7.2 Gain Matching
Since an electromagnetic shower will spread beyond the dimensions of an
individual CsI crystal, intercalibration effects and energy losses play an
important role for the energy resolution. Optimizing the energy resolution
requires a precise gain matching and proper cluster summation. On top of this
the knowledge of the differences between positron initiated showers and photon
initiated showers - and hence the response function of the calorimeter - is
critical for the accuracy of our experiment.