Achromatic Translation System for Charged Particle Beams

Abstract

An assembly of bending magnets and magnetic quadrupole lenses was found which causes the axis of a beam of charged particles of momenta p±Δp to be shifted from its original axis to a parallel line displaced from its original axis by a distance d. A study of this transport system demonstrates that it is possible to choose the parameters of the system in such a way that the entire system has an acceptable effect on the transverse motion of the beam, and so that the system is achromatic to first order in Δp/p. A typical transport system is given, and results are presented in graphical form for a range of parameters encompassing the typical values.