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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 × 10⁷ cm/s, and a laser intensity of ~10¹⁵ W/cm². 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 implosionsmore » on 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];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1] more »;  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [3] « less
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1172492
DOE Contract Number:  
NA0002035
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; 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

Goncharov, V. N., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Yu. Glebov, V., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., Kelly, J. H., Kessler, T. J., Kosc, T. Z., Loucks, S. J., Marozas, J. A., Marshall, F. J., Maximov, A. V., McCrory, R. L., McKenty, P. W., Meyerhofer, D. D., Michel, D. T., Myatt, J. F., Nora, R., Radha, P. B., Regan, S. P., Seka, W., Shmayda, W. T., Short, R.W., Shvydky, A., Skupsky, S., Stoeckl, C., Yaakobi, B., Frenje, J. A., Gatu-Johnson, M., Petrasso, R. D., and Casey, D. T.. 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., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Yu. Glebov, V., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., Kelly, J. H., Kessler, T. J., Kosc, T. Z., Loucks, S. J., Marozas, J. A., Marshall, F. J., Maximov, A. V., McCrory, R. L., McKenty, P. W., Meyerhofer, D. D., Michel, D. T., Myatt, J. F., Nora, R., Radha, P. B., Regan, S. P., Seka, W., Shmayda, W. T., Short, R.W., Shvydky, A., Skupsky, S., Stoeckl, C., Yaakobi, B., Frenje, J. A., Gatu-Johnson, M., Petrasso, R. D., & Casey, D. T.. 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., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Yu. Glebov, V., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., Kelly, J. H., Kessler, T. J., Kosc, T. Z., Loucks, S. J., Marozas, J. A., Marshall, F. J., Maximov, A. V., McCrory, R. L., McKenty, P. W., Meyerhofer, D. D., Michel, D. T., Myatt, J. F., Nora, R., Radha, P. B., Regan, S. P., Seka, W., Shmayda, W. T., Short, R.W., Shvydky, A., Skupsky, S., Stoeckl, C., Yaakobi, B., Frenje, J. A., Gatu-Johnson, M., Petrasso, R. D., and Casey, D. T.. 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_1172492,
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. 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 Yu. Glebov, V. and Harding, D. R. and Henchen, R. J. and Hu, S. X. and Igumenshchev, I. V. and Janezic, R. and Kelly, J. H. and Kessler, T. J. and Kosc, T. Z. and Loucks, S. J. and Marozas, J. A. and Marshall, F. J. and Maximov, A. V. and McCrory, R. L. and McKenty, P. W. and Meyerhofer, D. D. and Michel, D. T. and Myatt, J. F. and Nora, R. and Radha, P. B. and Regan, S. P. and Seka, W. and Shmayda, W. T. and Short, R.W. and Shvydky, A. and Skupsky, S. and Stoeckl, C. and Yaakobi, B. and Frenje, J. A. and Gatu-Johnson, M. and Petrasso, R. D. and Casey, D. T.},
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 × 10⁷ cm/s, and a laser intensity of ~10¹⁵ W/cm². 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/1172492}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 21,
place = {United States},
year = {2014},
month = {5}
}