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We demonstrate a novel detection method for the cyclotron resonance frequencyof an electron plasma in a Penning-Malmberg trap. With this technique, theelectron plasma is used as an in situ diagnostic tool for measurement of thestatic magnetic field and the microwave electric field in the trap. Thecyclotron motion of the electron plasma is excited by microwave radiation andthe temperature change of the plasma is measured non-destructively bymonitoring the plasma's quadrupole mode frequency. The spatially-resolvedmicrowave electric field strength can be inferred from the plasma temperaturechange and the magnetic field is found through the cyclotron resonancefrequency. These measurements were used extensively in the recently reporteddemonstration of resonant quantum interactions with antihydrogen.

In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap