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

Journal Article · · Physics of Plasmas
DOI: https://doi.org/10.1063/1.5039513 · OSTI ID:1467080
 [1]; ORCiD logo [2]
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
  2. 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.

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 journal December 2018
X-ray spectroscopy of planar laser-plasma interaction experiments at the National Ignition Facility journal January 2019