ULTRA-SMALL-ANGLE X-RAY-SCATTERING WITH A BONSE-HART CAMERA ON THE HIGH BRILLIANCE BEAMLINE AT THE ESRF

We report on first experiments carried out on the high brilliance undu lator beamline (BW) at the ESRF. A Bonse-Hart camera was installed in order to examine the performance of the X-ray beam and its source for this type of experiments. The results show that excellent data can be obtained very fast. They belong to a scattering vector range which is partially covered by visible light scattering experiments. The limitin g problem is caused by diffuse scattering from the channel-cut crystal s (up to 5 reflections) but according to our results it should be poss ible to decrease this effect substantially by using a still higher num ber of reflections while still maintaining unprecedentedly high count rates and dynamic range due to the very bright source.