Abstract
We report the results coming from an extensive study of a Shashlik calorimeter prototype for CMS. Nine (47 × 47 mm 2) towers were exposed to a high energy electron beam at CERN SPS and read out by silicon photodiodes followed by low noise preamplifiers. The main results are the measurements of: • -|the energy resolution: σ E (%)= (8.4±0.1) E ⊕ (0.37±0.03) E ⊕(0.8±0.2) ; • -|the shower resolution: σ x,y(mm)= 9.1±0.3 stat±0.7 syst E ⊕ 27±1.4 stat±2.1 syst E . • -|We also give the angular resolution of the direction of an electron shower. It is estimated by using one point from a preshower detector located at 3 X 0 and the second point on a barycenter in the calorimeter mosaic. The result is encouraging being in agreement with a resolution of σ θ( mrad) = 70 √E , which gives for an electron of 50 GeV an angular resolution of 10 mrad. • -|The uniformity of the calorimeter response is found to be better than ± 1%. • -|The mean light yield measured in Shashlik towers equipped with Y7 WLS fibres from Kuraray and aluminized at the front side of the tower is of the order of 12300 γ/ GeV assuming a quantum efficiency of 62.5% for the Si photodiode.
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