MICROMEGAS chambers for hadronic calorimetry at a future linear collider

physics.ins-det

/ Authors

C. Adloff, D. Attie, J. Blaha, S. Cap, M. Chefdeville, P. Colas, A. Dalmaz, C. Drancourt, A. Espargiliere, R. Gaglione

and 8 more authors

R. Gallet, N. Geffroy, I. Giomataris, J. Jaquemier, Y. Karyotakis, F. Peltier, J. Prast, G. Vouters

/ Abstract

Prototypes of MICROMEGAS chambers, using bulk technology and analog readout, with 1x1cm2 readout segmentation have been built and tested. Measurements in Ar/iC4H10 (95/5) and Ar/CO2 (80/20) are reported. The dependency of the prototypes gas gain versus pressure, gas temperature and amplification gap thickness variations has been measured with an 55Fe source and a method for temperature and pressure correction of data is presented. A stack of four chambers has been tested in 200GeV/c and 7GeV/c muon and pion beams respectively. Measurements of response uniformity, detection efficiency and hit multiplicity are reported. A bulk MICROMEGAS prototype with embedded digital readout electronics has been assembled and tested. The chamber layout and first results are presented.