Effects of the electric field on the electron drift velocity in a double-GEM detector in different gas mixtures

A study of the electronic drift velocity in a double-GEM detector is presented. We compare measurements and simulations done to investigate the effects of the induction parameters-electric field and gap-for different gas mixtures Ar/CH4(90/10), Ar/C2H6(75/25), Ar/Xe/CO2(64/16/20) and Ar/Kr/CO2(76/19/5) at atmospheric pressure using 5.9 keV X-rays. We used 2, 4 and 6 mm deep induction gaps and induction fields varying up to 6 kV/cm.