The preliminary design of the optical Thomson scattering diagnostic for the National Ignition Facility

9th International Conference on Inertial Fusion Sciences and Applications

Datte, P.^1 ; Ross, J.S.^1 ; Froula, D.^2 ; Galbraith, J.^1 ; Glenzer, S.^5 ; Hatch, B.^1 ; Kilkenny, J.^1 ; Landen, O.^1 ; Manuel, A.M.^1 ; Molander, W.^1 ; Montgomery, D.^3 ; Moody, J.^1 ; Swadling, G.^1 ; Weaver, J.^4 ; De Dios, G Vergel^1 ; Vitalich, M.^1

Lawrence Livermore National Laboratory, Livermore

CA, United States^1

Laboratory for Laser Energetics, University of Rochester, Rochester

NY, United States^2

Los Alamos National Laboratory, Los Alamos

NM, United States^3

Plasma Physics Division, Naval Research Laboratory, Washington, DC, United States^4

SLAC National Accelerator Laboratory, Menlo Park

CA, United States^5

关键词: High energy densities;    National ignition facility;    Preliminary design;    Probe laser wavelength;    Thomson scattered light;    Thomson scattering;    Thomson scattering diagnostics;    Time resolved measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012089/pdf
DOI  :  10.1088/1742-6596/717/1/012089

来源: IOP

【 摘 要 】

The National Ignition Facility (NIF) is a 192 laser beam facility designed to support the Stockpile Stewardship, High Energy Density and Inertial Confinement Fusion programs. We report on the preliminary 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 beamsplitter and gratings before the shot. A deep-UV probe beam (λ0between 185-215 nm) will optimally collect Thomson scattered light from plasma densities of 5 x 1020electrons/cm3while a 3ω probe will optimally collect Thomson scattered light from plasma densities of 1 x 1019electrons/cm3. We report the phase I design of a two phase design strategy. Phase I includes the OTS recording system to measure background levels at NIF and phase II will include the integration of a probe laser.