Implementation of a far-infrared interferometer on the Madison symmetric torus

This paper reports on a collaboration between IPFR at UCLA and the University of Wisconsin at Madison which has begun in order to study the physics of the Reversed Field Pinch and Tokamak magnetic confinement configurations. The proposed collaboration initially involves the design, fabrication and installation of a Far-Infrared (FIR) Interferometer System on the Madison Symmetric Torus (MST). This beginning stage will be used to accurately determine the density profile of MST. The system will be capable of low cost upgrades which will allow the measurement of internal magnetic fields via Faraday rotation and density fluctuation spectra via collective scattering. A Reversed Field Pinch device does not allow the typical slot-like ports used in FIR scattering and interferometry as tokamak plasmas. The ports available on MST are small < 4 cm diameter and are not all radially aligned. In order to provide enough spatial resolution, the ports are staggered toroidally, separated by 4 degrees. The optical system must take into account this arrangement