Large area GEMs and spherical GEMs

by Serge Duarte Pinto (CERN)

Friday 5 Feb 2010, 11:00 → 12:00 Europe/Zurich

40-S2-D01 (CERN)

Abstract: The Gas Electron Multiplier (GEM) is an established technology for high rate charged particle tracking. The luminosity upgrade of the LHC, and the consequent replacement of several subdetectors in the forward muon region of experiments, created a demand for GEMs of larger area than what could be made until recently. I will report on an R&D effort that introduced new techniques to eliminate the issues of the standard technique at large areas, and to adjust the fabrication method to industrial standards for mass production. We made a prototype large GEM chamber of 66x66 cm^2, which has been successfully tested. The spherical GEM project is a more recent technology development effort, to create GEMs with a spherical geometry. A detector based on such GEMs eliminates the parallax error when detecting neutral particles (photons, neutrons) using a gaseous converter. Making spherical GEMs and readout board, curved spacers and a conical field cage poses considerable technical challenges, most of which are now overcome. Detector Seminar webpage Organizer: Lucie LINSSEN - PH/LCD

Slides 100205PHseminar.pdf