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We present results of theoretical study of influence of the electron velocity spread and the radial width on the efficiency and mode competition in a 300-GHz gyrotron operating in the TE22,2,1 mode, with which 300-kW level high power single mode oscillation has been demonstrated. Effects of a finite voltage rise time corresponding to the real power supply of this gyrotron is also considered. Simulations...
A Broadband frequency tunable gyrotron operating at fundamental resonance for 600 MHz DNP-NMR has been developed. A cavity resonator and a magnetron injection gun are newly designed. In the preliminary experiments, the continuously frequency tuning bandwidth was 1.3 GHz and the output power was increased up to 100 W.
A self-consistent code is introduced to develop a continuous frequency tunable gyro-BWO. A cavity is designed with TE8,5 mode for 400 GHz band second harmonic oscillation. The experimental verification has been carried out and 2 GHz tunability is observed with output powers of higher than 40 W.
CoNiCr/Cr films were sputtered onto polished glass at temperatures Ts ranging from 25 to 400??C, and their magnetic properties were investigated in connection with their micro-structure. Hc was found to increase with increasing Ts while sputtering GoNiCr/Cr films, which consisted mainly of an h.e.p. phase. Analytical transmission electron microscopy revealed that the underlayer Cr diffused into grain...
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