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  • An upgrade of the Argonne-Minnesota beamline was recently completed, one year after its starting date. The addition of a Seya monochromator to the existing ERG (Extended Range Grasshopper) monochromator has expanded the spectral range of the beamline to lower energies (5 - 40 eV).

    The combination of an ERG and a Seya signifies a unique capability - two types of electron spectroscopy, core and valence, may be performed at once. This is possible because the focus of both monochromators is at the same spot. The low energy photons provided by the Seya monochromator are used for the valence electronic structure studies, and are valuable for high-resolution angle-resolved photoemission experiments.

    The performance of the upgraded beamline has been tested with angle-resolved photoemission measurements on platinum foil, and the high-Tc superconductor YBa2Cu3O7. The flux and resolution results are within the range of expectation.

    The somewhat unusual ERG/Seya combination was originally designed and implemented by Cliff Olson on the Ames-Montana beamline at Aladdin. Rong Liu from Argonne National Laboratory was chiefly respon-sible for construction of the duplicate project, while Olson played an important consulting role. The optics, engineering and accelerator operations groups of SRC provided valuable advice and technical assistance. SRC benefits from the second ERG/Seya beamline by its ability to accommodate more experimental projects which require a wider spectral range.

    Rong Liu commented on the project by saying, "Most of the difficulties stemmed from the unique task of combining two monochromators into one beamline. In addition to making them fit physically, we had to align the common refocusing mirror in such a position that two beams could be focused at the same spot."