CERENKOV FIBER SAMPLING CALORIMETERS

Clear optical fibers were used as a Cerenkov sampling media in Pb (ele ctromagnetic) and Cu (hadron) absorbers in spaghetti calorimeters, for high rate and high radiation dose experiments, such as the forward re gion of high energy colliders. The fiber axes were aligned close to th e direction of the incident particles (1-degree-7-degrees). The 7 lamb da deep hadron tower contained 2.8% by volume 1.5 mm diameter core cle ar plastic fibers. The 27 radiation length deep electromagnetic towers had packing fractions of 6.8% and 7.2% of 1 mm diameter core quartz f ibers as the active Cerenkov sampling medium. The energy resolution on electrons and pions, energy response, pulse shapes and angular studie s are presented.