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

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 × 10 17 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.
Authors:
 [1] ; ORCiD logo [1]
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Report Number(s):
2017-85, 2385
Journal ID: ISSN 1070-664X; 2017-85, 1428, 2385
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CBET; ICF; NIF; LPI; PDD; wavelength detuning
OSTI Identifier:
1467080
Alternate Identifier(s):
OSTI ID: 1461566

Collins, T. J. B., and Marozas, J. A.. Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility. United States: N. p., Web. doi:10.1063/1.5039513.
Collins, T. J. B., & Marozas, J. A.. Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility. United States. doi:10.1063/1.5039513.
Collins, T. J. B., and Marozas, J. A.. 2018. "Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility". United States. doi:10.1063/1.5039513.
@article{osti_1467080,
title = {Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility},
author = {Collins, T. J. B. and Marozas, J. A.},
abstractNote = {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.},
doi = {10.1063/1.5039513},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}