Determination of the gamma current at GIF++ from MM electrical current measurements

The MicroMegas chambers for Atlas New Small Wheel upgrade are submitted to a series of meticulous tests. At the GIF++ facility the stability of the chambers is tested in a condition of gamma irradiation produced by the a Cesium 137 source with a dominant decay mode at 662 keV. This chambers are subjected to an elevated gamma flux which provoke discharges inside the gas gaps. My summer student project was to evaluate, through the simulation of the MM chambers, the gamma current and the stability.