Study of Micro Pixel Photon Counters for a high granularity scintillatorbased hadron calor.pdf

DESY 07-196 Study of Micro Pixel Photon Counters for a high granularity scintillator-based hadron calorimeter N. D’Ascenzo a,b,1, A. Eggemann b , E. Garutti b 7 0 a University of Hamburg, Edmund-Siemers-Allee 1, D-20146, Hamburg, Germany 0 2 b DESY, Notkestr. 85, D-22607 Hamburg, Germany v o N Abstract 8 ] A new Geiger mode avalanche photodiode, the Micro Pixel Photon Counter (MPPC), t e was recently released by Hamamatsu. It has a high photo-detection efficiency in the d - 420 nm spectral region. This product can represent an elegant candidate for the de- s n sign of a high granularity scintillator based hadron calorimeter for the International i. Linear Collider. In fact, the direct readout of the blue scintillation photons with s a MPPC is a feasible techological solution. The readout of a plastic scintillator by c i a MPPC, both mediated by the traditional wavelength shifting fiber, and directly s y coupled, has been systematically studied. h p [ 1 v 7 8 Introduction 2 1 . 1 The prototype of the highly granular hadronic calorimeter for the International 1 7 Linear Collider (Calice HCAL [1]) consists of finely segmented arrays of scin- 0 tillators. Each tile is read out by a Geiger mode avalanche photodiode[2,3,4] : v (the SiPM) produced by MEPHI (Moscow Engineering and Physics Institute), i X whose specific design matches the required performances needed for its appli- r 2 6 a cation in the calorimeter [5]. The small size