Two large-area anode-pad MICROMEGAS chambers as the basic elements of a pre-shower detector

Laurent Aphecetche (1) , H. Delagrange (1) , D. G. d'Enterria (1) , M. Le Guay , X. Li (1) , Gines Martinez Garcia (1) , M. J. Mora (1) , P. Pichot (1) , Daniel Roy (1) , Y. Schutz (1)

1 SUBATECH - Laboratoire SUBATECH Nantes

The design of a detector based on MICROMEGAS (MICRO MEsh GAseous Structure) technology is presented. Our detector is characterized by a large active area of 398(\\times)281 mm(^{2}), a pad read-out with 20(\\times)22 mm(^{2}) segmentation, and an uniform amplification gap obtained by insulating spacers (100 (\\mu)m high and 200 (\\mu)m in diameter). The performances of several prototypes have been evaluated under irradiation with secondary beams of 2 GeV/c momentum charged pions and electrons. We consider such a detector as the basic element for a pre-shower detector to equip the PHOton Spectrometer (PHOS) of the ALICE experiment. Its assets are modularity, small amount of material, robustness and low cost.

Domaines: Instrumentations et Détecteurs [physics.ins-det]

Laurent Aphecetche, H. Delagrange, D. G. d'Enterria, M. Le Guay, X. Li, et al.. Two large-area anode-pad MICROMEGAS chambers as the basic elements of a pre-shower detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001, 459, pp.502-512. ⟨10.1016/S0168-9002(00)01044-5⟩. ⟨hal-00009526⟩