Abstract
The Enhanced X-ray Timing and Polarimetry mission (eXTP) represents a next-generation flagship satellite for X-ray astronomy. A critical component of eXTP is the Large Area Detector (LAD), which consists of 40 modules, each equipped with a set of 4 × 4 microchannel plate (MCP) collimators. The optical characteristics of the MCP are essential for the observational capabilities of the eXTP-LAD. In this study, we provide a detailed description of the point-to-point soft X-ray test equipment. The measurements of the point spread function (PSF) of the collimators reveal discrepancies when compared to theoretical predictions. Specifically, the full width at half maximums (FWHM) and angular resolution are larger than expected, primarily due to the channel errors. The simulation results are consistent with the measured results and demonstrate that channel errors and inner wall roughness significantly impact the optical performance of collimators.
Published Version
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