Beamline 10.0.1 delivers the photons from a 4.5 m long 10 cm periodicity undulator (U100) to various endstations in its
three branchlines. The beamline uses a spherical grating monochromator (SGM) to produce high energy resolution
photon beam, with three gratings to cover the photon energy range from 17 to 340 eV. Typically, angle-resolved
photoemission (ARPES) measurements use 30-70 eV photons. The beam size at the High Energy Resolution
Spectroscopy (HERS) endstation, designed for ARPES, is measured to be 250 μm (H) by 100 μm (V). Due to grazing
incidence geometry in the HERS endstation, the photon beam will have a large projection on the sample surface which
could lead to degradation of experimental resolutions. We are in the process of designing and replacing some of the
existing mirrors to improve the focus spot at HERS endstation. The detailed design parameters and possible upgrade
paths will be presented with verifications using SHADOW ray-tracing program.
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