Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility

Collins, T. J. B.; Marozas, J. A.

doi:10.1063/1.5039513

Title: Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility

Journal Article · 23 July 2018 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5039513 · OSTI ID:1467080

Collins, T. J. B. ^[1];

^[2]

Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics

Two novel target designs are presented for using direct laser ablation (direct drive) at the National Ignition Facility to assemble and ignite cryogenic fuel using the existing indirect-drive beam configuration. These are the first ignition-relevant “polar” direct-drive target designs to include the physical effects of cross-beam energy transfer (CBET) between laser beams and nonlocal electron heat transport. A wavelength-detuning strategy is used to increase absorption and reduce scattered-light losses caused by CBET, allowing for ignition-relevant implosion velocities. Two designs are described: a moderate-adiabat sub-ignition alpha-burning design with a D–T neutron fusion yield of 1.2 × 10¹⁷ and a lower-adiabat ignition design with a gain of 27. Lastly, both designs have moderate in-flight aspect ratios, indicating acceptable levels of hydrodynamic instability during the implosion.

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Research Organization:: Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001944

OSTI ID:: 1467080

Alternate ID(s):: OSTI ID: 1461566

Report Number(s):: 2017-85, 2385; 2017-85, 1428, 2385

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited By (2)

The National Direct-Drive Inertial Confinement Fusion Program Regan, S. P.; Goncharov, V. N.; Sangster, T. C. Nuclear Fusion, Vol. 59, Issue 3 https://doi.org/10.1088/1741-4326/aae9b5	journal	December 2018
X-ray spectroscopy of planar laser-plasma interaction experiments at the National Ignition Facility Rosenberg, M. J.; Epstein, R.; Solodov, A. A. Physics of Plasmas, Vol. 26, Issue 1 https://doi.org/10.1063/1.5074191	journal	January 2019

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Title: Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility

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