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Figure 8
The Jülich chopper. Panel (a) shows a photograph of the chopper with its vacuum flange removed. Panel (b) shows a schematic of its triangular rotor. The open time function, shown in panel (c), has a trapezoidal shape and, by changing h, the distance to the center of the X-ray beam from the rotor edge, the opening time can be set to transmit only one [panel (d)] or several [panel (e)] X-ray pulses.

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