Redesign of the CKM RICH velocity spectrometers for use in a unseparated beam

We report here a redesign of the CKM RICH velocity spectrometers for use in a 1 4 GHz unseparated beam adapted to the KTeV beam line and detector hall at Fermilab (P940). The redesigns reported here comprise modest modification to the original designs for CKM(E921) to accommodate the change in beam flux, momentum, and momentum bite of the primary beam. The ultimate performance of the velocity spectrometer systems, as quantified by the missing mass squared resolution for K + → π + π 0 , remains largely unchanged from the original design.