# MICROMEGAS chambers for hadronic calorimetry at a future linear collider

## TL;DR

This paper reports on the development and testing of MICROMEGAS chambers with fine segmentation for hadronic calorimetry, including gas gain studies, response uniformity, efficiency, and digital readout integration.

## Contribution

It introduces a new bulk MICROMEGAS prototype with embedded digital electronics and comprehensive testing in particle beams.

## Key findings

- Gas gain depends on pressure, temperature, and gap thickness.
- High detection efficiency and uniform response achieved.
- Successful integration of digital readout electronics.

## 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.