Millimeter wave measurements of the TFTR line integrated density & electron temperature profile

Millimeter — submillimeter wave diagnostics are expected to contribute to the characterization of the Tokamak Fusion Test Reactor (TFTR) plasma. The goal of TFTR is to demonstrate energy breakeven by generating fusion neutron power equal to the input power to the plasma. Plasma breakeven conditions includeg electron and ion temperatures on the order of 10⁸ °K and plasma densities of n ∼ 10¹⁴ particles/cm³. Four millimeter-submillimeter instruments will diagnose the TFTR plasma: (1) 1mm wave density interferometer, (2) Fast Scanning heterodyne radiometer, (3) Fourier Transform Spectrometer, and (4) 1mm wave density scattering. With the exception of the scattering system, the design of these diagnostics were presented at the Sixth International Conference on Infrared and Millimeter Waves.¹ This past year the 1mm interferometer and the fast scanning heterodyne receiver have measured the line average density and the time evolution of the electron temperature profile of the TFTR plasma during its initial operation. The performance of these diagnostics will be presented including examples of plasma density and temperature measurements.