Spiral Double Comb Loading The Injection Of Slow-wave Structure Of The Circular Waveguide - Wave Interaction Studies

When electronic moves along the Z axial under limited focusing-magnetic field, to electron beam itself as the carrier, it includes two longitudinal charge waves which is the fast space charge wave and the slow space charge wave, also it has four transverse waves, which is the fast cyclotron wave, the slow cyclotron wave, the fast synchronous wave and the slow synchronous wave. Space charge wave theory has been widely used in many microwave and millimeter wave devices, such as traveling wave tube, klystron, and some cross-field devices, these devices are using the interaction between the slow space charge wave and the high-frequency electromagnetic field to complete the energy exchange. And the fast space charge wave can be used for low-noise parametric amplifier design. Since the existence of space charge effect, these devices have shown a strong nonlinear characteristic. In contrast, the research on the transverse wave is relatively slow. However, in recent years, as electronic transverse wave device has some excellent characteristics, it began to attract the attention of many researchers. One branch of TWT, which is circularly polarized traveling wave tubes, because of its small volume, high efficiency and easy collection of electronic and other advantages, now, the researches has gradually formed a new direction of the microwave vacuum electronic devices.This paper is focused on the research of the interaction between the slow synchronous wave and the high-frequency electromagnetic field using HFSS 3D electromagnetic simulation software and MAGIC particle simulation program to simulate it.The main work of this paper is as follows:1. First of all, summing up the previous works on the analysis of circularly polarized traveling wave tube. On this basis, we analyzed what kind of electromagnetic field can be used to complete the beam - wave interaction, and analyzed the movement of a single electron under the polarization field.2. Using HFSS 3D electromagnetic simulation software to calculate the dispersion of the Slow-wave structure. 3. Using the MAGIC particle simulation program to simulate the beam - wave interaction. It includes two structures, namely, fan-shaped without ridges double helix and the fan-shaped ridged double helix. As a exploratory research, we have get a lot of physical images to explain the beam - wave interaction mechanism of the circularly polarized traveling wave tube, and get 8dB above signal gain and 11% of electronic efficiency.