New approach to timing: the fast--fast system

A dual channel constant fraction timing discriminator incorporating multiple energy windows and coincidence logic has been developed. Incorporation of energy discrimination and fast coincidence logic into the timing channel has distinct advantages in terms of system simplicity, stability and data rates. A prototype applying the F2 approach has been constructed and tested. The system gives a 60Co FWHM of approximately 210 psec at a singles rate of greater than 7.5 x 105 sec-1 (approximately 1200 coincidences/sec)