Speaker
Description
To generate white beam with various polarization, we have designed and constructed tapered APPLE undulators. A typical APPLE adjusts the polarization and photon energy through four-axis phase motions and a single-axis gap change. In addition to these mechanisms, our design incorporates rotational and translational structures to further extend the accessible energy spectrum. In this configuration, the magnet arrays must rotate by more than 4 mrad, and such operation results in upstream and downstream gap differences exceeding 10 mm. Achieving reliable actuation for this substantial tapered motion is a critical task. The work reports the latest progress in the design, fabrication, and measurement of the tapered APPLE undulator.
Footnotes
Permanent magnet, Synchrotron radiation
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