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A cantilevered liquid-nitrogen-cooled silicon mirror for the Advanced Light Source Upgrade.

  • Author(s): Cutler, Grant
  • Cocco, Daniele
  • DiMasi, Elaine
  • Morton, Simon
  • Sanchez Del Rio, Manuel
  • Padmore, Howard
  • et al.
Abstract

This paper presents a novel cantilevered liquid-nitrogen-cooled silicon mirror design for the first optic in a new soft X-ray beamline that is being developed as part of the Advanced Light Source Upgrade (ALS-U) (Lawrence Berkeley National Laboratory, USA). The beamline is optimized for photon energies between 400 and 1400 eV with full polarization control. Calculations indicate that, without correction, this design will achieve a Strehl ratio greater than 0.85 for the entire energy and polarization ranges of the beamline. With a correction achieved by moving the focus 7.5 mm upstream, the minimum Strehl ratio is 0.99. This design is currently the baseline plan for all new ALS-U insertion device beamlines.

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