R. Lahmann
University of Maryland, College Park
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nuclear science symposium and medical imaging conference | 1994
B. Anderson; Kelby Anderson; A. Charalambous; A. Cotta-Ramusino; M. Dallavalle; H. Evans; A. Eyring; M. Foucher; R. Giacomelli; A. Giles; S. Gross; M. Guillot; W. Gorlitz; R. Hammartstrom; J. C. Hart; P. A. Hart; S. J. Hillier; P. Jovanovic; T. Kawamoto; R. G. Kellogg; R. Lahmann; M. Mannelli; U. Mueller; J. Pilcher; O. Runolfsson; B. Schmitt; W. Springer; D. Strom; M. Tecchio; D. L. Wagner
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 ASICs directly bonded on the detector. >
