition experiments. The data complement previous studies of kinetic effects in shock-driven implosions. Ion temperature and fuel rhoR inferred from fusion-product spectroscopy are used to estimate the ion-ion mean free path in the gas. A trend of decreasing yields relative to the predictions of 2D draco hydrodynamics simulations with increasing Knudsen number (the ratio of ion-ion mean free path to minimum shell radius) suggests that ion kinetic effects are increasingly impacting the hot fuel region, in general agreement with previous results. The long mean free path conditions giving rise to ion kinetic effects in the gas are often prevalent during the shock phase of both exploding pushers and ablatively-driven implosions, including ignition-relevant implosions.

Authors:
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  1. OSTI
Publication Date:
DOE Contract Number:  
NA0001857
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1880971
DOI:
https://doi.org/10.7910/DVN/T0ZRRO

Citation Formats

Rosenberg, M. J., Zylstra, A. B., Séguin, F. H., Rinderknecht, H. G., Frenje, J. A., Johnson, M. Gatu, Sio, H., Waugh, C. J., Sinenian, N., Li, C. K., Petrasso, R. D., McKenty, P. W., Hohenberger, M., Radha, P. B., Delettrez, J. A., Glebov, V. Yu., Betti, R., Goncharov, V. N., Knauer, J. P., Sangster, T. C., LePape, S., Mackinnon, A. J., Pino, J., McNaney, J. M., Rygg, J. R., Amendt, P. A., Bellei, C., Benedetti, L. R., Hopkins, L. Berzak, Bionta, R. M., Casey, D. T., Divol, L., Edwards, M. J., Glenn, S., Glenzer, S. H., Hicks, D. G., Kimbrough, J. R., Landen, O. L., Lindl, J. D., Ma, T., MacPhee, A., Meezan, N. B., Moody, J. D., Moran, M. J., Park, H.-S., Remington, B. A., Robey, H., Rosen, M. D., Wilks, S. C., Zacharias, R. A., Herrmann, H. W., Hoffman, N. M., Kyrala, G. A., Leeper, R. J., Olson, R. E., Kilkenny, J. D., and Nikroo, A. Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF. United States: N. p., 2019. Web. doi:10.7910/DVN/T0ZRRO.
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Rosenberg, M. J., Zylstra, A. B., Séguin, F. H., Rinderknecht, H. G., Frenje, J. A., Johnson, M. Gatu, Sio, H., Waugh, C. J., Sinenian, N., Li, C. K., Petrasso, R. D., McKenty, P. W., Hohenberger, M., Radha, P. B., Delettrez, J. A., Glebov, V. Yu., Betti, R., Goncharov, V. N., Knauer, J. P., Sangster, T. C., LePape, S., Mackinnon, A. J., Pino, J., McNaney, J. M., Rygg, J. R., Amendt, P. A., Bellei, C., Benedetti, L. R., Hopkins, L. Berzak, Bionta, R. M., Casey, D. T., Divol, L., Edwards, M. J., Glenn, S., Glenzer, S. H., Hicks, D. G., Kimbrough, J. R., Landen, O. L., Lindl, J. D., Ma, T., MacPhee, A., Meezan, N. B., Moody, J. D., Moran, M. J., Park, H.-S., Remington, B. A., Robey, H., Rosen, M. D., Wilks, S. C., Zacharias, R. A., Herrmann, H. W., Hoffman, N. M., Kyrala, G. A., Leeper, R. J., Olson, R. E., Kilkenny, J. D., & Nikroo, A. Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF. United States. doi:https://doi.org/10.7910/DVN/T0ZRRO
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Rosenberg, M. J., Zylstra, A. B., Séguin, F. H., Rinderknecht, H. G., Frenje, J. A., Johnson, M. Gatu, Sio, H., Waugh, C. J., Sinenian, N., Li, C. K., Petrasso, R. D., McKenty, P. W., Hohenberger, M., Radha, P. B., Delettrez, J. A., Glebov, V. Yu., Betti, R., Goncharov, V. N., Knauer, J. P., Sangster, T. C., LePape, S., Mackinnon, A. J., Pino, J., McNaney, J. M., Rygg, J. R., Amendt, P. A., Bellei, C., Benedetti, L. R., Hopkins, L. Berzak, Bionta, R. M., Casey, D. T., Divol, L., Edwards, M. J., Glenn, S., Glenzer, S. H., Hicks, D. G., Kimbrough, J. R., Landen, O. L., Lindl, J. D., Ma, T., MacPhee, A., Meezan, N. B., Moody, J. D., Moran, M. J., Park, H.-S., Remington, B. A., Robey, H., Rosen, M. D., Wilks, S. C., Zacharias, R. A., Herrmann, H. W., Hoffman, N. M., Kyrala, G. A., Leeper, R. J., Olson, R. E., Kilkenny, J. D., and Nikroo, A. 2019. "Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF". United States. doi:https://doi.org/10.7910/DVN/T0ZRRO. https://www.osti.gov/servlets/purl/1880971. Pub date:Wed Jan 09 23:00:00 EST 2019
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@article{osti_1880971,
title = {Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF},
author = {Rosenberg, M. J. and Zylstra, A. B. and Séguin, F. H. and Rinderknecht, H. G. and Frenje, J. A. and Johnson, M. Gatu and Sio, H. and Waugh, C. J. and Sinenian, N. and Li, C. K. and Petrasso, R. D. and McKenty, P. W. and Hohenberger, M. and Radha, P. B. and Delettrez, J. A. and Glebov, V. Yu. and Betti, R. and Goncharov, V. N. and Knauer, J. P. and Sangster, T. C. and LePape, S. and Mackinnon, A. J. and Pino, J. and McNaney, J. M. and Rygg, J. R. and Amendt, P. A. and Bellei, C. and Benedetti, L. R. and Hopkins, L. Berzak and Bionta, R. M. and Casey, D. T. and Divol, L. and Edwards, M. J. and Glenn, S. and Glenzer, S. H. and Hicks, D. G. and Kimbrough, J. R. and Landen, O. L. and Lindl, J. D. and Ma, T. and MacPhee, A. and Meezan, N. B. and Moody, J. D. and Moran, M. J. and Park, H.-S. and Remington, B. A. and Robey, H. and Rosen, M. D. and Wilks, S. C. and Zacharias, R. A. and Herrmann, H. W. and Hoffman, N. M. and Kyrala, G. A. and Leeper, R. J. and Olson, R. E. and Kilkenny, J. D. and Nikroo, A.},
abstractNote = {Measurements of yield, ion temperature, areal density (rhoR), shell convergence, and bang time have been obtained in shock-driven, D2 and D3He gas-filled “exploding-pusher” inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF) to assess the impact of ion kinetic effects. These measurements probed the shock convergence phase of ICF implosions, a critical stage in hot-spot ignition experiments. The data complement previous studies of kinetic effects in shock-driven implosions. Ion temperature and fuel rhoR inferred from fusion-product spectroscopy are used to estimate the ion-ion mean free path in the gas. A trend of decreasing yields relative to the predictions of 2D draco hydrodynamics simulations with increasing Knudsen number (the ratio of ion-ion mean free path to minimum shell radius) suggests that ion kinetic effects are increasingly impacting the hot fuel region, in general agreement with previous results. The long mean free path conditions giving rise to ion kinetic effects in the gas are often prevalent during the shock phase of both exploding pushers and ablatively-driven implosions, including ignition-relevant implosions.},
doi = {10.7910/DVN/T0ZRRO},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}
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DOI: https://doi.org/10.7910/DVN/T0ZRRO
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