The NTUHEP group is currently designing a BGO system to monitor the instant luminosity by measuring the back-to-back Bhabha events for BEAST2, a special detector for the commissioning of SuperKEKB and Belle2. The experiment of energy calibration will be introduced in the paper, the result shows BGO system can detect cosmic ray and the maximum event number is occurred at 15 to 20 photon-electrons.
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