Abstract
In this paper, we propose a high-order mode sheet beam extended interaction klystron (EIK) operating at G-band. Through the study of electric field distribution, we choose TM31 2π mode as the operating mode. The eigenmode simulation shows that the resonant frequency of the modes adjacent to the operating mode is far away from the central frequency, so there is almost no mode competition in our high mode EIK. In addition, by studying the sensitivity of the related geometry parameters, we conclude that the height of the coupling cavity has a great influence on the effective characteristic impedance, and the width of the gap mainly affects the working frequency. Therefore, it is necessary to strictly control the fabrication tolerance within 2 μm. Finally, the RF circuit using six barbell multi-gap cavities is determined, with five gaps for the input cavity and idler cavities and seven gaps for the output cavity. To expand the bandwidth, the stagger tuning method is adopted. Under the conditions of a voltage of 16.5 kV, current of 0.5 A and input power of 0.2 W, the peak output power of 650 W and a 3-dB bandwidth of 700 MHz are achieved without any self-oscillation.
Highlights
Terahertz technology has become one of the most popular technologies, and it has important applications in high-resolution imaging, medical detection, channel communication, material structure analysis and so on [1]
This research and development has been restricted by terahertz radiation sources, which can produce high power, high bandwidth and high efficiency and are easy to use
An extended interaction klystron (EIK) is a potential terahertz source which was proposed by Chodorow and Wessel-Berg in the 1960s [2,3]
Summary
Terahertz technology has become one of the most popular technologies, and it has important applications in high-resolution imaging, medical detection, channel communication, material structure analysis and so on [1]. The G-band sheet beam EIK designed by NRL has 453 W of output power under the conditions of a voltage of 16.5 kV and a current of 0.52 A [11]. The Ka-band EIK has been developed by the Institute of Electronics at the Chinese Academy of Sciences, with an average output power of 355 W and 3-dB bandwidth of 410 MHz under an operating voltage of 9 kV and current of 0.15 A [14]. We aim to design a high-order mode structure with an output power of 500 W and 3-dB bandwidth of 600 MHz with the sheet beam EIK operating in TM31 mode. Under the condition of an input power of 0.2 W, voltage of 16.5 kV, current of 0.5 A and magnetic field of 0.5 T, 650 W of output power and 700 MHz at a 3-dB bandwidth are obtained, which are the milestones for the generation of high-output power in the G-band
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