Author/Authors :
Davis، نويسنده , , R.A. and Gingrich، نويسنده , , D.M. and Pinfold، نويسنده , , J.L. and Rodning، نويسنده , , N.L. and Boos، نويسنده , , E. and Zhautykov، نويسنده , , B.O. and Aubert، نويسنده , , B. and Bazan، نويسنده , , A. and Beaugiraud، نويسنده , , B. and Boniface، نويسنده , , J. and Colas، نويسنده , , J. and Eynard، نويسنده , , G. and Jézéquel، نويسنده , , S. and Leflour، نويسنده , , T. and Linossier، نويسنده , , O. and Nicole، نويسنده ,
Abstract :
A separate liquid argon preshower detector consisting of two layers featuring a fine granularity of 2.5 × 10−3 was studied by the RD3 collaboration. A prototype covering approximately 0.8 in pseudo-rapidity and 9° in azimuth was built and tested at CERN in July 94. CMOS and GaAs VLSI preamplifiers were designed and tested for this occasion. The combined response of this detector and an accordion electromagnetic calorimeter prototype to muons, electrons and photons is presented. For minimum ionizing tracks a signal-to-noise ratio of 4.5 per preshower layer was measured. Above 150 GeV the space resolution for electrons is better than 250 μm in both directions. The precision on the electromagnetic shower direction, determined together with the calorimeter, is better than 4 mrad above 50 GeV. It is concluded that the preshower detector would adequately fulfil its role for future operation at CERN Large Hadron Collider.
