Remote Control Operation of High-k Scattering and FIReTIP on NSTX-U

Two laser-based plasma diagnostic systems, the high-k poloidal scattering system [1] and the Far Infrared Tangential Interferometer/Polarimeter (FIReTIP) system [2], are under development for NSTX-U. The high-k system will collect density fluctuation data at 8 simultaneous scattering angles corresponding to poloidal wavenumbers from 7 cm^-1 to >30 cm^-1, while FIReTIP will provide time-resolved, chord-integrated electron density and tangential B-field data. Both diagnostics use CO₂ and optically pumped FIR lasers to generate THz source beams, and are to be remotely controlled from the NSTX-U control room using a dedicated LabVIEW program. Key features include: (1) Real-time monitoring of the CO₂/FIR laser status, (2) remote cavity control of each laser to enhance both power and frequency stability, and (3) remote control the high-k scattering launch mirror and 4-axis receiver optics to optimize the placement of the high-k interaction region to maximize physics output. Details of each diagnostic will be presented, detailing both the hardware and software elements of the remote controls.