The DSSC is a 1 Megapixel large area detector that is able to record soft X-ray images at the maximum frame rate of the FEL at 4.5 MHz. It is composed of 4 movables quadrants, each containing 4 ladders composed of two monolithic sensors with hexagonal shaped pixels. Two different sensor version exist. The first one (see article here) is based on Miniaturized Silicon Drift Detector (MiniSDD) pixel sensors and provides a linear response. The second one (see article here) is based on Depleted Field Effect Transistor (DEPFET) and provides non-linear response, giving it it’s name (DSSC = DEPFET Sensor with Signal Compression).
In pump-probe experiment, the MiniSDD DSSC is equipped with an additional Al filter making the minimum gaps between quadrants 4mm.