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Figure 1
High-speed beam chopper showing the small size of the housing. The reader is looking at the two sets of windows within the housing. On the right-hand side of the housing is an optical encoder that supplies the optical feedback for the motor speed regulation. For the present model a small fan must be used to cool the aluminium housing.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 7| Part 1| January 2000| Pages 1-4
doi:10.1107/S0909049599014582
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