BELLE is an experiment at the KEK B-factory. Its goal is to study the origin of CP violation.  (http://bsunsrv1.kek.jp/).

 The main purpose of the electromagnetic calorimeter is the detection of photons from B-meson decays with high efficiency and good resolution.

 In order to satisfy above requirements, we will use a highly segmented array of CsI(Tl) crystals with silicon photodiode readout installed inside the coil of the solenoid magnet.