Optimization of laser-driven cylindrical implosions on the OMEGA laser

E. C. Hansen, D. H. Barnak, P. Y. Chang, R. Betti, E. M. Campbell, J. R. Davies, J. P. Knauer, J. L. Peebles, S. P. Regan, A. B. Sefkow

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Laser-driven cylindrical implosions were conducted on the OMEGA laser as part of the laser-driven mini-MagLIF (Magnetized Liner Inertial Fusion) Campaign. Gated x-ray images were analyzed to infer shell trajectories and study the energy coupling in these implosions. Two-dimensional and three-dimensional HYDRA simulations were performed and post-processed to produce synthetic x-ray self-emission images for comparison. An analysis technique, which could be applied to both experimental and simulated x-ray images, was developed to characterize the shape and uniformity of the implosion. The analysis leads to a measurement of the average implosion velocity and axial implosion length, which can then be used to optimize the beam pointing and energy balance for future experiments. Discrepancies between simulation results and experiments allude to important physical processes that are not accounted for in the simulations. In 2-D simulations, the laser beam's azimuthal angle of incidence is not included because the φ-direction is not simulated, and thus, energy absorption is over-predicted. The 3-D simulation results are more consistent with the experiments, but the simulations do not include the calculation of cross-beam energy transfer or non-local thermal transport, which affects the energy coupled to the implosion. By appropriately adjusting the simulated energy balance and flux limit, the simulations can accurately model the experiments, which have achieved uniform implosions over a 700-μm-long region at velocities of approximately 200 km/s.

Original languageEnglish
Article number122701
JournalPhysics of Plasmas
Volume25
Issue number12
DOIs
Publication statusPublished - 2018 Dec 1

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implosions
optimization
lasers
simulation
x rays
energy
energy absorption
linings
incidence
adjusting
energy transfer
trajectories
laser beams

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Hansen, E. C., Barnak, D. H., Chang, P. Y., Betti, R., Campbell, E. M., Davies, J. R., ... Sefkow, A. B. (2018). Optimization of laser-driven cylindrical implosions on the OMEGA laser. Physics of Plasmas, 25(12), [122701]. https://doi.org/10.1063/1.5055776
Hansen, E. C. ; Barnak, D. H. ; Chang, P. Y. ; Betti, R. ; Campbell, E. M. ; Davies, J. R. ; Knauer, J. P. ; Peebles, J. L. ; Regan, S. P. ; Sefkow, A. B. / Optimization of laser-driven cylindrical implosions on the OMEGA laser. In: Physics of Plasmas. 2018 ; Vol. 25, No. 12.
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Hansen, EC, Barnak, DH, Chang, PY, Betti, R, Campbell, EM, Davies, JR, Knauer, JP, Peebles, JL, Regan, SP & Sefkow, AB 2018, 'Optimization of laser-driven cylindrical implosions on the OMEGA laser', Physics of Plasmas, vol. 25, no. 12, 122701. https://doi.org/10.1063/1.5055776

Optimization of laser-driven cylindrical implosions on the OMEGA laser. / Hansen, E. C.; Barnak, D. H.; Chang, P. Y.; Betti, R.; Campbell, E. M.; Davies, J. R.; Knauer, J. P.; Peebles, J. L.; Regan, S. P.; Sefkow, A. B.

In: Physics of Plasmas, Vol. 25, No. 12, 122701, 01.12.2018.

Research output: Contribution to journalArticle

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N2 - Laser-driven cylindrical implosions were conducted on the OMEGA laser as part of the laser-driven mini-MagLIF (Magnetized Liner Inertial Fusion) Campaign. Gated x-ray images were analyzed to infer shell trajectories and study the energy coupling in these implosions. Two-dimensional and three-dimensional HYDRA simulations were performed and post-processed to produce synthetic x-ray self-emission images for comparison. An analysis technique, which could be applied to both experimental and simulated x-ray images, was developed to characterize the shape and uniformity of the implosion. The analysis leads to a measurement of the average implosion velocity and axial implosion length, which can then be used to optimize the beam pointing and energy balance for future experiments. Discrepancies between simulation results and experiments allude to important physical processes that are not accounted for in the simulations. In 2-D simulations, the laser beam's azimuthal angle of incidence is not included because the φ-direction is not simulated, and thus, energy absorption is over-predicted. The 3-D simulation results are more consistent with the experiments, but the simulations do not include the calculation of cross-beam energy transfer or non-local thermal transport, which affects the energy coupled to the implosion. By appropriately adjusting the simulated energy balance and flux limit, the simulations can accurately model the experiments, which have achieved uniform implosions over a 700-μm-long region at velocities of approximately 200 km/s.

AB - Laser-driven cylindrical implosions were conducted on the OMEGA laser as part of the laser-driven mini-MagLIF (Magnetized Liner Inertial Fusion) Campaign. Gated x-ray images were analyzed to infer shell trajectories and study the energy coupling in these implosions. Two-dimensional and three-dimensional HYDRA simulations were performed and post-processed to produce synthetic x-ray self-emission images for comparison. An analysis technique, which could be applied to both experimental and simulated x-ray images, was developed to characterize the shape and uniformity of the implosion. The analysis leads to a measurement of the average implosion velocity and axial implosion length, which can then be used to optimize the beam pointing and energy balance for future experiments. Discrepancies between simulation results and experiments allude to important physical processes that are not accounted for in the simulations. In 2-D simulations, the laser beam's azimuthal angle of incidence is not included because the φ-direction is not simulated, and thus, energy absorption is over-predicted. The 3-D simulation results are more consistent with the experiments, but the simulations do not include the calculation of cross-beam energy transfer or non-local thermal transport, which affects the energy coupled to the implosion. By appropriately adjusting the simulated energy balance and flux limit, the simulations can accurately model the experiments, which have achieved uniform implosions over a 700-μm-long region at velocities of approximately 200 km/s.

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Hansen EC, Barnak DH, Chang PY, Betti R, Campbell EM, Davies JR et al. Optimization of laser-driven cylindrical implosions on the OMEGA laser. Physics of Plasmas. 2018 Dec 1;25(12). 122701. https://doi.org/10.1063/1.5055776