Author/Authors :
Bencivenni، نويسنده , , G. and de Simone، نويسنده , , P. and Murtas، نويسنده , , Kevin F. and Lerner، نويسنده , , M.Poli and Bonivento، نويسنده , , W. and Cardini، نويسنده , , A. and Deplano، نويسنده , , C. and Pinci، نويسنده , , D. and Raspino، نويسنده , , D.، نويسنده ,
Abstract :
We report the results of a systematic study of the time performance of triple-GEM detectors operated with several gas mixtures which are new for this kind of detectors. We show that a considerable improvement, with respect to the traditional gas mixture Ar/CO2 (70/30), is obtained with the fast and high yield based CF4 and iso-C4H10 gas mixtures; time resolutions better than 5 ns. Discharge studies have been performed with high intensity π/proton beams at the Paul Sherrer Institute (PSI). The results show that the operation of the detector is very stable, if a small fraction of iso-C4H10 or a large amount of CF4, is use.
Keywords :
GEM , Discharge , Tracking , aging
