Behaviour of small Gap plus GEM chambers in close LHC conditions

摘要

Small Gap 4 GEM Chambers developed for the CMS experiment at the LHC were exposed to a pion beam of 350 MeV at the Paul Scherrer Institut to establish their radiation hardness with respect to the operating gain. The long-term stability of the gain (ageing) was then measured using an X-ray beam. CO 2002 Elsevier Science B.V. All rights reserved. References: 5