# Multidétecteur 4$\pi$ INDRA Simulation de la géométrie et étude des détecteurs au silicium

Abstract : INDRA is a 4π detector of charged particles (p,d,t,α) and fragments (at least Z = 30) with an excellent space coverage (>80%). It consists of an assembly of 96 ionization chambers, 180 Silicon detectors (30 <θ<450), 324 caesium iodide scintillation detectors, and 12 NE102/NE115 scintillation detectors (20<θ<30) distributed on 17 concentric rings. The detection thresholds are low and the dynamic range in energy is large (minimum 1000). A simulation of INDRA has been carried out in order to assist its technical realisation, the preparation of some experiments, and to guide the analysis of the experimental results according to the most frequently demanded areas of the multidetector. Specifically, identification matrices, both ionization chamber - silicon and caesium iodide - silicon, have been simulated to investigate these factors. The construction of the ring 4-5 (70<θ<140) defines and suggests solutions for the major problems that will be encountered during the construction of the other rings, especially with the mechanical mounting of the silicon detectors. In addition, the study of the electronics associated with the silicon detectors has shown the necessity: - to devise specific amplifiers, on account of the excessive electronic noise of the amplifiers usually used. - to modify the manufacturing criteria of some of the silicon detectors manufacturing criterium (the metallization thickness on the side N+, the choice of high resistivities)
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• HAL Id : in2p3-00011192, version 1

### Citation

N. Copinet. Multidétecteur 4$\pi$ INDRA Simulation de la géométrie et étude des détecteurs au silicium. Instrumentations et Détecteurs [physics.ins-det]. Université de Caen, 1990. Français. ⟨in2p3-00011192⟩

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