Results of the test of the Threshold Aerogel Cherenkov Detector at CERN PS T10 test beam channel

4 Abstract: Construction details and test beam results of a prototype of the ASHIPH type Threshold Aerogel Cherenkov Detector are presented. The spectrometric performance of this prototype based on a silica aerogel radiator with an extremely low refractive index (n = 1.008) was investigated. Experimental data required to study the feasibility of an aerogel Cherenkov detector as the ALICE VeryHMPID system have been obtained.