Irvine FRC Equilibria Measurements

We plan on launching lower hybrid waves into our axially-symmetric \textbf{F}ield \textbf{R}eversed \textbf{C}onfiguration. Lower hybrid wave propagation depends strongly on both the magnetic and density profiles. We therefore must have good maps of our magnetic field and densities as a function of radius and axial position. The field and density mapping is done using two 3-D magnetic probe arrays, two axial magnetic probe arrays, a 140 GHz interferometer, and a triple probe. Each 3-D array consists of 30 flux loops at 10 different radial positions. We have made magnetic field measurements at different axial positions, giving us all three field components as a function of radius and axial distance. Our two fixed axial arrays measure the axial field at two different radial positions. They provide a reference for comparisons between different shots when the radial array moves. Reversed fields of $\sim $100 Gauss have been observed. The 140 GHz interferometer and triple probe combination has given us line densities of high 10$^{14 }$cm$^{-2}$ with peak densities of 2x10$^{13}$ cm$^{-3}$.