Calibration of the non-linear system response of a prototype set-up of the DSSC detector for the European XFEL

Abstract

The DSSC (DEPFET Sensor with Signal Compres sion) is a new instrument with non-linear compression of the input signal in the sensor and with parallel signal processing (filtering, linear amplification, and digitization) for all pixels. The DSSC will serve as 2d imaging detector at the European X-ray Free Electron Laser (XFEL.EU) currently under construction in Hamburg, Germany. The DSSC design goal is to achieve at the same time single photon detection and high dynamic range of about 10 4 photons, both for photon energies down to 0.5 keY and read-out speeds up to 4.5 MHz. Realization of this goal requires an accurate calibration of the non-linear system response (NLSR) over the full dynamic range of the detector. We present our strategy for calibrating the NLSR, for each of the 1024 x 1024 DSSC pixels, in the laboratory. The feasibility of our calibration strategy is demonstrated experimentally by calibrating the NLSR of a DSSC prototype set-up consisting of a prototype DEPFET sensor with non-linear signal compression connected to a prototype read-out ASIC.

Methods for calibrating the gain and offset of the DSSC detector for the European XFEL using X-ray line sources

“…Offset and gain of the DSSC can be calibrated by utilizing X-ray calibration lines [8,9]. In order to count single photons of a known energy, e.g.…”

“…The DSSC's non-linear system characteristic (NLSC, see also section 2) describes the relation between the signal charge collected in a sensor pixel and the respective digital output of the system. A calibration strategy for the NLSC of the DSSC detector has been proposed [8,9] and a first experimental validation has been given [10]. An update on the calibration strategy and results is presented in these proceedings [11].…”