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The cold parameters including the dispersion properties and the average interaction impedance of a sheath eccentric helix slow-wave structure in a circular waveguide are investigated. With the applications of orthogonal properties of the helix modes and Graf’s addition theorem for modified Bessel functions, the closed-form characteristic equations concerning the helix modes are derived rigorously...
To achieve a narrow-band THz coherent Cherenkov radiation, the excited wakefield should be periodic and has a sin-like profile in time domain. Because the the wakefield pulse is similar to the driven bunch shape, the condition of narrow-band THz radiation is determined by a simple expression and verified by the commercial software CST PS.
In this paper, the electromagnetic scattering from a conducting circular cylinder coated with an elliptic dielectric cylinder is derived rigorously by using the mode-matching technique. The effects of dielectric loss on scattering cross section are presented here by numerical techniques.
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