The present thesis focuses on the simulation study of a Micromegas detector by applying the Time Projection Chamber (TPC) method, using the Garfield++ toolkit. The purpose of this work is to investigate the detector response and reconstruction accuracy under different geometrical and electrical conditions, emphasizing the influence of the drift gap size and the incident track angle. Simulations were carried out for Micromegas geometries with drift gaps of 10 mm, 20 mm, and 30 mm and a constant drift field of −300 V/cm. In addition to the main configuration using a threshold on the strip charge, an extra simulation case for the drift gap of 30 mm at Edrift = −300 V/cm was performed without applying any charge threshold on the readout strips, in order to directly compare the impact of thresholding on the reconstructed signals and cluster properties. Moreover, for the geometry with a 30 mm drift gap, two additional electric field values were investigated, −200 V/cm and −400 V/cm, specifically for the largest incident track angles considered in this work. These cases were included to explore how variations in the drift field strength influence electron transport and track reconstruction performance under extreme geometrical conditions. In addition, the Garfield++ framework was used to simulate the process of particle interactions, electron drift, avalanche multiplication, and signal induction on the readout strips. The produced ROOT files, which included information such as charge distribution and drift time, were later combined and analyzed to extract key performance parameters. Furthermore, a reconstruction procedure based on the TPC method was developed in order to determine track parameters and evaluate the spatial resolution. The study analyzed the dependence of cluster size and drift time on the incident angle, as well as the impact point distributions between the simulated and reconstructed hit positions. Different drift gap configurations were studied in order to evaluate the detector performance before the construction of new Micromegas prototypes. The goal was to identify which configuration provides the best compromise between spatial resolution and signal quality. In the end, the results of the applied method are presented, leading to conclusions and discussions on the future prospects of the subject.
Χριστίνα Αντωνιάδου (Wed,) studied this question.