About the properties of cylindrical mirrors for the accounting of electrons with the azimuthal component of velocity. The focusing and focus line

The work of a cylindrical mirror with allowance for electrons having an azimuthal velocity component was studied. Possible implementations of the ring-ring scheme are considered. The classical definition of focusing to the case of the presence of azimuthal electrons is extended. The relationships between the main parameters of a cylindrical mirror (generalized second-order focal line), such as the source-detector distance, the radius of the emission ring, the position (radius) of the output diaphragm, the focusing energy, the starting angle of the central trajectory for all received ring-ring realizations are found.