Abstract
A new design of a slow - wave structure of a “crossed staircase” type for a powerful broadband multi-beam X-band TWT has been considered. The use of dense packing of beams and diaphragms with bushings allows to increase the interaction impedance to 4-7 Ohm and the dispersion correction makes it possible to expand the band up to 18% using a special form of coupling slots. The calculation of electronics demonstrates a possibility of obtaining the power of 24 kW, gain of 17 dB and efficiency of 28% in the TWT with such a slow-wave structure. The design of the permanent magnet system with an interpole gap of 119 mm was developed which provides 100% transportation of the electron beam to the collector.
Highlights
The operating frequency band of a radar is a valuable resource that determines the capabilities of the station and the expansion of the band is one of the main tasks in the development of radars
It is known that a “helix” slow-wave structure (SWS) and a “looping waveguide” allow to provide a wide band, the first system has limitations in heat dissipation, and the second one has a low interaction impedance in the operating band
The design of a focusing magnetic system that creates a magnetic field of 0.17 Т in a working gap of 119 mm and has a weight of ~ 7.4 kg was developed and investigated
Summary
The operating frequency band of a radar is a valuable resource that determines the capabilities of the station and the expansion of the band is one of the main tasks in the development of radars. Klystrons and coupled-cavity TWTs usually provide a frequency band of no more than 5-6% [1,2,3,4]. We are considering a possibility of creating a TWT that covers 16% of the operating band with the output power of about 30 kW. The most important node of the broadband TWT is a slow-wave structure (SWS). It is known that a “helix” SWS and a “looping waveguide” allow to provide a wide band, the first system has limitations in heat dissipation (and in output power), and the second one has a low interaction impedance in the operating band. Broadband SWSs with high interaction impedance are in demand
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