W7-X: WISP gauges (Thierry Kremeyer/Jessica Hoffman)
The WISP gauge project is an ongoing collaboration between UW Madison and the Max-Plank Institute. The Wisconsin In Situ Penning (WISP) gauge has been developed and successfully implemented at the Max-Plank Institute for Plasma Physics in Greifswald, Germany, within the Wendelstein 7-X (W7X) Stellarator.
With the goal of advancing research for efficient, clean fusion energy, W7X is a multinational endeavor and the largest steady-state fusion energy experiment of its kind. The contribution to W7X from the WISP gauge project comes from the capacity to measure impurities within the neutral reservoir space.
A WISP gauge itself is a miniaturized Penning gauge arrangement, which exploits the ambient magnetic field of magnetic confinement fusion experiments to establish the Penning discharge. Through these discharges, impurities can be detected, thus allowing adjustments to avoid radiative energy loss and fuel dilution. The employability of the WISP gauge extends beyond W7X, and is also applicable to other Stellarators, as well as other fusion energy devices, such as Tokamaks.
HeBeam/Spectroscopy (Erik Flom)