Speaker
Description
To advance particle detector research, a MAPS-based silicon pixel beam telescope has been developed, which will be used in the High-Energy Proton Beam Experimental Station (HPES). As part of the CSNS-Ⅱ upgrade project, HPES will provide a single-particle proton beam with adjustable energy ranging from 0.8 to 1.6 GeV. As the core detector system of HPES, the telescope comprises six ultra-thin telescope modules, each consisting of a Monolithic Active Pixel Sensor (MAPS), an auxiliary PCB board and an aluminum shield box with a cooling system. The material budget per module is about 0.061%X0, equivalent to 50 μm silicon and two layers of shield film with a thickness of 12.5 μm. Simulations indicate that the beam telescope can achieve a telescope resolution better than 2 μm using a 1.6 GeV proton beam. Additionally, an electronics system has been developed for the telescope, with each module equipped with a readout board for individual control. To accommodate DUTs with various sizes, a dedicated high-precision experimental station is available for the users, featuring two telescope arms for mounting the six telescope modules and a six-axis motion stage for the DUTs in the center. The system also includes a trigger detector and a trigger logic unit to provide proton-level trigger signals for both the telescope and the DUT. To validate the design, a prototype with six modules was tested using a 1.3 GeV electron beam. The results demonstrated a spatial resolution of 5.7 μm for the DUT and 2.7 μm for the telescope, with a detection efficiency exceeding 99.5%. Since the beam tests were performed with an electron beam at an energy lower than 1.6 GeV, the effect of multiple Coulomb scattering was more significant, resulting in a slightly worse telescope resolution compared to the simulation.
