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A Gytrotron FU CW III using a 20 T superconducting magnet has been developed as a radiation source in the THz region. At the first experiment, several radiation by fundamental operation were observed and measured frequencies.
Two sealed-off gyrotron tubes for high power THz spectroscopy are designed and constructed. One of them will be used for ESR echo experiment in sub-THz region, and another for 600 MHz DNP-NMR experiment etc. Both gyrotrons are named Gyrotron FU CW IIA and Gyrotron FU CW VIIA, because their cavities have same shapes as Gyrotrons FU CW II and FU CW VII. Both tubes are installed in 8T superconducting...
The effective characteristics of high frequency and strong electric field processing were observed. One of the interesting effects is so called non-thermal effect or microwave effect. In order to widely study the non-thermal effect of ceramics sintering and application of material heating, we developed a material processing system by using a 300 GHz gyrotron. This system are consisted of a 300 GHz,...
The latest gyrotron included Gyrotron FU CW Series, Gyrotron FU CW III is introduced in detail. It consists of a 20T superconducting magnet, a demountable gyrotron tube, a 30 kV, 0.5 A, CW power supply for electron gun and additional coils in a gun region. The gyrotron has achieved the breakthrough of 1 THz and frequency step tunability up to around 540 GHz for fundamental operations and up to 1.08...
The effective characteristics of high frequency and strong electric field processing were observed. One of the interesting effects is so called non-thermal effect or microwave effect. In order to widely study the non-thermal effect of ceramics sintering, we developed a material processing system by using a 300 GHz gyrotron. Successful submillimeter wave sintering of partially stabilized zirconia ceramics...
The gyrotron consists of a 20 T superconducting magnet, a demountable gyrotron tube, a triode-type magnetron injection gun, and a sapphire output window. Additional coils are installed surrounding the electron gun centered at the emitter to adjust the beam radius and beam quality at the cavity region. The operation conditions of the cavity modes at second harmonic were investigated through the numerical...
The effect characteristic of high frequency and strong electric field processing was observed. One of interest effects is so called non-thermal effect or microwave effect. In order to widely study the non-thermal effect of ceramics sintering. We developed a material processing system by using a 300 GHz gyrotron. This system consists of a 300 GHz, 3.5 kW, CW gyrotron (gyrotron FU CW I) with a cryogen-free...
For application of high frequency gyrotrons to high power THz technologies, we are developing THz CW gyrotron, FU CW Series. Gyrotron FU CW I with 12 T liquid He free superconducting magnert has already been developed applied for material processing, for example, ceramics sintering. The second gyrotron of the series, Gyrotron FU CW II with an 8 T superconducting magnet has been constructed and the...
Simulation results of a CW 1 THz gyrotron operates at second harmonic are described. Gyrotron utilize a newly obtained 20 T superconducting magnet. Mode competition analysis is employed to investigate operation conditions for excitation of the second harmonic cavity modes in a single mode operation. Simulation results shows frequency tunability of 22.9 percent with frequency ranging from 781.6 to...
We developed the material heating system by using a 300 GHz gyrotron. This system are consisted of a 300 GHz, 3.5 kW, CW gyrotron with a cryogen free 12 T superconducting magnet (Gyrotron FU CW I), a corrugated circular waveguide and an applicator. The circular corrugated waveguide ( i.d. = 6.35 cm) with a corrugated period and depth of 254mum have been designed. The applicator has been designed for...
A gyrotron with a 21 T pulse magnet achieved the breakthrough of 1 THz. This is the first result of high frequency operation in the world beyond 1 THz. In addition, new gyrotron series in FIR FU, University of Fukui, so-called gyrotron FU CW series is being developed. Such a present status of high frequency gyrotron in FIR FU will be introduced.
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