SPECIFICITY OF SIMULATION OF LOW ENERGIES ACCELERATING STRUCTURES

Parameters of the H-resonator: the resonant frequency, the distribution of phases and amplitudes of the highfrequency field in the accelerating gaps are mainly determined by the load that forms the acceleration channel. When creating applied accelerators based on H-resonators, it is necessary to determine not only the parameters of the accelerating channel, but also the electrodynamics characteristics of the resonator, which have influence on the efficiency of high-frequency power use. The paper presents an analysis of the methods for modeling the load of accelerating H-resonators taking into account the stated requirements.

Polarization effect of fields on vacuum laser acceleration

Concerning laser-driven electron acceleration in vacuum, a comparison was made between using circularly polarized (CP) laser field and linearly polarized (LP) field. It has been found that the main advantage for using CP field is that its acceleration channel occupies relatively larger phase space, which can give rise to greater acceleration efficiency. This feature chiefly comes from the difference in the distribution of the longitudinal electric components of these two kinds of fields. One of the disadvantages with CP field is the “energy saturation” phenomenon as the laser intensity is sufficiently high, resulting from the enhanced Lorentz force component in CP field. Physical explanations of these characteristics are addressed as well.