Design and simulation of the High-Energy Proton Beam Telescope

Abstract

A high-resolution beam telescope is essential for the precise characterization of silicon pixel sensors. As part of the CSNS-II upgrade project, a High-Energy Proton Beam Telescope (HEPTel) based on monolithic active pixel sensors (MAPS) has been designed for the forthcoming High-Energy Proton Experimental Station (HPES), which will provide 0.8 to 1.6 GeV single-particle proton beams. HEPTel consists of six ultra-thin telescope modules, with a material budget per module of about 0.061% X0. Simulated with a 1.6 GeV proton beam, the telescope is expected to achieve a resolution of about 1.83 micrometers. Additionally, a dedicated readout electronics system and a Data Acquisition (DAQ) system have been designed for HEPTel, based on which a preliminary test system was established for beam tests. The beam test results with 1.3 GeV electrons demonstrated a single-module resolution of about 5.77 micrometers, an overall telescope resolution of about 2.70 micrometers, and a detection efficiency above 99.5%. These results validate the HEPTel design and confirm its capability for forthcoming proton-beam experiments at HPES.

Figures (11)

• Figure 1: Schematic of the proton bunch structure and the micropulses time structure at HPES, showing macropulses of 1–2 ms duration repeating every 40 ms.
• Figure 2: Schematic layout of the HEPTel setup at HPES, illustrating the relative positions of the beam telescope, trigger detectors, and other detector systems.
• Figure 3: The simulated residual distributions of the DUT in the X (left) and Y (right) directions using 1.6 GeV protons.
• Figure 4: The simulated residual width as a function of the proton beam energy ranging from 0.8 to 1.6 GeV.
• Figure 5: (a) The simulated residual width of the DUT versus the distance between the DUT and its nearest telescope planes. (b) The simulated residual width of the DUT versus the distance between telescope planes.