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Microwave irradiation into the stator housing (a) for an ideal Gaussian beam emitted from the end of an 8 mm corrugated waveguide and radiated to a distance of 12 mm from the waveguide end, corresponding to the location of the sample, compared to (b) the measured output. (c) A cross section of the stator and DNP MAS probe showing the coil, sample, waveguide, and drive-cup and bearings of the spinning assembly.
