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Title: Far-infrared tangential interferometer/polarimeter design and installation for NSTX-U
Contributors: Scott, E.R.
Barchfeld, R.
Riemenschneider, P.
Domier, C.W.
Muscatello, C.M.
Sohrabi, M.
Kaita, R.
Ren, Y.
Luhmann Jr., N.C.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: NSTX-U
Issue Date: Nov-2016
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Review of Scientific Instruments, Vol. 87, p. 11E114 (November 2016)
Abstract: 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.
Appears in Collections:NSTX-U

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