Development of Gyrotron FU CW IIA for 600 MHz and 300 MHz DNP-NMR experiments at the University of Warwick

On the basis of successful development of Gyrotron FU CW II, a similar gyrotron FU CW IIA is being developed for both 600 MHz and 300 MHz DNP-NMR experiments at the University of Warwick in UK. The frequencies of the gyrotron are 394.6 GHz at the second harmonic and 200 GHz at fundamental that correspond to frequencies 600 MHz and 200 GHz DNP-NMR spectroscopy. The output powers are around 30 W and 200 W, respectively. Both operations are in CW modes.