Title :
The OPAL silicon-tungsten calorimeter front end electronics
Author :
Anderson, B.E. ; Anderson, K. ; Charalambous, A. ; Cotta-Ramusino, A. ; Dallavalle, M. ; Evans, H. ; Eyring, A. ; Foucher, M. ; Giacomelli, R. ; Giles, A. ; Gross, S. ; Guillot, M. ; Görlitz, W. ; Hammartstrom, R. ; Hart, J. ; Hart, P. ; Hillier, S. ; Jov
Author_Institution :
Dept. of Phys. & Astron., Univ. Coll. London, UK
fDate :
8/1/1994 12:00:00 AM
Abstract :
A pair of small angle silicon-tungsten (Si-W) calorimeters has been built to measure the luminosity to a precision better than 0.1% in the OPAL experiment at the Large Electron Positron (LEP) collider at CERN near Geneva. Each calorimeter contains 19 layers of tungsten (W) plates and silicon (Si) detectors, corresponding to a total of 22 radiation lengths, sampled by about 1 m2 of detectors divided into 304×64 independently read out channels. A complete electronics system has been developed, from the preamplifier up to the VME read out and control interface. It includes a fast trigger based on analogue sums. This paper describes how a large number of channels have been implemented in a dense environment, thanks to the use of ASIC´s directly bonded on the detector
Keywords :
application specific integrated circuits; calorimeters; detector circuits; nuclear electronics; semiconductor counters; ASIC; OPAL; Si; Si-W calorimeters; VME readout; W; control interface; fast trigger; front end electronics; preamplifier; Detectors; Educational institutions; Electrons; Extraterrestrial measurements; Particle measurements; Physics; Shape measurement; Silicon; Structural beams; Tungsten;
Journal_Title :
Nuclear Science, IEEE Transactions on
