The DIII-D tokamak (https://fusion.gat.com/global/diii-d/home) is an experimental fusion research facility in La Jolla, California. Scientists there are conducting cutting edge research into divertor physics, suppression of plasma instabilities with 3D magnetic field perturbation, and many other areas. UW-Madison students and researchers in the 3DPSI group are collaborating with scientists at DIII-D in this exciting research.

 The 3D-PSI Group manages several diagnostics at DIII-D. These include two Penning gauges in the upper and lower pumping plena, with capability of measuring neutral pressures of deuterium, helium, neon and other impurity neutral species. Also included in our contributions to the program is installation of the WISP (Wisconsin In-Situ Penning) gauge, which was designed by the 3DPSI group and has the capability to measure impurity neutral species. It is deployed in the Small Angle Slot (SAS) divertor. Finally, a helium beam edge electron density and temperature diagnostic has also recently been constructed at DIII-D, part of the helicon wave antenna project at DIII-D. This diagnostic will diagnose the plasma edge region in tokamak plasmas heated with the new helicon wave antenna.