Figure 3
(a) Diffraction pattern from the cylindrical slit system. The cylinders were polished with 1/4 µm diamond paste. (b) Same diffraction pattern in completely evacuated surroundings, without attenuators or Be window. A 0.5 mm-diameter beamstop was used to protect the CCD from the direct beam. Strong asymmetry is visible. These patterns were recorded at 1.75 m from the slit (E = 8 keV). |