Speaker
Description
The Jungfrau family of detectors has been developed by the Paul Scherrer Institute (PSI), Switzerland. These are state of the art pixel detectors, using integrating front-end electronics and adaptive gain, to deliver a very large dynamic range. This type of architecture, developed for FELs, will be increasingly used at upgraded synchrotron light sources. Jungfrau detectors are based on 0.5 Mpixel modules, which are then tiled to cover larger areas. Challenges associated with the architecture include the need to record and subtract dark images, and very high data rates before saving to disk in a compressed format.
At Diamond Light Source, UK, a 1 Mpixel Jungfrau (Jungfrau-1M) has been evaluated, using a laboratory X-ray machine and on the macromolecular crystallography beamline, I24. A nonlinearity was seen around the switching points, which has also been commented on by other authors. The performance of the detector with known protein samples was nevertheless very good.
Following the initial work with the JF-1M, a 9 Mpixel Jungfrau (JF-9M) was installed on Beamline I24. This was challenging in terms of networking and data rates, the provision of a cooling system for of the detector and safety interlocking.
We describe the challenges of installing and using the Jungfrau detectors and the solutions chosen, including the use of a QuantaGrid S74G-2U server for data acquisition. This is based on the NVIDIA Grace Hopper superchip and allows background subtraction and application of gain coefficients on the fly.
We present performance measurements of the detectors, from laboratory work and on the Beamline, and experimental results from protein samples.