“…The most promising detector type for this application are single-photon-counting pixel detectors (Bro È nnimann et al, 2000). They provide a large dynamic range, high rate capability, low noise performance, very fast data readout, suf®cient spatial resolution and can be assembled to large area detectors (Barna et al, 1995;Beauville et al, 1997;Fischer et al, 1999). A 2k  2k system with 200 mm  200 mm pixels is under development at the SLS.…”