Plasma Potential Measurements Using an Emissive Probe in Diverse Plasmas.

Making accurate plasma potential (V p) measurements is critical to the Wisconsin Plasma Physics Laboratory (WiPPL), which conducts a variety of plasma experiments. We present a simple yet robust emissive probe capable of making V p measurements in a diverse number of environments. This probe was tested with varying levels of Joule heating current, verifying that the probe makes accurate V p measurements. We will present the design of the probe, data verifying its emissive nature, measurements showing the probe collecting current from the plasma to bring it to the emissive point, and a cusp region scan of WiPPL's Plasma Couette Experiment (PCX)..