Design and performance of ESRF high‐power undulator front‐end components

A new high‐power front‐end has been developed and installed at the European Synchrotron Radiation Facility. The new design consists of the replacement of the X‐ray absorber and the filtering system. An upstream pre‐slit and a compact high‐heat‐load absorber have replaced the X‐ray absorber. A chemical‐vapour‐deposition diamond window has replaced the beryllium window and graphite filters usually employed. Commissioning has been successfully performed on the ID23 test front‐end equipped with three U34 undulators producing synchrotron radiation with a total power of 11 kW and a peak power density of 1200 W mm−2at normal incidence.