A Time Projection Chamber (TPC) using micro-pattern gas detectors is planned as the main tracking device for a detector at the next Linear Collider. A novel support structure for Gas Electron Multipliers (GEMs), which minimizes the material and improves the flatness of the foils, has been developed and tested with multiple GEM modules in a large TPC prototype at DESY. Reducing dead material at the GEM module boundaries improves the field homogeneity. In addition, it was shown in simulation that a field shaping ring at the border of the module can improve the charge collection in regions with non-homogeneous fields. This shaping wire was integrated into the module design and a successful test beam campaign with three modules has been carried out. First results regarding resolution and field distortions will be discussed.
@article{arxiv.1309.1370,
title = {GEM Module Design for the ILD TPC},
author = {T. Behnke and F. Müller and A. Münnich and K. Zenker},
journal= {arXiv preprint arXiv:1309.1370},
year = {2015}
}
Comments
Proceeding for the MPDG conference 2013 in Zaragoza, Spain