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The results of stabilization of both output power and frequency by double PID feedback control of the acceleration and anode voltage in the 460 GHz Gyrotron FU CW GVI (“Gyrotron FU CW GO-1” as an official name in Osaka University) are presented. The experiment based on the cyclotron frequency modulation by modulation of acceleration voltage of beam electrons and on pitch factor modulation by modulation...
The results of both gyrotron output power and frequency stabilization by double PID feedback control of acceleration voltage and anode voltage have been presented. The second harmonic 460 GHz Gyrotron with isolated collector has been used in the stabilization experiment. In the long term experiment, the frequency stabilization was better than 10−6 and the power stabilization was better than ±1%.
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.
Multifilling with La, Ba, Ga, and Ti in p-type skutterudite and Yb, Ca, Al, Ga, and In in n-type skutterudite remarkably reduces their thermal conductivity, resulting in enhancement of their dimensionless figure of merit ZT to ZT = 0.75 for p-type (La,Ba,Ga,Ti)1(Fe,Co)4Sb12 and ZT = 1.0 for n-type (Yb,Ca,Al,Ga,In)0.7(Co,Fe)4Sb12. A thermoelectric module technology suitable for these skutterudites...
A compact GaAs pHEMT monolithic microwave integrated circuit balanced frequency doubler is presented. It is composed of a common-source/common-gate active balun, a balanced frequency doubler, and a band pass filter. Excellent miniaturization is achieved by using double-and triple-layer stacked inductors and a miniaturized stub as a band-pass filter with a thin-film microstrip line. The chip size is...
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