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The Far-infrared Tangential Interferometer/Polarimeter (FIReTIP) system has been refurbished and
is being reinstalled on the National Spherical Torus Experiment-Upgrade (NSTX-U) to supply
real-time line-integrated core electron density measurements for use in the NSTX-U plasma control
system (PCS) to facilitate real-time density feedback control of the NSTX-U plasma. Inclusion
of a visible light heterodyne interferometer in the FIReTIP system allows for real-time vibration
compensation due to movement of an internally mounted retroreflector and the FIReTIP front-end
optics. Real-time signal correction is achieved through use of a National Instruments CompactRIO
field-programmable gate array.
