G4beamline simulation for rotating telescope at SLRI BTF

Abstract

A plan to upgrade the ALICE Inner Tracking System has been proposed, and the Monolithic Active Pixel Sensor, a novel silicon sensor technology, will be employed. The silicon sensor is planned to be investigated with a rotating telescope at the Synchrotron Light Research Institute Beam Test Facility using a 1.2 GeV electron beam. A part of this work is to investigate the pixel sensor telescope when the angle of the Device Under Test (DUT) plane changes. Simulation has been performed with the G4beamline software. Once a G4beamline simulation is completed, a ROOT file is produced. Beam profiles and correlation plots are then analyzed. This data was used to calculate the scattering angle, which was found to be between 0.171 and 0.178 mrad when the DUT plane is perpendicular to the test beam. Furthermore, the simulation result has been compared and agrees with the theoretical calculation within 4.8% error.