Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 73: Detektoren und Detektorsysteme 1
T 73.1: Gruppenbericht
Dienstag, 5. März 2013, 16:45–17:05, GER-052
Preamplifier development for high count-rate, large dynamic range readout of inorganic scintillators — •Irakli Keshelashvili, Werner Erni, Michael Steinacher, and Bernd Krusche — Klingelbergstrasse 82, 4056 Basel, Schweiz
Electromagnetic calorimeter are central component of many experiments in nuclear and particle physics. Modern “trigger less” detectors run with very high count-rates, require good time and energy resolution, and large dynamic range. In addition photosensors and preamplifiers must work in hostile environments (magnetic fields). Due to later constraints mainly Avalanche Photo Diodes (APD’s), Vacuum Photo Triodes (VPT’s), and Vacuum Photo Tetrodes (VPTT’s) are used. A disadvantage is their low gain which together with other requirements is a challenge for the preamplifier design.
Our group has developed special Low Noise / Low Power (LNP) preamplifier for this purpose. They will be used to equip PANDA EMC forward end-cap (dynamic range 15’000, rate 1MHz), where the PWO II crystals and preamplifier have to run in an environment cooled down to -25oC. Further application is the upgrade of the Crystal Barrel detector at the Bonn ELSA accelerator with APD readout for which special temperature comparison of the APD gain and good time resolution is necessary.
Development and all test procedures after the mass production done by our group during past several years in Basel University will be reported.