Simultaneous two-dimensional laser induced fluorescence measurements in a helicon plasma

Recent upgrades to the laser induced fluorescence system at West Virginia University have made possible simultaneous two-dimensional ion velocity distribution function measurements in the Hot hELIcon eXperiment. A single dye laser is split into two beams, each modulated at a different frequency using a mechanical chopper. The two beams are then injected into the plasma chamber with one parallel and one perpendicular to the background magnetic field. Fluorescence signal from each beam is then collected simultaneously at single location using a single set of collection optics. We will present measurements of the thermal anisotropy as a function of the plasma radius obtained with a two-dimensional scanning mount.