Calibration of the high resolution spectrometer barrel calorimeter at PEP

The High-Resolution Spectrometer (HRS) is a general-purpose detector for the study of high-energy electron-positron collisions. The HRS has been in data-taking operation since early 1982. This report covers the calibration of the barrel shower counter system. The barrel system consists of 40 modules placed in a circular arch having a mean radius of 2.1 m. Each module covers an azimuthal wedge of 9 degrees and has an active length of 3.0 m. There are three independent sections: (1) an inner sandwich of Pb and scintillator (NE110) of thickness 3 r.1., (2) a plane of 14 proportional wire cells equipped with charge-division read-out, and (3) an outer sandwich of Pb and scintillator (NE114) of thickness 8. r. 1. The light from the sandwich section is collected at both ends and is passed through long acrylic pipes (5 cm diameter, 162 cm long) to photomultipliers (Amperex XP2230) mounted outside the magnet steel.