The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments
Abstract
High laser energy (>1.2 MJ) implosion experiments on the National Ignition Facility show that low mode implosion symmetry is highly dependent on an expanding high-Z wall “bubble” plasma feature. The bubble is caused by the early time deposition of laser beams incident on the interior near the entrance of the cylindrical hohlraum (outer cone beams). It absorbs beams designated for the waist of the hohlraum (inner cone beams) causing a redistribution of x-ray flux on the capsule. From measurements, we are able to quantify the absorption and expansion of this bubble. Measurements show that the resulting hot spot is more oblate when there is more inner beam absorption in the bubble. We also find absorption in the bubble to be between 51 ± 3% and 62 ± 2%. This bubble absorption is found to evolve predictably as a function of the early time outer cone laser pulse fluence and the pulse length. From this, a phenomenological model of the effective drive symmetry and subsequent implosion shape is found indicating a very strong dependence of implosion shape on early time laser fluence and laser pulse duration.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1469454
- Report Number(s):
- LLNL-JRNL-738440
Journal ID: ISSN 1070-664X; 891669
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 8; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; electron density; plasmas; x-rays; tectonophysics; speed of sound; transition metals; chemical elements; hydrodynamics simulations; radiograph; nuclear fusion
Citation Formats
Ralph, J. E., Landen, O., Divol, L., Pak, A., Ma, T., Callahan, D. A., Kritcher, A. L., Döppner, T., Hinkel, D. E., Jarrott, C., Moody, J. D., Pollock, B. B., Hurricane, O., and Edwards, M. J. The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments. United States: N. p., 2018.
Web. doi:10.1063/1.5023008.
Ralph, J. E., Landen, O., Divol, L., Pak, A., Ma, T., Callahan, D. A., Kritcher, A. L., Döppner, T., Hinkel, D. E., Jarrott, C., Moody, J. D., Pollock, B. B., Hurricane, O., & Edwards, M. J. The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments. United States. doi:https://doi.org/10.1063/1.5023008
Ralph, J. E., Landen, O., Divol, L., Pak, A., Ma, T., Callahan, D. A., Kritcher, A. L., Döppner, T., Hinkel, D. E., Jarrott, C., Moody, J. D., Pollock, B. B., Hurricane, O., and Edwards, M. J. Mon .
"The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments". United States. doi:https://doi.org/10.1063/1.5023008. https://www.osti.gov/servlets/purl/1469454.
@article{osti_1469454,
title = {The influence of hohlraum dynamics on implosion symmetry in indirect drive inertial confinement fusion experiments},
author = {Ralph, J. E. and Landen, O. and Divol, L. and Pak, A. and Ma, T. and Callahan, D. A. and Kritcher, A. L. and Döppner, T. and Hinkel, D. E. and Jarrott, C. and Moody, J. D. and Pollock, B. B. and Hurricane, O. and Edwards, M. J.},
abstractNote = {High laser energy (>1.2 MJ) implosion experiments on the National Ignition Facility show that low mode implosion symmetry is highly dependent on an expanding high-Z wall “bubble” plasma feature. The bubble is caused by the early time deposition of laser beams incident on the interior near the entrance of the cylindrical hohlraum (outer cone beams). It absorbs beams designated for the waist of the hohlraum (inner cone beams) causing a redistribution of x-ray flux on the capsule. From measurements, we are able to quantify the absorption and expansion of this bubble. Measurements show that the resulting hot spot is more oblate when there is more inner beam absorption in the bubble. We also find absorption in the bubble to be between 51 ± 3% and 62 ± 2%. This bubble absorption is found to evolve predictably as a function of the early time outer cone laser pulse fluence and the pulse length. From this, a phenomenological model of the effective drive symmetry and subsequent implosion shape is found indicating a very strong dependence of implosion shape on early time laser fluence and laser pulse duration.},
doi = {10.1063/1.5023008},
journal = {Physics of Plasmas},
number = 8,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}
Web of Science
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