EFFECT OF NONUNIFORMITY ON THE ENERGY RESOLUTION OF EM SAMPLING CALORIMETERS

The response of a sampling tile electromagnetic calorimeter was simula ted for incident electrons in the 10-500 GeV energy range. The influen ce of tile to tile nonuniformity on the a and b coefficients of the ca lorimeter energy resolution parametrisation formula was investigated i n detail. An energy resolution deterioration due to nonuniformity was observed, but it was shown that by calibrating the towers individually one can reduce this undesirable effect to reasonable limits. An expli cit a and b coefficients dependence on sigma(non), the tile response n onuniformity standard deviation, was found. Our previous results on th is dependence obtained by analytical methods using the electromagnetic shower mean profile universal parametrisation and the present results obtained by Monte Carlo simulation are compared and found to be in go od agreement.