1. Instrumentation Division Seminar

    "Hybrid pixel detector developments for Synchrotrons and Free Electron Lasers at the Paul Scherrer Institute"

    Presented by Gemma Tinti, Paul Scherrer Institute, Italy

    Friday, September 18, 2015, 2 pm
    Large Conference Room, Bldg. 535

    The X-ray detector group at the Paul Scherrer Institute (PSI), Switzerland, has a long history in hybrid detector developments for use at the Swiss Light Source (SLS) and other synchrotrons worldwide. Initially, the development was based on single photon counting systems, like the world-renowned PILATUS and its successor EIGER. EIGER is characterized by 7575 m2 pixels and a frame rate as high as 23 kHz for a 4 bit counter. The rst detector systems are being integrated into beamline operations. Some experimental results and the challenges for the large area detector operations will be presented. The construction of the Swiss Free Electron Laser (FEL) at PSI and other FELs worldwide has shifted the developments towards charge integrating systems, which are able to sustain a high number of photons in pulses with a O(fs) length. The versatile JUNGFRAU detector has 7575 m2 pixels. It is characterized by single photon resolution and high dynamic range. These characteristics can be simultaneously achieved through a dynamic gain switching mechanism. Details on the detector concept and results on the characterization will be shown. A frame rate as high as 2 kHz prospects the use of the JUNGFRAU detector also at the SLS. The employment of charge integrating systems for synchrotron applications will allow to sustain higher rate capabilities, which are typically the major limitations in the use of single photon counting systems. Finally, the MONCH charge integrating detector, characterized by pixels as small as 25  25 m2, will be shown. These research project is meant to investigate perspectives for hybrid detectors in the soft/tender X-ray regime. Moreover, the small pixels and the possibilityto exploit the charge sharing e ect to achieve sub-pixel resolution, open possibilities for high resolution imaging at synchrotrons and with X-ray tubes.