Diagnostic Ungrades for NSTX-U*

UC Davis is currently funded to develop three plasma diagnostics for NSTX-U. An 8-channel 693 GHz poloidal high-k scattering system to study high-k electron density fluctuations on NSTX-U. The probe beam is launched from Bay G towards Bay L where optics collect radiation at 8 simultaneous scattering angles ranging from 2 to 15°. This yields measurement of poloidal wavenumbers from 7 cm-1 to >40 cm-1, while translatable optics allow placement of the scattering volume from r/a = 0.1 out to the pedestal region. The second is the Far-Infrared Tangential Interferometer/ Polarimeter (FIReTIP) system, which will provide real-time density feedback control for the Real-Time Control and Protection (RTCP) system. The third is a 5×4 channel (5 poloidal, 4 radial) microwave imaging reflectometer (MIR) system employing system-on-chip (SoC) transmitter and receivers and sharing the same Bay L port as high-k scattering. Details of the diagnostics, including installation and commissioning schedules, will be presented.