ALBA Synchrotron
The beamline currently uses a single hybrid-pixel photon counting detector for (GI)SAXS and a CDD detector for (GI)WAXS experiments. The SAXS detector is supplied by Dectris (Pilatus3 S 1M) and the WAXS detector by Rayonix (LX255-HS).
Visitors to the line must consider the actual sample-to-detector distance and choose it correctly in order to record the data of interest. In this context you need to consider the active area of the detector that will allow you to record the q-range of interest. Moreover, you must bear in mind that the accessible q-range for both SAXS and WAXS recordings is a function not only of the sample-to-detector distance, but also of the energy of the monochromatic photon beam.
Detectors specifications
Pilatus3 S 1M (Dectris) | LX255-HS (Rayonix) | |
|---|---|---|
Mode | (GI)SAXS | (GI)WAXS |
Active image area | 168.7 x 179.4 mm2 (H x V) | 85 x 255 mm2 (H x V) |
Total number of pixels | 981 x 1043 pixels (H x V) | 1920 pixels x 5760 pixels (H x V) |
Pixel size (not binned) | 172 x 172 µm2 | 44.27 x 44.27 µm2 |
Frame rate | 25 frames/s | 10 - 140 frames/s (binning dependent) |
Dynamic range | 20 bits | 16 bits |
Working distances: The Pilatus detector can be placed from 2.1 to 7.2 m from the sample position, while the Rayonix detector has a maximum distance of 300 mm in GIWAXS configuration.
A micro ion chamber monitors the incoming beam intensity (I0) after the available fast shutter and before the sample, while the transmitted beam intensity (I1) is monitored using a photodiode on the corresponding beamstop.