CoSAXS will have two detectors, housed within the vacuum vessel. The SAXS detector is an Eiger2 X 4M, specification below. The WAXS detector will be available from 2021.

Specification for Eiger2 4M SAXS detector
Number of detector modules2 x 4
Sensitive area (width x height) [mm²]155.1 x 162.2
Pixel size [µm²]75 x 75
Total number of pixels2068 x 2162 = 4,471,016
Gap width vertical / horizontal [pixels]12 / 38
Energy discriminating thresholds2
Count rate capability [photons/s/pixel] 10⁷
Point-spread function1 (FWHM)
Silicon Sensor thickness [µm]450
Data formatHDF5 / NeXus
Vacuum CompatibleYes
Frame rate [Hz]750 (500 stable)
Energy range [keV]6.0 – 40
Dimensions (WHD) [mm³]235 x 237 x 372
Weight [kg]15

A beamstop (2 mm in diameter) with integrated photodiode will be in front of the SAXS detector.