Preface
This Activity Report covers scientific and technological activities carriedout using the UVSOR-III Synchrotron in FY2021 (April 2021 - March 2022).
We present scientific examples of how the users study at the UVSOR
Synchrotron Facility.
The present UVSOR-III Synchrotron is one of the most advanced lowenergy SR facilities of the 3rd generation SR in the world and is now oneof the critical resources to accelerate the investigation of molecularscience. The UVSOR-III Synchrotron has a small electron storage ring but
has powerful 6-undulator beamlines (3 VUV and 3 in-vacuum soft X-rayundulators) with 8-dipole beamlines. We continue improving and upgrading
our micro- and nano-scale photoabsorption and photoemission approaches
and in situ/operando measurements in the IR, VUV, and soft X-ray regions, based on our strategic international
collaboration program in molecular science. We are grateful to all the people who use our facility and support
our efforts.
UVSOR operates for 40 weeks/year (ca. 2,200 h user time), accepts ~230 proposals, about ~600 individual
researchers counting total ~4,000 people*day/year. Most users stay for one or two weeks for experimenting. To
continue high-level achievements in science and technology at the UVSOR-III Synchrotron, our in-house staff
is constantly committed to maintaining and improving high-performance accelerators and beamlines. Research
activity has been affected by COVID-19 worldwide, however, the daily life of scientists seems to be renovated.
Of course, it has impacted overseas researchers who cannot travel to Japan. We support some of their researchby doing the experiment on their behalf.
In terms of personnel, Assitant professors, Takuji Ohigashi and Masaki Fujimoto left UVSOR. They will kindly
support the beamlines by cross-appointment contract in FY2022. The support office staff, Hisayo Hagiwara
retired, who has been dedicated as a secretary for a quite long time since the early days of UVSOR.
On the experimental side, technology development will not stop, hence we will make a progress on theimaging-related techniques to inspire advanced molecular science. We have started to construct the newendstation at the undulator-based soft X-ray beamline BL6U since 2020. The new instrumentation of thephotoelectron momentum microscope is developing and you may see the final whole picture of the apparatus inFY2022, which consists of a double-hemispherical analyzer with spin detector. In the beamline BL1U, we haveconducted in developing the novel light sources, including pulsed-γ ray and their use for the measurements.
To optimize the high-power laser light to UVSOR-III for versatile use, we arranged the endstation layout ofBL1U. In FY2022, we will test the new orbit trajectory for doing the γ-ray experiments daily to avoid affecting
other beamlines. The advanced SR-related instrument will offer opportunities in characterizing the electronic
structure of surface atomic sites, thin films, molecular adsorbates, bulk crystals, and so on.
We have discussed the possibility to construct the post-UVSOR-III as a long-term plan for sustainable
development since 2019. We look forward to receiving your feedback and suggestions on the continuing
evolution of the UVSOR Synchrotron Facility. And we hope many users will perform excellent work by fully
utilizing the UVSOR-III Synchrotron as a unique international hub for the SR research in advanced molecularscience.

April 2022
Satoshi Kera
Director of the UVSOR Synchrotron Facility