AUTHOR=Sztuk-Dambietz Jolanta , Rovensky Vratko , Klujev Alexander , Laurus Torsten , Trunk Ulrich , Ahmed Karim , Meyer Olivier , Möller Johannes , Parenti Andrea , Raab Natascha , Shayduk Roman , Sikorski Marcin , Ansaldi Gabriele , Bösenberg Ulrike , Luis Lopez M. , Muenich Astrid , Preston Thomas R. , Schmidt Philipp , Stern Stephan , Bean Richard , Madsen Anders , Gelisio Luca , Hauf Steffen , Gessler Patrick , Wrona Krzysztof , Graafsma Heinz , Turcato Monica TITLE=Operational experience with Adaptive Gain Integrating Pixel Detectors at European XFEL JOURNAL=Frontiers in Physics VOLUME=11 YEAR=2024 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2023.1329378 DOI=10.3389/fphy.2023.1329378 ISSN=2296-424X ABSTRACT=

The European X-ray Free Electron Laser (European XFEL) is a cutting-edge user facility that generates per second up to 27,000 ultra-short, spatially coherent X-ray pulses within an energy range of 0.26 to more than 20 keV. Specialized instrumentation, including various 2D X-ray detectors capable of handling the unique time structure of the beam, is required. The one-megapixel AGIPD (AGIPD1M) detectors, developed for the European XFEL by the AGIPD Consortium, are the primary detectors used for user experiments at the SPB/SFX and MID instruments. The first AGIPD1M detector was installed at SPB/SFX when the facility began operation in 2017, and the second one was installed at MID in November 2018. The AGIPD detector systems require a dedicated infrastructure, well-defined safety systems, and high-level control procedures to ensure stable and safe operation. As of now, the AGIPD1M detectors installed at the SPB/SFX and MID experimental end stations are fully integrated into the European XFEL environment, including mechanical integration, vacuum, power, control, data acquisition, and data processing systems. Specific high-level procedures allow facilitated detector control, and dedicated interlock systems based on Programmable Logic Controllers ensure detector safety in case of power, vacuum, or cooling failure. The first 6 years of operation have clearly demonstrated that the AGIPD1M detectors provide high-quality scientific results. The collected data, along with additional dedicated studies, have also enabled the identification and quantification of issues related to detector performance, ensuring stable operation. Characterization and calibration of detectors are among the most critical and challenging aspects of operation due to their complex nature. A methodology has been developed to enable detector characterization and data correction, both in near real-time (online) and offline mode. The calibration process optimizes detector performance and ensures the highest quality of experimental results. Overall, the experience gained from integrating and operating the AGIPD detectors at the European XFEL, along with the developed methodology for detector characterization and calibration, provides valuable insights for the development of next-generation detectors for Free Electron Laser X-ray sources.