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.

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