2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87507The Inner Tracker System of the HERA-B experiment at DESY consists of 184 Microstrip Gas Chambers (MSGC) with a total number of 147 456 electronic read out channels. The detectors have to cope with particle fluxes up to 25 kHz/mm**2 and to tolerate radiation doses of 1 Mrad per year. During the development of these chambers it was found that conventional MSGC, operated in intenses hadronic fluxes, are rapidly destroyed due to induced discharges. The introduction of a Gas Electron Multiplier (GEM) as pre-amplification structure offers the possibility to build robust and reliable detectors allowing for ample gain reserve in the hostile environment of HERA-B.17 pages, 15 figures.Paper presented at the 36th Workshop of the INFN Eloisatron Project on New Detectors, 1.-7. November 1997, Erice, ItalyInstrumentation and DetectorsHigh Energy Physics - Experimenttext