Abstract
Modern e+e− factories with high luminosity require fast response time of the detector subsystems to collect the data efficiently and suppress severe beam background. The prototype of the electromagnetic calorimeter based on the counter made of pure CsI crystal, novel wavelength shifter with nanostructured organosilicon luminophores and avalanche photodiodes Hamamatsu S8664-55 is discussed. Results of the measurement of the basic characteristics of the counter are presented.
Highlights
Nowadays the project of the Super-Charm Tau Factory (SCTF) [1] is actively discussed in Budker Institute of Nuclear Physics
High luminosity of the Super-Charm Tau factory requires a fast response time of the detector subsystems to cope with high trigger rate and suppress severe beam background
The prototype of the electromagnetic calorimeter based on the standard counters with the CsI(pure) crystals, wavelength shifting (WLS) plates coated with NOL-9, avalanche photodiodes (APD) coupled to the plates and custommade charge sensitive preamplifiers was suggested
Summary
The main goal of experiments at SCTF is a precise study of processes with c-quarks and τ leptons Such physics program requires good energy and momentum resolution of the detector and a particle identification system with the best parameters among the detectors already existing or under construction. Crystals of pure CsI (CsI(pure)), with a scintillation decay time of 30 ns, allow one to reduce substantially pileup noise in the electromagnetic calorimeter. These crystals have notable light yield, high radiation hardness, handy mechanical properties, and acceptable price. The prototype of the electromagnetic calorimeter based on the standard counters with the CsI(pure) crystals, WLS plates coated with NOL-9, APDs coupled to the plates and custommade charge sensitive preamplifiers was suggested. In this paper we present several solutions to improve the characteristics of the standard counter
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