Powerful sources of coherent radiation in the sub-terahertz and in the terahertz frequency
range of the electromagnetic spectrum are necessary for a great and continuously …

Recent research and development has been incredibly successful at advancing the
capabilities for vacuum electronic device (VED) sources of powerful terahertz (THz) and …

Dynamic nuclear polarization (DNP) increases the sensitivity of nuclear magnetic resonance
(NMR) spectroscopy by using high frequency microwaves to transfer the polarization of the …

A method of increasing the selectivity of highly-oversized open cavities is experimentally
demonstrated in the electron cyclotron maser (gyrotron) operating at the second cyclotron …

We report the experimental demonstration of a gyrotron traveling-wave-tube amplifier at 250
GHz that uses a photonic band gap (PBG) interaction circuit. The gyrotron amplifier achieved …

Till 2005, Research Center for Development of Far-Infrared Region, University of Fukui
(herein referred to as FIR-UF) had developed gyrotrons to aim at increasing their frequency …

New power records of second harmonic gyrotron oscillation have been demonstrated in the
sub-THz band. The first step gyrotron of demountable type had succeeded in oscillation with …

A method of improving the selectivity of open cavities of electron cyclotron masers
(gyrotrons) operating at high cyclotron harmonics in the terahertz frequency range is …

To increase the output power of terahertz gyrotrons to several hundred kilowatts, we suggest
using a planar geometry of interaction space with a sheet electron beam and transverse …

Although numerous studies have proven the effectiveness of self-healing technologies in
concrete, its practical application is limited to only few trials. One of the reasons lies in the …