What is the beam size used for the measurements?

The beam size used for our measurements is approximately 0.05–0.075 mm in diameter. The beam is focused on the detector position using transfocators. This minimizes beam divergence and leads to improved instrumental resolution. Despite the relatively small beam size, we are still able to achieve a good powder average  for powders with crystallite sizes on the order of < 5 microns by vibrating and shaking the samples during the measurement.