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Beamlines in 2016

  Among the synchrotron radiation facilities with electron energies of less than 1 GeV, UVSOR is one of the highest-brilliance light sources in the extremeultraviolet region. 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 five insertion devices are available as synchrotron light sources at UVSOR. As of 2015 there are a total of fourteen operational beamlines, which are classified into two categories. Eleven 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 three 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 free electron laser beamline with no monochromator, as shown in the appended table (next page) for all available beamlines at UVSOR in 2016. 
  In November 2016, there was a serious vacuum leakage accident from water cooling line at a fourquadrant copper mask located at upstream of BL3U. It was installed 10 years ago, and cooling water made a hole through 1 mm thick copper pipe. Since the accident occurred just after user operation, all upper most valves of beamlines were closed and the effect was limited to the storage ring. The whole storage ring has been baked after the four-quadrant copper mask was removed. User operation was restarted from 17th January, which means users lost beamtime for five weeks. The pipe which made leakage will be modified to 3 mm thickness one and will be installed during the shutdown of 2017. There are three more similar type of masks installed in the storage ring, and they will be also replaced during the shutdown. Users who lost beamtime were reassigned to the open beamtime according to their request. If there was no beamtime left, users lost beamtime. The loss of beamtime will be considered during the peer review process of the next beamtime request in FY 2017. In BL4U, where there are many users from companies and minimum beamtime is one day, the rest of the whole beamtime was rescheduled.
  BL2A equipped with a double-crystal monochromator, where users can use the highest energy photons in UVSOR (~4 keV), has been used mainly for photoabsorption spectroscopy. Since there are users who want to evaluate the sample surface, a new chamber for X-ray photoemission spectroscopy (XPS) has been prepared offline. This system will be attached to BL2A during the shutdown of 2017.
  In BL3B, to achieve high efficiency VUV emission spectroscopy, a new endstation chamber has been designed and manufactured in 2016. It will be available from FY 2017.
  BL6B is an Infrared-THz beamline which has confocal type micro-spectroscope station, reflection/ transmission station, and IR microscope imaging station. To solve serious long term drift of beam path caused by M0 magic mirror thermal load, the feedback control system of M0 mirror angle by monitoring the reflection of visible laser from M0 mirror has been developed. This feedback control system has been routinely operated and successfully provide stable beam for users from this year.
  BL5U has been officially opened for users from 2016 as high energy resolution angle-resolved photoemission spectroscopy (ARPES) beamline. It became one of the most popular beamline in UVSOR, whose beamtime requests are about three times more than the beamtime. Space-resolved and spin-resolved function will be developed and installed in one year.
  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 2010), 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.


Kiyohisa TANAKA

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