Abstract
A brief review of research activity on gyrotron traveling-wave tube amplifiers (gyro-TWTs) with helically corrugated waveguides developing by the Institute of Applied Physics and GYCOM (Nizhny Novgorod, Russia) will be presented.
Highlights
The gyrotron traveling wave tube is known as a broad-frequency-band variety of gyrotrontype amplifiers having potential for production of the highest average or continuous-wave (CW) power in the millimeter wavelength range [1] and it is attractive as a microwave source for a number of applications such as radars, telecommunication and some other
Since 2009 eleven tubes were manufactured by IAP and GYCOM Ltd., tested and shipped to customers
The actual topics of research on the gyro-TWT are as follows: a cascade of two tubes ensuring the highest gain and output power in W band (Fig. 2) [9]; various microwave systems for inputting and outputting the radiation to and from a tube through one window [7, 8, 10]; tubes operating at the third cyclotron harmonic [11]; tubes prospective for DNP-NMR spectroscopy (260 GHz) [12]; tubes generating periodical sequences of ultrashort phasecoherent pulses [13]
Summary
The gyrotron traveling wave tube (gyro-TWT) is known as a broad-frequency-band variety of gyrotrontype amplifiers having potential for production of the highest average or continuous-wave (CW) power in the millimeter wavelength range [1] and it is attractive as a microwave source for a number of applications such as radars, telecommunication and some other. Since 1996 we are developing a concept of a gyroTWT that is based on the use of a helically corrugated waveguide that radically changes the dispersion of the modes of a circular waveguide [2]. The operating helicalwaveguide eigenmode has sufficiently high and almost constant group velocity at zero axial wavenumber which enables broadband operation of the helical-waveguide gyro-TWT with minimum sensitivity to electron velocity spread [3]. A number of experiments have proved the main theoretical predictions and advantages of gyroTWTs of this type [4,5,6]
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