Speaker
Dr
Christian Sandow
(PNSensor GmbH, Munich, Germany)
Description
The DSSC detector system, which is currently under development for the European XFEL, will be able to record X-ray frames with 1 Megapixel at a rate of 4.5MHz. The system is based on a silicon pixel sensor with a newly developed DEPFET as the central amplifier structure. The sensor will have a size of 200x200 mm2 and will be read out by 256 ASICs which are bump-bonded to the detector in order to provide full parallel readout. The signals from the sensor, after being processed by an analog filter, are digitized by 8-bit ADCs and locally stored in an SRAM. In order to fit the dynamic range of 104 photons of 1 keV per pixel into the input range of the ASIC while simultaneously achieving single photon resolution at 1keV, a strong signal compression is required. This compression is achieved by a non-linear characteristic which is inherent to a new DEPFET structure that combines an enhanced charge handling capacity with the excellent noise performance of the DEPFET.
The main building blocks of the system will be discussed with a special emphasis on sensor development and simulations. Moreover, we will present measurements with prototype readout ASICs and standard DEPFETs that have shown a very low noise which makes it is possible to achieve the targeted single photon resolution for 1keV photons at a frame rate of 4.5MHz.
Primary author
Dr
Christian Sandow
(PNSensor GmbH, Munich, Germany)
Co-author
Dr
Matteo Porro
(Max-Planck-Institut Halbleiterlabor, Munich, Germany)
