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Title: Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA

Abstract

Reaching ignition in direct-drive (DD) inertial confinement fusion implosions requires achieving central pressures in excess of 100 Gbar. The OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] is used to study the physics of implosions that are hydrodynamically equivalent to the ignition designs on the National Ignition Facility (NIF) [J. A. Paisner et al., Laser Focus World 30, 75 (1994)]. It is shown that the highest hot-spot pressures (up to 40 Gbar) are achieved in target designs with a fuel adiabat of α ≃ 4, an implosion velocity of 3.8 × 10{sup 7} cm/s, and a laser intensity of ∼10{sup 15} W/cm{sup 2}. These moderate-adiabat implosions are well understood using two-dimensional hydrocode simulations. The performance of lower-adiabat implosions is significantly degraded relative to code predictions, a common feature between DD implosions on OMEGA and indirect-drive cryogenic implosions on the NIF. Simplified theoretical models are developed to gain physical understanding of the implosion dynamics that dictate the target performance. These models indicate that degradations in the shell density and integrity (caused by hydrodynamic instabilities during the target acceleration) coupled with hydrodynamics at stagnation are the main failure mechanisms in low-adiabat designs. To demonstrate ignition hydrodynamic equivalence in cryogenic implosions onmore » OMEGA, the target-design robustness to hydrodynamic instability growth must be improved by reducing laser-coupling losses caused by cross beam energy transfer.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] more »; « less
  1. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
22300190
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAMS; DEUTERIUM; ENERGY TRANSFER; GAIN; GLOBAL ASPECTS; HYDRODYNAMICS; IMPLOSIONS; INERTIAL CONFINEMENT; LASERS; PERFORMANCE; PLASMA INSTABILITY; SIMULATION; THERMONUCLEAR IGNITION; TRITIUM; US NATIONAL IGNITION FACILITY; VELOCITY

Citation Formats

Goncharov, V. N., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Glebov, V. Yu., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., Kelly, J. H., and others, and. Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA. United States: N. p., 2014. Web. doi:10.1063/1.4876618.
Goncharov, V. N., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Glebov, V. Yu., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., Kelly, J. H., & others, and. Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA. United States. https://doi.org/10.1063/1.4876618
Goncharov, V. N., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Glebov, V. Yu., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., Kelly, J. H., and others, and. Thu . "Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA". United States. https://doi.org/10.1063/1.4876618.
@article{osti_22300190,
title = {Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA},
author = {Goncharov, V. N. and Sangster, T. C. and Betti, R. and Boehly, T. R. and Bonino, M. J. and Collins, T. J. B. and Craxton, R. S. and Delettrez, J. A. and Edgell, D. H. and Epstein, R. and Follett, R. K. and Forrest, C. J. and Froula, D. H. and Glebov, V. Yu. and Harding, D. R. and Henchen, R. J. and Hu, S. X. and Igumenshchev, I. V. and Janezic, R. and Kelly, J. H. and others, and},
abstractNote = {Reaching ignition in direct-drive (DD) inertial confinement fusion implosions requires achieving central pressures in excess of 100 Gbar. The OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] is used to study the physics of implosions that are hydrodynamically equivalent to the ignition designs on the National Ignition Facility (NIF) [J. A. Paisner et al., Laser Focus World 30, 75 (1994)]. It is shown that the highest hot-spot pressures (up to 40 Gbar) are achieved in target designs with a fuel adiabat of α ≃ 4, an implosion velocity of 3.8 × 10{sup 7} cm/s, and a laser intensity of ∼10{sup 15} W/cm{sup 2}. These moderate-adiabat implosions are well understood using two-dimensional hydrocode simulations. The performance of lower-adiabat implosions is significantly degraded relative to code predictions, a common feature between DD implosions on OMEGA and indirect-drive cryogenic implosions on the NIF. Simplified theoretical models are developed to gain physical understanding of the implosion dynamics that dictate the target performance. These models indicate that degradations in the shell density and integrity (caused by hydrodynamic instabilities during the target acceleration) coupled with hydrodynamics at stagnation are the main failure mechanisms in low-adiabat designs. To demonstrate ignition hydrodynamic equivalence in cryogenic implosions on OMEGA, the target-design robustness to hydrodynamic instability growth must be improved by reducing laser-coupling losses caused by cross beam energy transfer.},
doi = {10.1063/1.4876618},
url = {https://www.osti.gov/biblio/22300190}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 21,
place = {United States},
year = {2014},
month = {5}
}