Direct Real-Time Power Measurement of a High-Power Electron Cyclotron Maser by a Simple One-Point Schottky Detector Signal

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IEEE Transactions on Terahertz Science and Technology, ISSN: 2156-342X, Vol: 5, Issue: 5, Page: 779-785

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Kim, Sung Gug; Kim, Jung Ho; Kim, Dongsung; Won, Jong-Hyo; Lee, Woo Sang; Yang, Jongwon; Choi, EunMi
Institute of Electrical and Electronics Engineers (IEEE); Institute of Electrical and Electronics Engineers
Physics and Astronomy; Engineering; Gaussian beam; gyrotron; calorimeter; power measurement; antenna gain
article description
Measurements of the absolute power of high-power millimeter/THz wave generators have been considered to be highly variable and to occasionally produce faulty results owing to experimental difficulty. In this study, we propose a calibration-free method for real-time power measurement of an electron cyclotron maser system, a so-called gyrotron. We demonstrate the feasibility of the method by using a recently developed W-band gyrotron with a peak power of tens of kilowatts. The technique is based on transmitter antenna power measurement by using the Friis transmission equation with a defined gyrotron antenna gain. The new technique will allow extremely simple and accurate real-time measurement of output power over a wide dynamic range (> 50 dB) for continuous wave sources to high-power millimeter/THz wave sources with nanosecond pulse lengths.