Datte P S, Ross J S, Froula D H, Daub K D, Galbraith J, Glenzer S, Hatch B, Katz J, Kilkenny J, Landen O, Manha D, Manuel A M, Molander W, Montgomery D, Moody J, Swadling G F, Weaver J
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
Rev Sci Instrum. 2016 Nov;87(11):11E549. doi: 10.1063/1.4962043.
The National Ignition Facility (NIF) is a 192 laser beam facility designed to support the Stockpile Stewardship, High Energy Density and Inertial Confinement Fusion (ICF) programs. We report on the design of an Optical Thomson Scattering (OTS) diagnostic that has the potential to transform the community's understanding of NIF hohlraum physics by providing first principle, local, time-resolved measurements of under-dense plasma conditions. The system design allows operation with different probe laser wavelengths by manual selection of the appropriate beam splitter and gratings before the shot. A deep-UV probe beam (λ-210 nm) will be used to optimize the scattered signal for plasma densities of 5 × 10 electrons/cm while a 3ω probe will be used for experiments investigating lower density plasmas of 1 × 10 electrons/cm. We report the phase I design of a two phase design strategy. Phase I includes the OTS telescope, spectrometer, and streak camera; these will be used to assess the background levels at NIF. Phase II will include the design and installation of a probe laser.
国家点火装置（NIF）是一个拥有192束激光束的设施，旨在支持库存管理、高能量密度和惯性约束聚变（ICF）项目。我们报告了一种光学汤姆逊散射（OTS）诊断装置的设计，该装置有可能通过提供对欠稠密等离子体条件的第一性原理、局部、时间分辨测量，改变学界对NIF黑腔物理的理解。该系统设计允许在射击前通过手动选择合适的分束器和光栅，以不同的探测激光波长进行操作。深紫外探测光束（λ = 210 nm）将用于优化5×10电子/立方厘米等离子体密度下的散射信号，而三倍频探测光束将用于研究1×10电子/立方厘米较低密度等离子体的实验。我们报告了一个两阶段设计策略的第一阶段设计。第一阶段包括OTS望远镜、光谱仪和条纹相机；这些将用于评估NIF的背景水平。第二阶段将包括探测激光的设计和安装。
