Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA

Igumenshchev, I. V.; Goncharov, V. N.; Marshall, F. J.; Knauer, J. P.; Campbell, E. M.; Forrest, C. J.; Froula, D. H.; Glebov, V. Yu.; McCrory, R. L.; Regan, S. P.; Sangster, T. C.; Skupsky, S.; Stoeckl, C.

doi:10.1063/1.4948418

Title: Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA

Journal Article · Wed May 04 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948418· OSTI ID:1255555

Igumenshchev, I. V. ^[1]; Goncharov, V. N. ^[1]; Marshall, F. J. ^[1]; Knauer, J. P. ^[1]; Campbell, E. M. ^[1]; Forrest, C. J. ^[1]; Froula, D. H. ^[1]; Glebov, V. Yu. ^[1]; McCrory, R. L. ^[1]; Regan, S. P. ^[1]; Sangster, T. C. ^[1]; Skupsky, S. ^[1]; Stoeckl, C. ^[1]

Univ. of Rochester, Rochester, NY (United States)

The effects of large-scale (with Legendre modes ≲10) laser-imposed nonuniformities in direct-drive cryogenic implosions on the OMEGA laser system are investigated using three-dimension hydrodynamic simulations performed using a newly developed code ASTER. Sources of these nonuniformities include an illumination pattern produced by 60 OMEGA laser beams, capsule offsets (~10 to 20 μm), and imperfect pointing, energy balance, and timing of the beams (with typical σ_rms ~10 μm, 10%, and 5 ps, respectively). Two implosion designs using 26-kJ triple-picket laser pulses were studied: a nominal design, in which a 880-μm-diameter capsule is illuminated by the same-diameter beams, and a “R75” design using a capsule of 900 μm in diameter and beams of 75% of this diameter. Simulations found that nonuniformities because of capsule offsets and beam imbalance have the largest effect on implosion performance. These nonuniformities lead to significant distortions of implosion cores resulting in an incomplete stagnation. The shape of distorted cores is well represented by neutron images, but loosely in x-rays. Simulated neutron spectra from perturbed implosions show large directional variations and up to ~ 2 keV variation of the hot spot temperature inferred from these spectra. The R75 design is more hydrodynamically efficient because of mitigation of crossed-beam energy transfer, but also suffers more from the nonuniformities. Furthermore, simulations predict a performance advantage of this design over the nominal design when the target offset and beam imbalance σ_rms are reduced to less than 5 μm and 5%, respectively.

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Research Organization:: Univ. of Rochester, NY (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0001944

OSTI ID:: 1255555

Journal Information:: Physics of Plasmas, Vol. 23, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 66 works

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