Diagnostic Development for the Lockheed Martin Compact Fusion Reactor Project

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. Three non-invasive laser diagnostics have been developed to investigate confinement, neutral beam heating, and source behavior on the T4B device, including (1) a Thomson scattering system employing a 532 nm Nd:YAG laser to measure electron density and temperature, (2) a dispersion interferometer utilizing a continuous-wave CO2 laser (10.6 $\mu $m) to measure time resolved, line-integrated electron density and (3) a dispersion interferometer utilizing a continuous-wave, 532 nm Nd:YAG laser to measure time resolved, line-integrated electron density. An overview of laser systems, detection schemes, and data analysis techniques is presented, including up to date results obtained from the T4B experimental campaign. We also present a suite of non-invasive diagnostics for the T4B experiment looking at several aspects of the plasma performance including plasma emissions (bolometry, spectroscopy), stability, and magnetic field perturbations. \copyright 2019 Lockheed Martin Corporation. All Rights Reserved.