VARIATIONAL ABERRATION THEORY FOR MAGNETIC DEFLECTION SYSTEMS WITH CURVED AXES AT EXTRA-LARGE ANGLES

Variational deflection aberration theory has been further developed fo r deflection systems with curved axes at extra-large deflection angles (up to 120 degrees). The variational method allows us to calculate se cond- and third-order deflection-aberrations with respect to a curved axis by means of gradient operations on eikonal (the function of optic al length), All second- and third-order deflection aberrations have be en explicitly expressed in: compact and appropriate formulae suitable for computer computations, It is to be expected that the variational d eflection aberration theory may be useful in designing high-quality ma gnetic deflection systems for high-deflection television color picture tubes.