Calibration of the CDF Tile-Fiber Endplug Calorimeters Using Moving Radioactive Sources

摘要

The use of moving radioactive gamma sources to assess, calibrate and monitor scintillating tile calorimeters is discussed, and the techniques and equipment are described. The capabilities of the technique are illustrated using Cs~(137) sources with the CDF Endplug Upgrade EM and Hadron Calorimeters at testbeams and at a cosmic ray test stand. Source measurements of all the tiles int estbeam modules which are exact replicas of teh calorimeters, predict the relative responses of EM towers to 50 GeV positrons and muons, and of Hadron towers to 50 GeV pions, with RMS accuracies of 1.3percent, 1.8percent and 2.0percent, respectively. Source measurements will be used in lieu of testbeam measurements for the initial calibration of all towers in the final calorineters. Source measuremnets of single tiles are reproducible to 0.4percent and will be used to monitor gain changes of the photomultiplier tubes.