|Electron drift velocity measurements at high electric fields|
|P. Colas, A. Delbart, J. Derre, I. Giomataris, F.Jeanneau, V. Lepeltier, I. Papadopoulos, P. Rebourgeard|
A method to measure the electron drift velocity is presented. A pulsed UV Ni- trogen laser is used to excite both the drift and cathode Nickel micromeshes of a Micromegas detector. The signals induced on the anode are then readout by a fast current amplifier. Several results have been obtained for various gas mixtures and electric fields from 10 V/cm to 14 kV/cm. Relevant applications with low (TPCs mode) and high (pre-amplification mode) electric fields will be discussed.