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Title: Mitigation of mode-one asymmetry in laser-direct-drive inertial confinement fusion implosions

Abstract

Nonuniformities present in the laser illumination and target in laser-driven inertial confinement fusion experiments lead to an asymmetric compression of the target, resulting in an inefficient conversion of shell kinetic energy to thermal energy of the hot-spot plasma. In this paper, the effects of asymmetric compression of cryogenic deuterium tritium laser-direct-drive implosions are examined using a suite of nuclear and x-ray diagnostics on the OMEGA laser. The neutron-averaged hot-spot velocity (~uhs) and apparent ion temperature (Ti) asymmetry are determined from neutron time-of-flight measurements of the primary deuterium tritium fusion neutron energy spectrum, while the areal density (rhoR) of the compressed fuel surrounding the hot spot is inferred from measurements of the scattered neutron energy spectrum. The low-mode perturbations of the hot-spot shape are characterized from x-ray self-emission images recorded along three quasi-orthogonal lines of sight. Implosions with significant mode-1 laser drive asymmetries show large hot-spot velocities (>100 km/s) in a direction consistent with the hot-spot elongation observed in x-ray images, measured Ti asymmetry, and rhoR asymmetry. Laser drive corrections have been applied through shifting the initial target location in order to mitigate the observed asymmetry. With the asymmetry corrected, a more-symmetric hot spot is observed with reduced ~uhs, Ti asymmetry,more » rhoR asymmetry, and a 30% increase in the fusion yield.« less

Authors:
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Publication Date:
DOE Contract Number:  
NA0003856
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1887853
DOI:
https://doi.org/10.7910/DVN/JXSDJV

Citation Formats

Mannion, O. M., Igumenshchev, I. V., Anderson, K. S., Betti, R., Campbell, E. M., Cao, D., Forrest, C. J., Gatu Johnson, M., Glebov, V. Yu., Goncharov, V. N., Gopalaswamy, V., Ivancic, S. T., Jacobs-Perkins, D. W., Kalb, A., Knauer, J. P., Kwiatkowski, J., Lees, A., Marshall, F. J., Michalko, M., Mohamed, Z. L., Patel, D., Rinderknecht, H. G., Shah, R. C., Stoeckl, C., Theobald, W., Woo, K. M., and Regan, S. P. Mitigation of mode-one asymmetry in laser-direct-drive inertial confinement fusion implosions. United States: N. p., 2021. Web. doi:10.7910/DVN/JXSDJV.
Mannion, O. M., Igumenshchev, I. V., Anderson, K. S., Betti, R., Campbell, E. M., Cao, D., Forrest, C. J., Gatu Johnson, M., Glebov, V. Yu., Goncharov, V. N., Gopalaswamy, V., Ivancic, S. T., Jacobs-Perkins, D. W., Kalb, A., Knauer, J. P., Kwiatkowski, J., Lees, A., Marshall, F. J., Michalko, M., Mohamed, Z. L., Patel, D., Rinderknecht, H. G., Shah, R. C., Stoeckl, C., Theobald, W., Woo, K. M., & Regan, S. P. Mitigation of mode-one asymmetry in laser-direct-drive inertial confinement fusion implosions. United States. doi:https://doi.org/10.7910/DVN/JXSDJV
Mannion, O. M., Igumenshchev, I. V., Anderson, K. S., Betti, R., Campbell, E. M., Cao, D., Forrest, C. J., Gatu Johnson, M., Glebov, V. Yu., Goncharov, V. N., Gopalaswamy, V., Ivancic, S. T., Jacobs-Perkins, D. W., Kalb, A., Knauer, J. P., Kwiatkowski, J., Lees, A., Marshall, F. J., Michalko, M., Mohamed, Z. L., Patel, D., Rinderknecht, H. G., Shah, R. C., Stoeckl, C., Theobald, W., Woo, K. M., and Regan, S. P. 2021. "Mitigation of mode-one asymmetry in laser-direct-drive inertial confinement fusion implosions". United States. doi:https://doi.org/10.7910/DVN/JXSDJV. https://www.osti.gov/servlets/purl/1887853. Pub date:Wed Apr 07 00:00:00 EDT 2021
@article{osti_1887853,
title = {Mitigation of mode-one asymmetry in laser-direct-drive inertial confinement fusion implosions},
author = {Mannion, O. M. and Igumenshchev, I. V. and Anderson, K. S. and Betti, R. and Campbell, E. M. and Cao, D. and Forrest, C. J. and Gatu Johnson, M. and Glebov, V. Yu. and Goncharov, V. N. and Gopalaswamy, V. and Ivancic, S. T. and Jacobs-Perkins, D. W. and Kalb, A. and Knauer, J. P. and Kwiatkowski, J. and Lees, A. and Marshall, F. J. and Michalko, M. and Mohamed, Z. L. and Patel, D. and Rinderknecht, H. G. and Shah, R. C. and Stoeckl, C. and Theobald, W. and Woo, K. M. and Regan, S. P.},
abstractNote = {Nonuniformities present in the laser illumination and target in laser-driven inertial confinement fusion experiments lead to an asymmetric compression of the target, resulting in an inefficient conversion of shell kinetic energy to thermal energy of the hot-spot plasma. In this paper, the effects of asymmetric compression of cryogenic deuterium tritium laser-direct-drive implosions are examined using a suite of nuclear and x-ray diagnostics on the OMEGA laser. The neutron-averaged hot-spot velocity (~uhs) and apparent ion temperature (Ti) asymmetry are determined from neutron time-of-flight measurements of the primary deuterium tritium fusion neutron energy spectrum, while the areal density (rhoR) of the compressed fuel surrounding the hot spot is inferred from measurements of the scattered neutron energy spectrum. The low-mode perturbations of the hot-spot shape are characterized from x-ray self-emission images recorded along three quasi-orthogonal lines of sight. Implosions with significant mode-1 laser drive asymmetries show large hot-spot velocities (>100 km/s) in a direction consistent with the hot-spot elongation observed in x-ray images, measured Ti asymmetry, and rhoR asymmetry. Laser drive corrections have been applied through shifting the initial target location in order to mitigate the observed asymmetry. With the asymmetry corrected, a more-symmetric hot spot is observed with reduced ~uhs, Ti asymmetry, rhoR asymmetry, and a 30% increase in the fusion yield.},
doi = {10.7910/DVN/JXSDJV},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {4}
}

Works referencing / citing this record:

Mitigation of mode-one asymmetry in laser-direct-drive inertial confinement fusion implosions
journal, April 2021