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Figure 8
Focus size measurements (a) taken with the film at the focus position. The focus position was determined with an accuracy of 1 mm. (b) Three-dimensional image of the focus in (a). There is a noticeable saturation in the image even for a low exposure time (1 s). Attenuators were not used to avoid focus spreading owing to the scattering in the attenuator foils. (c) Derivative of the knife-edge measurements taken by scanning the right-hand slit (horizontal divergence). (d) Derivative of the knife-edge measurements taken by scanning the left-hand slit (horizontal divergence). (e) Derivative of the knife-edge measurements taken by scanning the top slit (vertical divergence). (f) Derivative of the knife-edge measurements taken by scanning the bottom slit (vertical divergence). By taking the average values between the right-hand and left-hand and bottom and top we found a focus size of 25 (V) µm × 32 (H) µm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 18| Part 6| September 2011| Pages 862-870
doi:10.1107/S0909049511031098
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