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New readout electronics for the Venus liquid argon calorimeter at TRISTAN

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5 Author(s)
Fukushima, Y. ; Nat. Lab. for High Energy Phys., Ibaraki, Japan ; Shirai, J. ; Unno, Y. ; Tanaka, R.
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New readout electronics for the Venus end-cap liquid argon calorimeter was developed and has been operating for over a year at TRISTAN. The entire system was designed in such a way that the gain of each readout channel could be calibrated to better than 1%. The system consists of 3840 channels of readout electronics. It uses hybrid charge-sensitive amplifiers located in the 7.5-kG magnetic field and TKO-bus-based electronics which consists of CR-(RC) 4 filters, sample-and-hold circuits and 14-bit ADCs (analog digital converters). The energy resolution σE/E for an electromagnetic shower has been found to be 3.5% at 28 GeV without any channel-by-channel gain calibration. The resolution was also determined to be σE/ E=1.4%+11.3%/√E(GeV) from a large sample of 28-GeV Bhabha events and a small sample of e+e-→e+ e-γ events

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Nuclear Science, IEEE Transactions on  (Volume:36 ,  Issue: 1 )