Contribution Oral presentation
Threshold aerogel Cherenkov counters of the KEDR detector
Particle identification system based on aerogel threshold Cherenkov counters ASHIPH (Aerogel SHifter PHotomultiplier) was installed in the KEDR detector in 2013. The system consists of 160 counters arranged in two layers and contains 1000 liters of aerogel with refractive index 1.05 and 160 MCP PMTs with multialkali photocathode. The efficiency of relativistic particles registration was measured. Long term stability of ASHIPH counters was studied. The main factors of efficiency degradation are presented.