Characterization of the eXTP-LAD collimators

The enhanced X-ray Timing and Polarimetry mission (eXTP) is a next-generation flagship X-ray astronomy satellite currently in phase-B study. The large Area Detector (LAD) on board eXTP contains 40 modules, each consisting of a set of 4 × 4 large area SDDs and 4 × 4 collimators, and has a designed effective area of 3.0 m ^2 at 8 keV and a Field of View (FoV) of 1 ^∘ . To achieve such a large effective area, the collimator’s Open Area Ratio (OAR) should be greater than 70