Abstract
A novel electron-optical system is proposed for dual azimuthally stacked radial sheet electron beams (ARSEBs). The two sheet beams are emitted from curved surfaces of two cathodes and are focused by a focusing electrode, which is carefully designed to produce a symmetric field distribution for the two beams and to avoid interference between the beams. A common tunable periodic cusped magnetic focusing system is also designed to focus the two ARSEBs. The dual sheet beams are used in a traveling wave tube (TWT) consisting of a cascade of two azimuthally supported angular log-periodic strip-line (ASALS) slow-wave structures (SWSs). The transmission efficiency in the presence of beam–wave interaction is 93%. The particle-in-cell simulation results show that for a beam voltage of 4400 V and a current of 0.39 A, the proposed cascaded TWT has a maximum gain of 32.5 dB at 35 GHz and a maximum output power of 180 W; this is a significant gain improvement over a TWT using a single ASALS SWS.
Highlights
traveling wave tube (TWT) have applications in high data rate communication, high-resolution radar, electronic countermeasures, spectroscopy, and so on
The dual sheet beams are used in a traveling wave tube (TWT) consisting of a cascade of two azimuthally supported angular log-periodic strip-line (ASALS) slow-wave structures (SWSs)
An EOS has been designed for novel azimuthally stacked radial sheet electron beams (ARSEBs)
Summary
TWTs have applications in high data rate communication, high-resolution radar, electronic countermeasures, spectroscopy, and so on. Increasing the beam-SWS separation can improve the beam transmission, but it reduces the efficiency of the beam–wave interaction In such a case, it is necessary to increase the number of periods in the microstrip SWS to achieve a high-power output. In order to overcome the disadvantages associated with microstrip SWSs, a novel type of planar SWS, namely, the ASALS SWS, has been proposed recently.7 This structure consists of a rather thick strip-line, which is supported between two dielectric rods.
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