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.
[1]- 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}
}