Simulation of material budget measurements with beam telescopes

Abstract

High-precision particle tracking devices allow for a two-dimensional analysis of the material budget distribution of, e.g., particle detectors and their periphery. These tracking devices, called beam telescopes, enable a precise measurement of the trajectory of charged particles with a position resolution of a few micrometer and an angular resolution of the order of a few ten microradian. In this contribution, the material budget of a structured aluminium cube is reconstructed from various estimators based on the deflection angles of simulated electron trajectories. Probing a target under various rotation angles enables a tomographic reconstruction of the target. We discuss the performance of width estimators of the scattering angle distributions and their impact on the contrast and the resolution of the reconstructed two- and three-dimensional images. At a voxel size of 0.1 mm $\times$ 0.1 mm $\times$ 0.1 mm, we reconstruct the material budget with a contrast to noise ratio of $5.6\pm0.2$ and an edge resolution of about $(70\pm10)$ micrometre.