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Title: Design of indirectly driven, high-compression Inertial Confinement Fusion implosions with improved hydrodynamic stability using a 4-shock adiabat-shaped drive

Abstract

Experimental results from indirectly driven ignition implosions during the National Ignition Campaign (NIC) [M. J. Edwards et al., Phys. Plasmas 20, 070501 (2013)] achieved a record compression of the central deuterium-tritium fuel layer with measured areal densities up to 1.2 g/cm{sup 2}, but with significantly lower total neutron yields (between 1.5 × 10{sup 14} and 5.5 × 10{sup 14}) than predicted, approximately 10% of the 2D simulated yield. An order of magnitude improvement in the neutron yield was subsequently obtained in the “high-foot” experiments [O. A. Hurricane et al., Nature 506, 343 (2014)]. However, this yield was obtained at the expense of fuel compression due to deliberately higher fuel adiabat. In this paper, the design of an adiabat-shaped implosion is presented, in which the laser pulse is tailored to achieve similar resistance to ablation-front instability growth, but with a low fuel adiabat to achieve high compression. Comparison with measured performance shows a factor of 3–10× improvement in the neutron yield (>40% of predicted simulated yield) over similar NIC implosions, while maintaining a reasonable fuel compression of >1 g/cm{sup 2}. Extension of these designs to higher laser power and energy is discussed to further explore the trade-off between increased implosion velocity and themore » deleterious effects of hydrodynamic instabilities.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22489935
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; COMPRESSION; DENSITY; D-T OPERATION; IMPLOSIONS; INERTIAL CONFINEMENT; LASER RADIATION; NEUTRONS; PLASMA INSTABILITY; PULSES; THERMONUCLEAR FUELS; TWO-DIMENSIONAL CALCULATIONS; US NATIONAL IGNITION FACILITY; YIELDS

Citation Formats

Milovich, J. L., E-mail: milovich1@llnl.gov, Robey, H. F., Clark, D. S., Baker, K. L., Casey, D. T., Cerjan, C., Field, J., MacPhee, A. G., Pak, A., Patel, P. K., Peterson, J. L., Smalyuk, V. A., and Weber, C. R.. Design of indirectly driven, high-compression Inertial Confinement Fusion implosions with improved hydrodynamic stability using a 4-shock adiabat-shaped drive. United States: N. p., 2015. Web. doi:10.1063/1.4935922.
Milovich, J. L., E-mail: milovich1@llnl.gov, Robey, H. F., Clark, D. S., Baker, K. L., Casey, D. T., Cerjan, C., Field, J., MacPhee, A. G., Pak, A., Patel, P. K., Peterson, J. L., Smalyuk, V. A., & Weber, C. R.. Design of indirectly driven, high-compression Inertial Confinement Fusion implosions with improved hydrodynamic stability using a 4-shock adiabat-shaped drive. United States. doi:10.1063/1.4935922.
Milovich, J. L., E-mail: milovich1@llnl.gov, Robey, H. F., Clark, D. S., Baker, K. L., Casey, D. T., Cerjan, C., Field, J., MacPhee, A. G., Pak, A., Patel, P. K., Peterson, J. L., Smalyuk, V. A., and Weber, C. R.. Tue . "Design of indirectly driven, high-compression Inertial Confinement Fusion implosions with improved hydrodynamic stability using a 4-shock adiabat-shaped drive". United States. doi:10.1063/1.4935922.
@article{osti_22489935,
title = {Design of indirectly driven, high-compression Inertial Confinement Fusion implosions with improved hydrodynamic stability using a 4-shock adiabat-shaped drive},
author = {Milovich, J. L., E-mail: milovich1@llnl.gov and Robey, H. F. and Clark, D. S. and Baker, K. L. and Casey, D. T. and Cerjan, C. and Field, J. and MacPhee, A. G. and Pak, A. and Patel, P. K. and Peterson, J. L. and Smalyuk, V. A. and Weber, C. R.},
abstractNote = {Experimental results from indirectly driven ignition implosions during the National Ignition Campaign (NIC) [M. J. Edwards et al., Phys. Plasmas 20, 070501 (2013)] achieved a record compression of the central deuterium-tritium fuel layer with measured areal densities up to 1.2 g/cm{sup 2}, but with significantly lower total neutron yields (between 1.5 × 10{sup 14} and 5.5 × 10{sup 14}) than predicted, approximately 10% of the 2D simulated yield. An order of magnitude improvement in the neutron yield was subsequently obtained in the “high-foot” experiments [O. A. Hurricane et al., Nature 506, 343 (2014)]. However, this yield was obtained at the expense of fuel compression due to deliberately higher fuel adiabat. In this paper, the design of an adiabat-shaped implosion is presented, in which the laser pulse is tailored to achieve similar resistance to ablation-front instability growth, but with a low fuel adiabat to achieve high compression. Comparison with measured performance shows a factor of 3–10× improvement in the neutron yield (>40% of predicted simulated yield) over similar NIC implosions, while maintaining a reasonable fuel compression of >1 g/cm{sup 2}. Extension of these designs to higher laser power and energy is discussed to further explore the trade-off between increased implosion velocity and the deleterious effects of hydrodynamic instabilities.},
doi = {10.1063/1.4935922},
journal = {Physics of Plasmas},
number = 12,
volume = 22,
place = {United States},
year = {Tue Dec 15 00:00:00 EST 2015},
month = {Tue Dec 15 00:00:00 EST 2015}
}