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Figure 5
(a) Measurement set-up for the beam divergence and radiation source size. The first slit set S1 controls the acceptant angle of the BPMs, whereas BPM1 and BPM2 scan beam profiles at 6.6 and 9.49 m, respectively. (b) Cross-section view of the vertical or horizontal BPM, which consists of a Ta plate electrically insulated from the water-cooled copper housing by Macor spacers and a sapphire plate of good thermal conduction between the Ta plate and the copper housing. Two front slots (12 × 1 mm and 12 × 0.4 mm) separated by 15 mm can be selectively used for beam-profile scans, based on the steady photoelectrical current of the shielded Ta plate upon receiving irradiation.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 16| Part 1| November 2009| Pages 97-104
doi:10.1107/S0909049508034134
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