An Overview of Laser Diagnostics Developed for the Compact Fusion Reactor

The T4B experiment is a linear, encapsulated ring cusp confinement device, designed to develop a physics and technology basis for a follow-on high beta machine as part of the compact fusion reactor program. Toward this end, a pair of non-invasive laser diagnostics have been developed to investigate confinement, neutral beam heating, and source behavior on the T4B device. These diagnostics include: (1) a Thomson scattering system employing a 532 nm Nd:YAG laser and high throughput spectrometer to measure electron density and temperature and (2) a dispersion interferometer utilizing a continuous-wave CO2 laser (𝝀 = 10.6 μm) to measure time resolved, line-integrated electron density. An overview of laser systems, detection schemes, and data analysis techniques for both systems is presented, including up to date results obtained from the T4B experimental campaign.
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