Title :
New readout electronics for the Venus liquid argon calorimeter at TRISTAN
Author :
Fukushima, Y. ; Shirai, J. ; Unno, Y. ; Tanaka, R. ; Murakami, H.
Author_Institution :
Nat. Lab. for High Energy Phys., Ibaraki, Japan
fDate :
2/1/1989 12:00:00 AM
Abstract :
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
Keywords :
calorimeters; electron-positron interactions; electron-positron scattering; nuclear electronics; photon production; 14-bit ADCs; Ar; Bhabha events; CR-(RC)4 filters; TKO-bus-based electronics; TRISTAN; Venus liquid Ar calorimeter; charge-sensitive amplifiers; electromagnetic shower; electron+positron producing electron+positron+gamma; electron+positron scattering; energy resolution; readout electronics; sample-and-hold circuits; Analog-digital conversion; Argon; Chromium; Digital filters; Energy resolution; Magnetic circuits; Magnetic fields; Magnetic separation; Readout electronics; Venus;
Journal_Title :
Nuclear Science, IEEE Transactions on
