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Title: 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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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. General Atomics, San Diego, 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:
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. 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., 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. doi: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 = {2018},
month = {5}
}

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Works referenced in this record:

Laser Compression of Matter to Super-High Densities: Thermonuclear (CTR) Applications
journal, September 1972

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