From Event: SPIE Optical Engineering + Applications, 2016
The National Ignition Facility (NIF) is a 192 laser beam facility designed to support the Inertial Confinement Fusion program based on laser-target interactions. The Optical Thomson Scattering (OTS) diagnostic 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. A deep-UV probe beam is needed to overcome the large background of self-Thomson scattering produced by the 351nm (3ω) NIF drive beams. A two-phase approach to OTS on NIF will mitigate the risk presented by background levels. In Phase I, the diagnostic will assess background levels around a potential deep-UV probe wavelength considered for 5ω Thomson scattering measurements to be conducted in Phase II. The Phase I design of the diagnostic includes an unobscured collection telescope, dual crossed Czerny-Turner spectrometers, and the shared use of one streak camera located inside of an airbox. The Phase II design will include a 5ω probe laser. We will describe the engineering design and concept of operations of the Phase I NIF OTS diagnostic, with a focus on optomechanical disciplines.
Justin Galbraith, Phil Datte, Steven Ross, George Swadling, Stacie Manuel, Bill Molander, Ben Hatch, Dan Manha, Mike Vitalich, and Brad Petre, "Design of an Optical Thomson Scattering diagnostic at the National Ignition Facility," Proc. SPIE 9966, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion V, 99660E (Presented at SPIE Optical Engineering + Applications: September 01, 2016; Published: 19 September 2016); https://doi.org/10.1117/12.2237906.
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