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

被引：14
|
作者：
Collins, T. J. B. [1 ]
Marozas, J. A. [1 ]
机构：
[1] Univ Rochester, Lab Laser Energet, 250 East River Rd, Rochester, NY 14623 USA
来源：
PHYSICS OF PLASMAS | 2018年 / 25卷 / 07期
关键词：
INERTIAL-CONFINEMENT FUSION; SIMULATIONS; OMEGA;
D O I：
10.1063/1.5039513
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
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 x 10(17) and a lower-adiabat ignition design with a gain of 27. Both designs have moderate in-flight aspect ratios, indicating acceptable levels of hydrodynamic instability during the implosion. Published by AIP Publishing.
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页数：9
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