Scintillators

In the COSY-11 experiment plastic scintillators are used to detect charged reaction products. There are three different detectors types:

thin scintillator segments (45×10×0.4 cm³ (S1) and 45×1.35×0.2 cm³ (S2), 17 segments each) behind the drift chambers measure the number of charged particles and serve as a start detector for a time-of-flight measurement
a scintillator wall (220×100×5 cm³ (S3)) read out by a matrix of 217 photomultipliers serving as a position sensitive detector and as stop for the time-of-flight measurement
thin scintillators in front of the silicon counters

Scintillation counters detect charged particles by the light which is produced when a particle transverses the scintillating material. The light is collected by light guides and measured by photomultipliers.

Rear view of the S1 scintillator
Side view of the S1 scintillator
Side view of the S1 and S2 scintillator mounted to the second drift chambers stack
Side view of the S3 scintillator with 217 photomultipliers

Back to the

Home Page.

Last updated: 8-December-1997 by T.Sefzick