Control and Manipulation of Microwave Polarization and Power of a Frequency-Agile 198 GHz Gyrotron for Magnetic Resonance

Abstract The measurement and manipulation of the microwave polarization emitted from a frequency-agile 198 GHz gyrotron for dynamic nuclear (DNP) are demonstrated. In general, gyrotrons emit linearly polarized radiation, yet in this case elliptical is observed window. Indeed, half power circularly while other with 60 ∘ respect to horizontal plane. For optimal use DNP experiments, converted into circular Martin-Puplett interferometer (MPI). dependence enhancement on was investigated by modifying MPI. addition, MPI can generate beam, which holds promise future development induction-mode electron spin detected experiments.