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Figure 4
Sketch of the U15 cross section highlighting its main components. The closed frame, which is fabricated from mineral cast, is made of two parts: the bottom and the top sides (in blue) and the left and the right sides (in green). The latter supports the vacuum chamber. The moving wedge (in yellow), the counter wedge (in light brown) and the outer I-beam (in light blue) together form the gap drive system, the position of which is precisely controlled with three linear encoders. Inside the vacuum chamber, the inner I-beam supports the magnetic structure. This is pre-assembled into a series of aluminium extruded elements, referred to as block-keepers. The electrical cabinet (top left, in yellow) houses the control system and the power supplies of all servo motors (in black). The U15 undulator rests on a cam shaft mover system (on the bottom) which can displace the undulator in the vertical and horizontal direction, as well as orient it in the three Euler angles (pitch, yaw and roll). It is fixed on plates that are integrated below ground level.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 3| May 2018| Pages 686-705
https://doi.org/10.1107/S1600577518002205
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