Plasma Loaded Periodic Slow Wave Structure

The coupled-cavity TWT has good heat–putout performance and high power capacity. But its instantaneous bandwidth is narrow. After filled with plasma in the drifting channel, its performance can be prominently improved. In this dissertation, the plasma photonics crystal is researched; the electromagnetic wave accurate expressions in the arbitrary magnetic field are obtained; By means of boundary conditions and the moment's method, the dispersion relations were gained. What's more, the dispersion characteristic in low-density plasma and high-density plasma loaded conditions were studied. The plasma space-charge wave and the formation of the hybrid modes were discussed.Main works are as follows:1.The plasma photonics crystal is researched. And an equivalent model is to describe. In this model, actual periodical distribution non-uniform plasma-grating was treated as uniform transverse and uniform axial medium...2.Based on this model, the dielectric constant in the arbitrary axial magnetic field is analyzed. Meanwhile, using field theory method, the expressions about electromagnetic field in the drifting channel of plasma filled Coupled-Cavity-TWT are obtained.3.By Maxwell Equations and the double component plasma particle linear movement equations, the plasma tensor and the electromagnetic field expressions in plasma full filled and partly filled drifting channel of Coupled-Cavity-TWT are obtained.4.Plasma filled Coupled-Cavity Chains are analyzed by using the divisional model and field theory method .General Transadmittance matrix are obtained by using method of moments and Dyad Green function. Moreover, dispersion characteristic in low-density plasma and high-density plasma loaded conditions are studied .The plasma space-charge wave and the formation of the hybrid modes are discussed.