Non-monochromatic fields in a dispersive electrodynamic line. II. the continuous approximation

The discrete approximation for evaluation of the non-harmonic fields in a dispersive electrodynamic line with an electron beam has been described in the first part of the paper (ibid., p.220-221). This is universal and wideband approach. However, the normal eigenmode interpolation errors might be excessive, if the number N of the partial eigenmodes is small. Therefore, for regular lines (e.g., a periodic with the period D delay structure or uniform smoothbore waveguide), the continuous approximation, detailed in this paper, might be used.