Speaker
Description
This work presents the characterization of a full detector module based on the DECTRIS JUNGFRAU charge-integrating ASIC, developed to overcome the count-rate limitations of traditional counting detectors [1]. The module consists of 8 ASICs in a 512✕1024 active pixel array, bump-bonded to a monolithic 450 µm Si sensor, for an approximate sensitive area of 4✕8 cm². The Jungfrau ASIC features a three-level dynamic gain-switching mechanism adjusting the gain frame-by-frame and pixel-by-pixel based on the incoming flux, which was derived from the Jungfrau ASIC, developed by the Paul Scherrer Institut (PSI) [2]. This capability allows for the simultaneous recording of intense diffraction peaks and low-intensity background, maintaining a dynamic range up to 12,000 photons per pixel at 12 keV, with single-photon sensitivity down to 6 keV. The ASIC supports continuous readout at frame rates up to 2 kHz.
Performance evaluations of the 8-chip architecture focus on electronic noise, linearity, and the consistency of the gain-switching mechanism across the full active area. Uniformity measurements of gain transitions, gain dispersion, and pedestal stability are included. A calibration concept for the multi-chip system using X-ray sources and internal charge injection is presented.
The development of a multi-module detector system is described, aiming for a 4M pixel configuration. Preliminary results of measurements at the DESY and ESRF synchrotrons are presented, validating the system performance under high photon flux, either continuous or instantaneous, for applications in serial crystallography [3,4]. Proof-of-concept measurements performed with the multi-module system will be displayed. Additionally, technical requirements concerning calibration, thermal stability, and data readout will be discussed. These results demonstrate the scalability of the DECTRIS JUNGFRAU for experiments at 4th-generation light sources.
References:
[1] Fröjdh et al., Front. Phys. 12 (2024): 1304896.
[2] Mozzanica, A., et al., Synchrotron Radiation News, 31(6), 2018.
[3] Orlans, J., et al., Commun. Chem., 8(1), 2025.
[4] Leonarski, F., et al., IUCrJ, 10(6), 2023.