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.
@article{arxiv.0909.3197,
title = {MICROMEGAS chambers for hadronic calorimetry at a future linear collider},
author = {C. Adloff and D. Attie and J. Blaha and S. Cap and M. Chefdeville and P. Colas and A. Dalmaz and C. Drancourt and A. Espargiliere and R. Gaglione and R. Gallet and N. Geffroy and I. Giomataris and J. Jaquemier and Y. Karyotakis and F. Peltier and J. Prast and G. Vouters},
journal= {arXiv preprint arXiv:0909.3197},
year = {2009}
}