Hardware Detectors | Small Angle X-ray Scattering/Diffraction

BL4-2 Detectors

There are three different X-ray area detectors available for data collection at BL4-2:

	type	area [mm²]	resolution [px]	pixel size [µm]	frame rate [Hz]	dynamic range
Dectris Pilatus3 X 1M	single photon counting	168.7 x 179.4	981 x 1043	172	500	20 bit
Rayonix MX225-HE	CCD	225 x 225	3072 x 3072 2048 x 2048 1536 x 1536 768 x 768	73 (2x2 bin) 110 (3x3 bin) 146 (4x4 bin) 292 (8x8 bin)	<1	16 bit
Dectris Pilatus 300k	single photon counting	83.8 x 106.5	487 x 689	172	200	20 bit
Dectris Eiger2 X 1M (in commissioning)	single photon counting	77.1 x 79.7	1028 x 1062	75	2000	32 bit

- Dectris Pilatus3 X 1M Pixel Array detector: This is a single photon counting detector specially designed for synchrotron use. The x-ray sensor is a 450 µm thick reverse-biased silicon diode array. The noise-free images with the large 20 bit dynamic range obtained by this detector enable reliable SAXS data analysis even for the dilute samples. It has 981 x 1043 square pixels in a sensitive area of 168.7 mm x 179.4 mm, providing large area for capturing wide angular range of the scattered x-rays. It is integrated into Blu-Ice/DCS control software and can collect data with a frame rate of up to 500 Hz. This is the main detector used for most of the experiments.

Pilatus3 X 1M (left) and Rayonix MX225-HE (right) at the beamline — Pilatus3 X 1M (left) and Rayonix MX225-HE (right)

- Rayonix MX225-HE CCD Detector: This is a gapless fiber-optics coupled CCD detector consisting of 3 x 3 tiled array of back-illuminated CCD modules, with 225 mm x 225mm square active area, tiled without gaps in the imaging area and variable pixel size. It is optimized for high photon detection efficiency and equipped with a baseline stabilization in order to reduce fluctuations in the background level. It is used whenever gapless data frames are essential (e.g. for fiber diffraction) but can also be used for standard solution scattering instead of Pilatus3 X 1M. Maximum available resolution is 3072 x 3072 pixels in 2x2 binning mode with the 73 µm pixel size and can be run in 3x3, 4x4 and 8x8 binning modes for a faster readout and increased signal to noise. The detector can also be used as an alternative to the Pilatus3 X 1M for solution scattering as well as fixed target SAXS applications.
- Dectris Pilatus 300k Pixel Array detector: This is a small first generation Pilatus detector. It has 487 x 689 pixels in an 83.8 mm x 106.5 mm active area and can record images with the repetition rate of up to 200 Hz. It provides noise-free operation and large 20bit dynamic range. In case of technical issues with the Pilatus3 X 1M detector it can be used as an alternative detector for time-resolved experiments to guarantee continued operation.

- Dectris Eiger2 X 1M: This detector is currently in commissioning. It is a single photon counting detector and, like Pilatus3 X, is specially designed for synchrotron use. Fast acquisition rate of up to 2KHz makes it a great choice for time-resolved experiments. It has 1028x1062 pixels with 75 µm pixel size resulting in a 77.1 mm x 79.7 mm detector area.

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