Experimental study of a fourth-harmonic gyromultiplier

Abstract

Simultaneous generation at the second and fourth cyclotron harmonics has been obtained from a single-cavity self-excited gyromultiplier. Output power of the short-wavelength radiation amounts to 100 W at a frequency of 75 GHz. The proposed scheme seems to be promising for the terahertz frequency range.

A Dual-Frequency Quasi-Optical Output System for a THz Gyro-Multiplier

“…It should be noticed that the similar propagation properties of the two modes are essential to the optimal performance of the designed DQMC. As seen from the mode selection criteria and the operation principle of the gyro-multiplier [4], [5], the k 0 , k z , k ⊥ , m, μ m, n , and ω of the T E 4, 9 mode are (nearly or exactly) four times in value of their counterparts in T E 1, 3 mode. This…”

“…A GYRO-MULTIPLIER is a high-power THz signal generator based on the combination of traditional gyrotron-like beam-wave interaction [1] and frequency multiplication [2]. Although the operation of the gyro-multiplier has been studied extensively in theory [3], [4] and demonstrated successfully in experiments [5], [6] in recent years, the study of a proper output system for such device has not been reported in the literature. Unlike the traditional gyrotrons of single-mode operation, the output of a gyro-multiplier contains two modes with one operating at the fundamental electron cyclotron resonance and the other being excited at one of the high-order harmonics.…”

Two-wave regime of operation of the high-harmonic gyrotron

“…(13)- (19). Naturally, in the single-wave regime, we assume that the far-from-cutoff wave 1 is absent, a 1 ðfÞ 0.…”

“…One should mention also two-wave schemes based on the frequency multiplication, 19,20 as well as the planar gyrotron. 21 The latter explores the idea to provide the transverse output of the radiated rf wave ( Fig.…”

Design of frequency selective surfaces for a gyro-multiplier output system

“…The operation of a gyro-multiplier is based on the traditional electron cyclotron resonance maser (ECRM) and frequency multiplication [1,2]. It is attractive in the terahertz band as the required strength of the external magnetic field is greatly reduced, compared to the traditional low-harmonic gyrotrons.…”