Detector Seminar

X-ray, electron and ion imager developments at DESY

by Heinz Graafsma (CFEL; DESY Hamburg, Germany. University of Mid Sweden, Sundsvall.)




The Photon-Science Detector group at DESY is responsible for the development and deployment of new detectors for the photon sources in Hamburg: PETRA III; FLASH and the European XFEL. Due the different nature of the sources and the large span of photon energies different systems were developed. The toughest challenge was posed by the European X-ray Free-Electron Laser (Eu.XFEL), with its extreme peak intensity and 4.5 MHz repetition rate. From the beginning it was clear that only custom designed systems would be able to meet those challenges. The Adaptive Gain Integrating Detector (AGIPD) system is one of three projects for the Eu.XFEL. In this system each pixel individually and fully automatically adapts its gain to the incoming signal strength during the pulse, and with that provides at the same time low-noise performance for weak signals, allowing distinguishing between single photons, and high dynamic range for strong signals. In addition to the large dynamic range the AGIPD system also provides high speed imaging up to 6.5 MHz. The first system was deliver and installed at the Eu.XFEL, and successfully used for the very first user experiments in fall 2017. A short overview of its performance will be given.

Another challenge is presented by the low-energy FELs like FLASH. In order to be able to reliably detect photons down to 250 eV a system based on back-illuminated CMOS imagers is developed. This system, PERCIVAL, has a different adaptive gain structure providing single photon sensitivity as well as a large dynamic range. The results obtained with the first 2-million pixel monolithic sensors will be presented.

In the next decade the PETRA storage ring will be upgraded to a diffraction limited source, and the European XFEL will be extended with a CW-mode operation. Although the final parameters of the sources are not yet fixed, it is clear that the two sources, from a detector point of view are becoming more similar. We therefore, have started a development program for a high-speed imager. The design goals, and first of ideas of the implementation will be presented and discussed.

Zoom connection details are given in the invitation email.

Organized by

Michael Campbell (EP-ESE)