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Title: Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF

Abstract

Hydrodynamic instabilities and asymmetries are a major obstacle in the quest to achieve ignition at the National Ignition Facility (NIF) as they cause pre-existing capsule perturbations to grow and ultimately quench the fusion burn in experiments. This paper reviews the development of two new experimental techniques to measure high-mode instabilities and low-mode asymmetries in the deceleration phase of indirect drive inertial confinement fusion implosions. In the first innovative technique, self-emission from the hot spot was enhanced with an argon dopant to “self-backlight” the shell in-flight, imaging the perturbations in the shell near peak velocity. Experiments with pre-imposed two-dimensional perturbations showed hydrodynamic instability growth of up to 7000× in areal density. These experiments discovered unexpected three-dimensional structures originating from the capsule support structures. These new 3-D structures became one of the primary concerns for the indirect drive ICF program that requires their origin to be understood and their impact mitigated. In a second complementary technique, the inner surface of the decelerating shell was visualized in implosions using x-ray emission of a high-Z dopant added to the inner surface of the capsule. With this technique, low mode asymmetry and high mode perturbations, including perturbations seeded by the gas fill tube and capsulemore » support structure, were quantified near peak compression. Using this doping method, the role of perturbations and radiative losses from high atomic number materials on neutron yield was quantified.« less

Authors:
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+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1512596
Alternate Identifier(s):
OSTI ID: 1464586
Report Number(s):
LLNL-JRNL-750655
Journal ID: ISSN 1070-664X; 935989
Grant/Contract Number:  
AC52-07NA27344; NA0001808
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

Citation Formats

Pickworth, L. A., Hammel, B. A., Smalyuk, V. A., Robey, H. F., Tommasini, R., Benedetti, L. R., Berzak Hopkins, L., Bradley, D. K., Dayton, M., Felker, S., Field, J. E., Haan, S. W., Haid, B., Hatarik, R., Hartouni, E., Holunga, D., Hoppe, M., Izumi, N., Johnson, S., Khan, S., Kohut, T., Lahmann, B., Landen, O. L., LePape, S., MacPhee, A. G., Marley, E., Meezan, N. B., Milovich, J., Nagel, S. R., Nikroo, A., Pak, A. E., Petrasso, R., Remington, B. A., Rice, N. G., Scott, H. A., Springer, P. T., Stadermann, M., Walters, C., Widmann, K., and Hsing, W. W. Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF. United States: N. p., 2018. Web. doi:10.1063/1.5039744.
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Pickworth, L. A., Hammel, B. A., Smalyuk, V. A., Robey, H. F., Tommasini, R., Benedetti, L. R., Berzak Hopkins, L., Bradley, D. K., Dayton, M., Felker, S., Field, J. E., Haan, S. W., Haid, B., Hatarik, R., Hartouni, E., Holunga, D., Hoppe, M., Izumi, N., Johnson, S., Khan, S., Kohut, T., Lahmann, B., Landen, O. L., LePape, S., MacPhee, A. G., Marley, E., Meezan, N. B., Milovich, J., Nagel, S. R., Nikroo, A., Pak, A. E., Petrasso, R., Remington, B. A., Rice, N. G., Scott, H. A., Springer, P. T., Stadermann, M., Walters, C., Widmann, K., & Hsing, W. W. Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF. United States. https://doi.org/10.1063/1.5039744
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Pickworth, L. A., Hammel, B. A., Smalyuk, V. A., Robey, H. F., Tommasini, R., Benedetti, L. R., Berzak Hopkins, L., Bradley, D. K., Dayton, M., Felker, S., Field, J. E., Haan, S. W., Haid, B., Hatarik, R., Hartouni, E., Holunga, D., Hoppe, M., Izumi, N., Johnson, S., Khan, S., Kohut, T., Lahmann, B., Landen, O. L., LePape, S., MacPhee, A. G., Marley, E., Meezan, N. B., Milovich, J., Nagel, S. R., Nikroo, A., Pak, A. E., Petrasso, R., Remington, B. A., Rice, N. G., Scott, H. A., Springer, P. T., Stadermann, M., Walters, C., Widmann, K., and Hsing, W. W. Tue . "Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF". United States. https://doi.org/10.1063/1.5039744. https://www.osti.gov/servlets/purl/1512596.
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@article{osti_1512596,
title = {Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF},
author = {Pickworth, L. A. and Hammel, B. A. and Smalyuk, V. A. and Robey, H. F. and Tommasini, R. and Benedetti, L. R. and Berzak Hopkins, L. and Bradley, D. K. and Dayton, M. and Felker, S. and Field, J. E. and Haan, S. W. and Haid, B. and Hatarik, R. and Hartouni, E. and Holunga, D. and Hoppe, M. and Izumi, N. and Johnson, S. and Khan, S. and Kohut, T. and Lahmann, B. and Landen, O. L. and LePape, S. and MacPhee, A. G. and Marley, E. 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 Scott, H. A. and Springer, P. T. and Stadermann, M. and Walters, C. and Widmann, K. and Hsing, W. W.},
abstractNote = {Hydrodynamic instabilities and asymmetries are a major obstacle in the quest to achieve ignition at the National Ignition Facility (NIF) as they cause pre-existing capsule perturbations to grow and ultimately quench the fusion burn in experiments. This paper reviews the development of two new experimental techniques to measure high-mode instabilities and low-mode asymmetries in the deceleration phase of indirect drive inertial confinement fusion implosions. In the first innovative technique, self-emission from the hot spot was enhanced with an argon dopant to “self-backlight” the shell in-flight, imaging the perturbations in the shell near peak velocity. Experiments with pre-imposed two-dimensional perturbations showed hydrodynamic instability growth of up to 7000× in areal density. These experiments discovered unexpected three-dimensional structures originating from the capsule support structures. These new 3-D structures became one of the primary concerns for the indirect drive ICF program that requires their origin to be understood and their impact mitigated. In a second complementary technique, the inner surface of the decelerating shell was visualized in implosions using x-ray emission of a high-Z dopant added to the inner surface of the capsule. With this technique, low mode asymmetry and high mode perturbations, including perturbations seeded by the gas fill tube and capsule support structure, were quantified near peak compression. Using this doping method, the role of perturbations and radiative losses from high atomic number materials on neutron yield was quantified.},
doi = {10.1063/1.5039744},
journal = {Physics of Plasmas},
number = 8,
volume = 25,
place = {United States},
year = {Tue Aug 14 00:00:00 EDT 2018},
month = {Tue Aug 14 00:00:00 EDT 2018}
}
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    Works referencing / citing this record:

    Modeling of direct-drive cylindrical implosion experiments with an Eulerian radiation-hydrodynamics code
    journal, April 2019

    • Sauppe, J. P.; Haines, B. M.; Palaniyappan, S.
    • Physics of Plasmas, Vol. 26, Issue 4
    • DOI: 10.1063/1.5083851
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