Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility
Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility
复制标题
DOI：
10.1063/1.5039513
复制
发表时间：
2018-07-01
影响因子：
2.2
通讯作者：
Marozas, J. A.
中科院分区：
文献类型：
--
作者：
Collins, T. J. B.;Marozas, J. A.
两种新的目标设计，使用直接激光烧蚀（直接驱动）在国家点火装置组装和点燃低温燃料使用现有的间接驱动光束配置。这些是第一个点火相关的“极性”直接驱动目标设计，包括激光束和非局部电子热传输之间的交叉束能量转移（CBET）的物理效应。一个波长失谐的策略是用来增加吸收和减少CBET所造成的散射光损失，允许点火相关的内爆速度。描述了两种设计：一种中等中子密度亚点火α燃烧设计，其D-T中子聚变产额为1.2 × 10（17），一种低中子密度点火设计，其增益为27。这两种设计都具有中等的飞行展弦比，表明在内爆过程中流体动力学不稳定性处于可接受的水平。由AIP出版社出版。
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.