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We have developed a millimeter wave pulsed electron spin resonance (ESR) spectrometer by using a high power radiation source gyrotron. As the high power millimeter wave source, a CW operated sub-THz Gyrotron is constructed. Operating tests of Gyrotron has already carried out successfully.
A sub-THz wave magnetic resonance force microscope (MRFM) has been developed with a CW gyrotron (TE22,8 mode, f~299.23 GHz) at University of Fukui. We have successfully measured the MRFM signal at B>10 T, from the free radical spins in a bis-diphenylene-phenyl-allyl (BDPA) crystal sample attached on a cantilever. Sub-THz wave MRFM will be a key technology to achieve the atomic-scale spatial resolution...
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...
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.
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...
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