Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility
Abstract
High-mode perturbations and low-mode asymmetries were measured in the deceleration phase of indirectly-driven, deuterium gas filled inertial confinement fusion (ICF) capsule implosions at convergence ratios of 10 to 15, using a new “enhanced emission” technique at the National Ignition Facility (NIF) [E. M. Campbell, R. Cauble, and B. A. Remington, AIP Conf. Proc. 429, 3 (1998)]. In these experiments, a high spatial resolution Kirkpatrick-Baez microscope was used to image the x-ray emission from the inner surface of a high-density-carbon (HDC) capsule’s shell. Use of a high atomic number dopant in the shell enabled time-resolved observations of shell perturbations penetrating into the hot spot. This allowed the effects of the perturbations and asymmetries on degrading neutron yield to be directly measured. In particular, mix induced radiation losses of ~400 J from the hot spot resulted in a neutron yield reduction of a factor of ~2. In a subsequent experiment with a significantly increased level of short-mode initial perturbations, shown through the enhanced imaging technique to be highly organized radially, the neutron yield dropped an additional factor of ~2.
- Authors:
-
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- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1491653
- Alternate Identifier(s):
- OSTI ID: 1435865
- Report Number(s):
- LLNL-JRNL-742398
Journal ID: ISSN 1070-664X; 897098
- Grant/Contract Number:
- AC52-07NA27344; NA0001808
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 5; 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
Citation Formats
Pickworth, L. A., Hammel, B. A., Smalyuk, V. A., Robey, H. F., Benedetti, L. R., Berzak Hopkins, L., Bradley, D. K., Field, J. E., Haan, S. W., Hatarik, R., Hartouni, E., Izumi, N., Johnson, S., Khan, S., Lahmann, B., Landen, O. L., Le Pape, S., MacPhee, A. G., Meezan, N. B., Milovich, J., Nagel, S. R., Nikroo, A., Pak, A. E., Petrasso, R., Remington, B. A., Rice, N. G., Springer, P. T., Stadermann, M., Widmann, K., and Hsing, W. Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility. United States: N. p., 2018.
Web. doi:10.1063/1.5025188.
Pickworth, L. A., Hammel, B. A., Smalyuk, V. A., Robey, H. F., Benedetti, L. R., Berzak Hopkins, L., Bradley, D. K., Field, J. E., Haan, S. W., Hatarik, R., Hartouni, E., Izumi, N., Johnson, S., Khan, S., Lahmann, B., Landen, O. L., Le Pape, S., MacPhee, A. G., Meezan, N. B., Milovich, J., Nagel, S. R., Nikroo, A., Pak, A. E., Petrasso, R., Remington, B. A., Rice, N. G., Springer, P. T., Stadermann, M., Widmann, K., & Hsing, W. Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility. United States. https://doi.org/10.1063/1.5025188
Pickworth, L. A., Hammel, B. A., Smalyuk, V. A., Robey, H. F., Benedetti, L. R., Berzak Hopkins, L., Bradley, D. K., Field, J. E., Haan, S. W., Hatarik, R., Hartouni, E., Izumi, N., Johnson, S., Khan, S., Lahmann, B., Landen, O. L., Le Pape, S., MacPhee, A. G., Meezan, N. B., Milovich, J., Nagel, S. R., Nikroo, A., Pak, A. E., Petrasso, R., Remington, B. A., Rice, N. G., Springer, P. T., Stadermann, M., Widmann, K., and Hsing, W. Thu .
"Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility". United States. https://doi.org/10.1063/1.5025188. https://www.osti.gov/servlets/purl/1491653.
@article{osti_1491653,
title = {Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility},
author = {Pickworth, L. A. and Hammel, B. A. and Smalyuk, V. A. and Robey, H. F. and Benedetti, L. R. and Berzak Hopkins, L. and Bradley, D. K. and Field, J. E. and Haan, S. W. and Hatarik, R. and Hartouni, E. and Izumi, N. and Johnson, S. and Khan, S. and Lahmann, B. and Landen, O. L. and Le Pape, S. and MacPhee, A. G. and Meezan, N. B. and Milovich, J. and Nagel, S. R. and Nikroo, A. and Pak, A. E. and Petrasso, R. and Remington, B. A. and Rice, N. G. and Springer, P. T. and Stadermann, M. and Widmann, K. and Hsing, W.},
abstractNote = {High-mode perturbations and low-mode asymmetries were measured in the deceleration phase of indirectly-driven, deuterium gas filled inertial confinement fusion (ICF) capsule implosions at convergence ratios of 10 to 15, using a new “enhanced emission” technique at the National Ignition Facility (NIF) [E. M. Campbell, R. Cauble, and B. A. Remington, AIP Conf. Proc. 429, 3 (1998)]. In these experiments, a high spatial resolution Kirkpatrick-Baez microscope was used to image the x-ray emission from the inner surface of a high-density-carbon (HDC) capsule’s shell. Use of a high atomic number dopant in the shell enabled time-resolved observations of shell perturbations penetrating into the hot spot. This allowed the effects of the perturbations and asymmetries on degrading neutron yield to be directly measured. In particular, mix induced radiation losses of ~400 J from the hot spot resulted in a neutron yield reduction of a factor of ~2. In a subsequent experiment with a significantly increased level of short-mode initial perturbations, shown through the enhanced imaging technique to be highly organized radially, the neutron yield dropped an additional factor of ~2.},
doi = {10.1063/1.5025188},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {Thu May 03 00:00:00 EDT 2018},
month = {Thu May 03 00:00:00 EDT 2018}
}
Web of Science
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