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Beamlines

Beamlines in 2019

  UVSOR is one of the highest-brilliance light sources in the extreme-ultraviolet region among the synchrotron radiation facilities with electron energies of less than 1 GeV. The natural emittance of the UVSOR-III storage ring is as low as 17.5 nm-rad after the successful completion of the storage ring upgrade project (the UVSOR-III project) in 2012.
  Eight bending magnets and six insertion devices are available as synchrotron light sources at UVSOR. As of 2018 there are a total of fourteen operational beamlines, which are classified into two categories. Twelve of them are the so-called “Open beamlines”, which are open to scientists from universities and research institutes belonging to the government, public organizations, private enterprises and also those from foreign countries. The remaining two beamlines are the “In-house beamlines”, and are dedicated to the use of research groups within Institute for Molecular Science (IMS).
  There is one soft X-ray station equipped with a double-crystal monochromator, seven extreme ultraviolet and soft X-ray stations with grazing incidence monochromators, three vacuum ultraviolet (VUV) stations with normal incidence monochromators, two infrared (IR) stations equipped with Fourier Transform interferometers, and one direct radiation station located after two undulators installed in tandem, as shown in the appended table (next page) for all available beamlines at UVSOR in 2019. The details of the updates for several beamlines are the followings.
  BL4U, equipped with a scanning transmission soft X-ray microscope (STXM), is popular not only for academic users but also many industrial users. In FY2019, a new Fresnel zone plate, whose focal length is different from the previous one, was prepared to perform measurements with energy of photons from 55 eV. This zone plate makes users possible to perform Li K-edge measurements, which is important to study all solid state Li batteries.
  BL5U has been officially opened for users from 2016 as high energy resolution angle-resolved photoemission spectroscopy (ARPES) beamline. In FY2019, the latest version of ARPES analyzer has been installed (MB Scientific AB, A-1 analyzer Lens#5). Users can now use so-called “deflector mapping” for all kinetic energies and lens modes. By combining with the micro-focused beam (23 x 40 μm), users can perform measurements on small samples or inhomogeneous samples without changing sample position.
  In BL6U, which is one of the in-house beamlines, so-called “Momentum microscope (MM)”, which is an electronic spectroscopy with both the real space and momentum space resolution, has been installed in February 2020 (SPECS Surface Nano Analysis GmbH, KREIOS 150 MM). It will be upgraded to double hemispherical analyzer in FY2020 and will also be upgraded for spin-resolved measurements in the future.
  In June 2019, a serious vacuum leakage accident occurred from water cooling line at M0 mirror located at upstream of BL7B. It was installed 20 years ago, and cooling water made a hole through 1 mm thick copper pipe. Although the accident occurred during user operation, fortunately, the upper most valves of beamline was closed because of the vacuum interlock system and the effect was very limited to the storage ring. Since it was hard to repair the copper pipe quickly because of the limited space during the user operation, we decided to shut down BL7B during FY2019. In the meantime, we pumped the water cooling line with vacuum to stop the water leakage and investigated the stability of the beam spot position at endstation without water cooling of M0 mirror. According to the investigation, we concluded that the manual adjustment of M0 mirror angle for every 3 hours can make users perform experiments. BL7B will start to accept users from FY2020.
  All users are required to refer to the beamline manuals and the UVSOR guidebook (the latest revision in PDF format uploaded on the UVSOR web site in June 2018), on the occasion of conducting the actual experimental procedures. Those wishing to use the open and in-house beamlines are recommended to contact the appropriate beamline master (see next page). For updated information on UVSOR, please see http://www.uvsor.ims.ac.jp.


UVSOR Synchrotron Facility, Institute for Molecular Science
Kiyohisa TANAKA

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