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In any TWT design, understanding of potential spurious oscillation characteristics is critical to achieve optimal amplifier performance and, more importantly, to avoid the unpleasant surprise of discovering problems after the fact. This paper serves to illustrate these oscillation characteristics and to discuss potential mitigation approaches with special emphasis on serpentine/folded-waveguide TWTs...
We discuss the design and implementation of a waveguide coupler for a sheet-beam coupled-cavity structure. Discussion includes excitation of the fundamental mode with low VSWR, wide bandwidth, circuit sensitivity, and tuning. We conclude with a comparison with round-beam structure, and experimental results of sheet beam coupler.
Summary form only given. Biological applications of pulsed electric fields (PEF) have been discussed in the last decade. Schoenbach et al have investigated the biological activity of various kinds of cells subjected to nanosecond pulsed electric fields (nsPEF). They reported nsPEF induces the increase in intracellular Ca2+, DNA fragmentation, activation and inactivation of proteins related to apoptosis...
Summary form only given. There are a number of studies that show the biological effects of intense pulsed electric fields (PEFs) dependent on the waveform of the pulses such as duration, rise time as well as the number of pulses. PEFs with a pulse duration exceeding 1 us cause the increase in the permeability of cell membrane in other words electroporation. As the duration and rise time of PEF are...
We describe a novel slow-wave structure formed by a periodic array of rectangular rings interconnected by diagonal conductors. The sheet beam topology has the potential to significantly increase the output power of traveling-wave amplifiers at millimeter-wave frequencies and the small circuit period enables operation at relatively low voltages, far from the conditions for backward-wave oscillation...
The dissipation current waveform monitoring method is considered one of possible way as a diagnostic method for un-bridged water tree on the high-voltage class (22-77 kV) power cable. In previous CEIDP, it has reported that the amplitude and the phase of the fundamental and the 3rd harmonic components have varied with the progress of the un-bridged water tree deterioration and the phase of the 3rd...
The dissipation current waveform observation method is considered one of possible way as a diagnostic method for the un-bridged water tree on the high-voltage class power cable. In this paper, in order to clarify the time variations with the un-bridged water tree growth, by using the special chamber and setup, the dissipation current waveforms monitoring under the high voltage application test of...
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