Beam Tests of the Second Prototype of a Cherenkov Counter for the ALICE T0 Detector

<HTML> <HEAD> <h2>Abstract</h2> </HEAD> <P> <BODY> <P> The second prototype of a Cherenkov counter consisting of a quartz radiator (cylinder 26 mm in diameter, 30 mm long) and a PMT Hamamatsu R3432-01 has been tested in a 1.28 GeV/c pion beam. A consta...

Descripción completa

Detalles Bibliográficos
Autores principales: Kaplin, V A, Karakash, A I, Loginov, V A, Rakhmanov, A L, Kurepin, A B, Maevskaya, A I, Rasin, V I, Reshetin, A I, Akindinov, A V, Martemyanov, A N, Sheinkman, V A, Smirnitsky, A V, Grigoriev, V A
Lenguaje:eng
Publicado: 2000
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/689149
Descripción
Sumario:<HTML> <HEAD> <h2>Abstract</h2> </HEAD> <P> <BODY> <P> The second prototype of a Cherenkov counter consisting of a quartz radiator (cylinder 26 mm in diameter, 30 mm long) and a PMT Hamamatsu R3432-01 has been tested in a 1.28 GeV/c pion beam. A constant fraction discriminator EG&G was used at the output of the PMT. Measurements in a beam with a limited cross-section 0.8 x 0.8 cm2 gave a 50 ps time resolution of the detector. In a "broad-beam" geometry the time resolution of the detector was measured to be 55 ps. In both cases an off-line correction was used due to inadequate characteristics of the CFD, confirmed by the measurements at laboratory conditions using a pulsed laser. Another type of a CFD (4000M) properly adjusted using a pulsed laser and optical filters provided a 55 ps resolution in a "broad-beam" geometry without any off-line correction. Monte-Carlo simulations of p-p collisions show, that an averaging procedure for the signals coming from the two arrays of the T0 detector significantly improves the time resolution for the T0 signal. At a 50 ps resolution of each array, the resulting resolution for the T0 signal is equal to 40 ps the fluctuation of the vertex position and of the particles' velocities being taken into account. </BODY> </HTML>

Ejemplares similares