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The OPAL silicon-tungsten calorimeter front end electronics

By: Anderson, B.E.; Anderson, K.; Zankel, K.; Wagner, D.; Tecchio, M.; Strom, D.; Springer, W.; Schmitt, B.; Runolfsson, O.; Pilcher, J.; Mueller, U.; Mannelli, M.; Lahmann, R.; Kellogg, R.G.; Kawamoto, T.; Jovanovic, P.; Hillier, S.; Hart, P.; Hart, J.; Hammartstrom, R.; Gorlitz, W.; Guillot, M.; Gross, S.; Giles, A.; Giacomelli, R.; Foucher, M.; Eyring, A.; Evans, H.; Dallavalle, M.; Charalambous, A.; Cotta-Ramusino, A.;

1994 / IEEE


This item was taken from the IEEE Periodical ' The OPAL silicon-tungsten calorimeter front end electronics ' 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 m/sup 2/ of detectors divided into 304/spl times/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.<>