Author/Authors :
Aggarwal، نويسنده , , M.M. and Badyal، نويسنده , , S.K and Bhatia، نويسنده , , V.S. and Chattopadhyay، نويسنده , , S and Dubey، نويسنده , , A.K. and Majumdar، نويسنده , , M.R.Dutta and Ganti، نويسنده , , M.S. and Ghosh، نويسنده , , P and Kumar، نويسنده , , A and Nayak، نويسنده , , T.K and Mahajan، نويسنده , , S and Mahapatra، نويسنده , , D.P and Mangotra، نويسنده , , L.K and Mohanty، نويسنده , , B and Pal، نويسنده , , S and Phatak، نويسنده , , S.C، نويسنده ,
Abstract :
A honeycomb detector consisting of a matrix of 96 closely packed hexagonal cells, each working as a proportional counter with a wire readout, was fabricated and tested at the CERN PS. The cell depth and the radial dimensions of the cell were small, in the range 5–10 mm. The appropriate cell design was arrived at using GARFIELD simulations. Two geometries are described illustrating the effect of field shaping. The charged particle detection efficiency and the preshower characteristics have been studied using pion and electron beams. Average charged particle detection efficiency was found to be 98%, which is almost uniform within the cell volume and also within the array. The preshower data show that the transverse size of the shower is in close agreement with the results of simulations for a range of energies and converter thicknesses.
Keywords :
Proportional counter , Photon multiplicity detector , Preshower detector , ALICE experiment
