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1st International Conference on Micro Pattern Gaseous Detectors (MPGD2009), Kolympari : Grèce (2009)
A MICROMEGAS chamber with embedded DIRAC ASIC for hadronic calorimeter
R. Gaglione1, C. Adloff1, M. Chefdeville1, A. Espargilière1, N. Geffroy1, Y. Karyotakis1, R. De Oliveira2

DIRAC is a 64 channel mixed-signal readout integrated circuit designed for Micro-Pattern Gaseous Detectors (MICROMEGAS, Gas Electron Multiplier) or Resistive Plate Chambers. These detectors are foreseen as the active part of a hadronic calorimeter for a high energy physics experiment at the International Linear Collider. Physics requirements lead to a highly granular hadronic calorimeter with up to thirty million channels, and probably only one or two bits channel readout (so-called digital calorimeter). The DIRAC ASIC has been especially designed for these constraints. Each channel of the DIRAC chip is made of a 4 gains charge preamplifier, a DC-servo loop, 3 switched comparators and a digital memory, thus providing additional energy information for a hit. A bulk MICROMEGAS detector with embedded DIRAC ASIC has been build. The tests of this assembly, both in laboratory with X-Rays and in a beam at CERN are presented, demonstrating the feasibility of a bulk MICROMEGAS detector with embedded electronics. The second version of the ASIC, with improved noise and additional functionalities, has just been received and preliminary results are reported in details.
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2 :  CERN - European Organization for Nuclear Research
Physique/Physique/Instrumentations et Détecteurs
Gaseous detectors – Calorimeters – Electronic detector readout concepts (gas – liquid) – CMOS readout of gaseous detectors