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A highly segmented NaI(Tl) detector with vacuum photodiode readout for measuring electromagnetic showers at the CERN ISR |
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| Authors: | R Batley JC Berset H Breuker V Burkert R Carosi V Chernyatin Y Choi WE Cleland P Dam B Dolgoshein S Eidelman CW Fabjan I Gavrilenko U Goerlach Y Goloubkov M Harris P Ioannou T Jensen WJ Willis |
| Affiliation: | 1. University of Athens, Greece;2. Physikalisches Institut, Univ. Bonn, FRG;3. Brookhaven National Laboratory, Upton, NY, USA;4. CERN, Geneva, Switzerland;5. Lebedev Institute, Moscow, USSR;6. Moscow Physical Engineering Institute, Moscow, USSR;7. Novosibirsk Institute of Nuclear Physics, Novosibirsk, USSR;8. University of Pisa, Italy;9. University of Pittsburg, PA., USA |
| Abstract: | In this report we describe construction and performance of two identical units of electromagnetic shower counters which were installed in the axial-field spectrometer at the CERN-ISR in 1982 to provide improved detection of photons and electrons over a 1.3 sr solid angle of the AFS calorimeter. Thallium doped sodium-iodide in the form of small blocks served as an active shower material. Vacuum photodiodes and low-noise charge sensitive electronics were used for the deposited energy measurement and signal amplification. The stable performance of the detectors over a period of more than 18 months until the closure of the ISR has proven that vacuum photodiodes can reliably be utilized in highly modularized large scale detectors operating in a high magnetic field environment. |
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