Abstract
Upgrade of KEKB Accelerator and Belle2 Detector are on going, aiming for starting physics data taking with 50 times higher instantaneous luminosity in FY2015. The belle electromagnetic calorimeter consists of CsI(Tl) crystals read out by two photodiodes, covering polar angle of 12–155 degrees. A total of 8736 counters are installed in a barrel and two endcap modules. The Belle2 upgrade of electromagnetic calorimeter is in two steps. For the beginning of Belle2, all readout electronics will be replaced to cope with higher event rate. A waveform sampling will be introduced to reduce an effect from severe accelerator background. Replacement of CsI(Tl) crystals to faster undoped CsI crystals are also planned. In the talk, detail of Belle2 upgrade will be presented as well as status of preparation and plans for crystal replacement.
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