The bunching system based on the evanescent oscillations

The report presents design and simulated performances of the S-band electron bunching system based on coupled cavity chain in which the on-axis field amplitude changing substantially from the cell to the cell. For realization of such field distribution the operating frequency of the bunching system, which is close to the eigen frequency of the last cell, is higher than frequency of the "/spl pi/" mode of the rest part of the bunching system. Cell lengths are chosen in the way to get the effective bunching and accelerating of the beam from the initial energy of 25 keV to the energy about 1 MeV with the current of 300 mA. The bunching system can be used in electron linacs both for fundamental researches and for radiation technologies.