Construction and Performance Studies of Large Resistive Micromegas Quadruplets

Two resistive Micromegas quadruplet detectors with trapezoidal shape and an area of 0.5 m 2 were constructed, serving as prototypes for the future chambers of the ATLAS New Small Wheel (NSW) upgrade. Each quadruplet consists of two double-sided readout panels and three drift panels (one double face), equipped with a micromesh, the drift electrode and gas pipes. There are four detection layers each with an active area of 0.3 m 2 . Two layers have readout strips parallel to the base of the trapezoid while the other two have strips inclined by 1.5 with respect to the first ones. In this paper we present the first results for the performance of the detectors, in test-beam measurement and cosmic ray tests.