Author/Authors :
Akopov، نويسنده , , N and Aschenauer، نويسنده , , E.C and Bailey، نويسنده , , K and Bernreuther، نويسنده , , S and Bianchi، نويسنده , , N and Capitani، نويسنده , , G.P. and Carter، نويسنده , , P and Cisbani، نويسنده , , E and De Leo، نويسنده , , R and De Sanctis، نويسنده , , E and De Schepper، نويسنده , , D.De and Djordjadze، نويسنده , , V and Filippone، نويسنده , , B.W and Frullani، نويسنده , , S and Garibaldi، نويسنده , , F and Hanse، نويسنده ,
Abstract :
The construction and use of a dual radiator Ring Imaging Cherenkov (RICH) detector is described. This instrument was developed for the HERMES experiment at DESY which emphasises measurements of semi-inclusive deep-inelastic scattering. It provides particle identification for pions, kaons, and protons in the momentum range from 2 to 15 GeV, which is essential to these studies. The instrument uses two radiators, C4F10, a heavy fluorocarbon gas, and a wall of silica aerogel tiles. The use of aerogel in a RICH detector has only recently become possible with the development of clear, large, homogeneous and hydrophobic aerogel. A lightweight mirror was constructed using a newly perfected technique to make resin-coated carbon-fiber surfaces of optical quality. The photon detector consists of 1934 photomultiplier tubes (PMT) for each detector half, held in a soft steel matrix to provide shielding against the residual field of the main spectrometer magnet.
