Test Results of a MSGC Detector Module for the CMS forward MSGC-Tracker

We report on the construction and test beam results of a MSGC detector module with four trapezoidal elements arranged in a geometry as planned for the CMS forward tracker. Our objective is to study a concept for the forward detector modules which is easy to build with minimal contribution to the material budget. Signal to noise ratio and spatial resolution of the detector are studied for different bias voltages in a 100 GeV muon beam at CERN. a) Corresponding author 1 Introduction MicroStrip Gas Chambers (MSGC) are foreseen as one of the key detectors of the CMS tracking system. Detector modules have to be designed as well for the tracker barrel as for the forward region. The module which is described here is dedicated to the forward region. It is a closed system of four trapezoidal detector units mounted together in a segment of a ring (called detector module) with the read-out electronics and high voltage connections outside of the gas volume of the detector. 2 Concept of the det...