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Designs and implementation of a novel tunable 250 GHz gyrotron oscillator for Dynamic Nuclear Polarization (DNP) experiments with >10 W output power over most of a 3 GHz band and >35 W peak power are shown. The bandwidth and power can generate a substantial THz field over the band used for DNP experiments, without the need for sweeping the NMR magnetic field. Substantially improved tunability...
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