The use of WLS fibers in a hadronic calorimeter for the HyperCP experiment

Preliminary results are presented on the operational aspects of an iron-scintillator sampling hadronic calorimeter used in the HyperCP experiment at Fermilab during the 1996-1997 fixed target run. The calorimeter used wavelength shifter fibers for light collection from scintillator sheets. Details of how the 2 mx2 mm fibers were polished, sputtered, and used for the readout are discussed. The average reflectivity of the sputtered fibers was 0.85±0.05, and the average attenuation lengths were 3.48±0.34 m. The calorimeter was designed to trigger on the proton (anti-proton) from Λ(bar Λ) decays, suppressing triggers from secondary interactions and background muons. copyright 1998 American Institute of Physics