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We have built a 2SB mixer, which has demonstrated a sideband rejection ratio as high as 15 dB over the full band of 600–720 GHz and the SSB noise temperature between 200 and 370 K. Both sideband ration and noise temperature are well within the ALMA specifications.
We report a W-band backward-wave oscillator using micro-fabrication technologies by which a fully 3-dimensional slow-wave interaction circuit is successfully employed on multi-bonded silicon wafers. MEMS (micro-electromechanical systems) technologies such as deep RIE (reactive ion etching) and thermocompressive hermetic bonding are applied to achieve highly accurate dimensional structures for high...
We present a systematic analysis of geometry-dependent parasitics for THz sub-harmonic Schottky mixer diodes. In particular, the diode RF power coupling bandwidth has been studied, showing a trade-off between the air-bridge finger length and finger separation for operating frequencies beyond 1 THz.
In this paper, Smith-Purcell effect, which utilizes metallic grating and electron bunches, was investigated for a new device of terahertz (THz)-wave generation. Femtosecond electron bunches induced multimode THz-wave at a frequency of <0.7 THz.
A Mid-infrared Free-Electron Laser (MIR-FEL) facility named as KU-FEL (Kyoto University FEL) has been developed in Institute of Advanced Energy, Kyoto University. The facility aims at utilizing MIR-FEL to various energy related sciences, such as material, biological and chemical sciences. The present status, performance and result of demonstration experiment are reported in this paper.
Start-to-end calculation has been performed to estimate the performance of the THz FEL system using a photocathode RF gun which will be installed to existing MIR-FEL (KU-FEL) system at Institute of Advanced Energy, Kyoto University. The aim of this system is a test bench to realize the table-top THz system. The electron beam properties have been evaluated from the photocathode RF gun to the entrance...
Simulations have been conducted at the University of Strathclyde to study the electrodynamics of the cyclotron maser instability responsible for generating auroral magnetospheric radio emission from stars and planets with a dipole like magnetic field configuration.
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