Author/Authors :
Barnyakov، نويسنده , , A.Yu. and Barnyakov، نويسنده , , M.Yu. and Bobrovnikov، نويسنده , , V.S. and Buzykaev، نويسنده , , A.R. and Danilyuk، نويسنده , , A.F. and Degenhardt، نويسنده , , C. and Dorscheid، نويسنده , , R. and Finogeev، نويسنده , , D.A. and Frach، نويسنده , , T. and Gulevich، نويسنده , , V.V. and Karavicheva، نويسنده , , T.L. and Kononov، نويسنده , , S.A. and Kravchenko، نويسنده , , E.A. and Kurepin، نويسنده , , A.B. and Kuyanov، نويسنده , , I.A. and Muelhens، نويسنده , , O. and Onuchin، نويسنده , , A.P. and Ovtin، نويسنده , , I.V. and Razin، نويسنده , , V.I. and Reshetin، نويسنده , , A.I. and Schulze، نويسنده , , R. and Talyshev، نويسنده , , A.A. and Usenko، نويسنده , , E.A. and Zwaans، نويسنده , , B.، نويسنده ,
Abstract :
In June 2012 we tested a Focusing Aerogel RICH detector prototype based on Digital Photon Counters (DPC) by Philips at the CERN PS T10 beam line with a particle momentum up to 6 GeV/c. The prototype comprises a 20×20 cm2 photon detector with 48×48 DPC pixels. In order to reduce the dark count rate, the photon detector was cooled to −40 °C in addition to disabling individual DPCʹs microcells. A four layer focusing aerogel radiator with 200 mm focal distance was studied. We obtained a Cherenkov angle resolution of 3.61±0.04 mrad. The mean number of photoelectrons in a ring is 12. Directly measured π / K separation at 6 GeV/c momentum is 3.5 σ , μ / π separation is 5.3 σ at 1 GeV/c. A comparison with a Monte Carlo simulation is presented as well.
