Annelle Eben is the first researcher to use the brand new Hitachi TM 3000 scanning electron microscope (SEM). She is examining high temperature superconducting circuits and building a catalog of samples for the Microwave Laboratory and its collaborators.
A SCIENTIFIC FIRST!!!
Evan Pease is measuring the even and odd order distortion signals from a superconducting microwave filter. He is using three input signals with a method being developed exclusively in the Hope College Microwave Lab called 3-tone intermodulation
distortion. This ground breaking research will help to establish the limits of superconductivity in microwave electronics and at the same time reveal new insights into the physics of high temperature superconducting materials. The graph to the right (click on it) shows the 3rd order nonlinearity, revealing a “nonlinearity catastrophe” at the superconducting transition temperature. Evan is measuring signals as small as 30 femtoWatts in this experiment.
Cameron Recknagel and Evan Pease are assembling a vacuum chamber for an experiment in plasma generation in the microwave lab. The gas in the chamber is subjected to a high microwave field which causes an avalanche of ionization events. Cameron will analyze the optical emission spectra to understand the role of collision frequency on the electronic transitions in the plasma.