A theory of static deflection in magnetically immersed conical deflectrons

A theory of static deflection is presented for conical deflectrons immersed in a uniform axial magnetic field. Both twisted and untwisted deflectrons are considered. Such arrangements for deflecting low-energy electron beams find applications in vidicons, scan converters, and similar devices. The equations of electron motion are solved analytically. Deflection sensitivity, scan rotation angle, and beam landing angle follow from the solutions. It is shown that beam landing error cannot be eliminated in conical deflectrons as it can be in cylindrical deflectrons. Several numerical examples illustrate the uses of these results.