About us

Outline of the Facility

Outline

 The Hiroshima synchrotron radiation center is the only one synchrotron radiation facility attached to a national university in Japan. It was established in 1996, as part of the academic policies of the Japanese government. A compact 700 MeV electron-storage ring, called HiSOR (this whole center is often referred to as HiSOR), produces synchrotron radiation in the ultraviolet and soft x-ray range. The photon energy range is suitable to study electronic states (energy-band dispersion, Fermi surface, spin polarization, and many-body interactions) in solids. As described below, circular dichroism in the vacuum ultraviolet region is very useful for the structural study of biomolecules in solution. The mission of the center is, therefore, to promote advanced research in the field of condensed matter physics using synchrotron radiation in the ultraviolet and soft x-ray range, as well as to develop human resources.

 Since 2010, the center has been authorized as a “Joint Usage / Research Center” by the Ministry of Education, Culture, Sports, Science and Technology (MEXT). As a result of extensive research activities in collaboration with researchers from inside and outside of Japan, the center was graded “A” in the term-end evaluation in 2015 by the MEXT. In 2016, the authorization as the Joint Usage / Research Center was extended for the next 6 years.

 We call for proposals twice a year (Period A: April – October, Period B: November – March) to timely meet beamtime requests. At the same time, we reserve part of the available beamtime for urgent proposals of high scientific impact. During the fiscal year 2016, 240 researchers (actual number) including undergraduate and graduate students conducted 120 proposals. In the period of 2004-2016, we have collaborated with researchers from 64 institutions in Japan, and 56 institutions abroad. About 20% of the researchers were from abroad, providing domestic students with an international atmosphere in the center.

Storage ring and beamlines

 The accelerator system at the center consists of a 150 MeV injector microtron, a beam transport line, and a racetrack-type 700 MeV electron-storage ring (HiSOR). The circumference of HiSOR is 22 m, and the bending radius is 0.87 m in the normal conducting 2.7 T bending magnet, giving the critical photon energy of 873 eV (1.42 nm). There are 16 beam ports; 2 for undulator beamlines, 14 for bending magnet beamlines. We have constructed 15 beamlines in total including 2 beam monitoring beamlines. On the two straight sections of HiSOR, we have installed a linear undulator and a variably polarizing undulator (APPLE-II type undulator). We provide about 1,500 hours for user beamtime, every year.

Research Projects

 In the mid-term plan (2016-2021), we focus on the following priority research areas.

  1. Study of quasiparticles by ultrahigh resolution photoemission spectroscopy
  2. Study of spin structures by spin- and angle-resolved photoemission spectroscopy
  3. Structural analysis of biomolecules in solution by VUV-CD
  4. In situ fabrication and characterization of magnetic nanostructure by SXMCD
  5. R&D for a compact low-emittance light source

 On the linear undulator beamline BL-1 (photon energy range: hν=22-300 eV), we have installed a unique rotatable angle-resolved photoemission spectroscopy (ARPES) system to investigate the symmetry of wave functions in solids, and fine electronic structures derived from the electron-phonon interaction near the Fermi level. On the variably polarizing undulator beamline, we have constructed two branch beamlines BL-9A (hν=5-35 eV) equipped with an ultrahigh resolution ARPES system and BL-9B (hν=16-300 eV) equipped with highly efficient spin- and angle-resolved photoemission spectroscopy (SARPES) system. On BL-9A, there have been many studies on the fine details of the electronic states on the meV energy scales in high-Tc cuprates or strongly correlated materials. On BL-9B, with high momentum and energy resolutions with variable photon energy, one can examine three-dimensional spin texture of magnetic materials, as well as spin texture induced by the strong spin-orbit interaction in topological system. BL-9B attracts many proposals and more than half of the beamtime is used by collaborators outside of Japan.

 On the beamline BL-12 (hν=2-10 eV), we have installed a vacuum ultraviolet circular dichroism (VUV-CD) beamline for the structural analysis of biomolecules (proteins, sugars, and nucleic acids) in solution. This experimental technique is developed at this center, and has been recognized as a powerful tool to clarify structures of a wide range of samples under different solvent/environmental conditions.

 On the beamline BL-14 (hν=400-1200 eV), one can prepare atomically controlled thin films or nanostructures on substrates in situ, and characterize their magnetic and electronic properties by measuring the soft X-ray magnetic circular dichroism (SXMCD) measurements.

 We are also developing a design for a compact low-emittance electron storage ring called HiSOR II as a part of the future plan for our center.

Human resource development and outreach

 Being a part of the graduate school of science, Hiroshima University, the center is involved with fostering human resources not only through lectures and seminars, but also through research activities using synchrotron radiation. Undergraduate and graduate students can participate in domestic or international collaborative research, and directly learn about the latest research activities in the field.

 Furthermore, the center hosts the Hiroshima International Symposium on Synchrotron Radiation (HiSOR symposium) every year since its inauguration. In the 21st HiSOR symposium held on Mar. 2-3, 2017, there were 13 oral presentations and 43 poster presentations, and 100 participants. Distinguished researchers in our priority research areas were invited and gave lectures. Students presented their scientific achievements in the poster session. In a flash poster session of the symposium, all the students can give a short presentation to advertise their poster in English. To encourage students, we present the best student poster awards for their outstanding scientific research and excellent poster presentation.

 We accept many visitors including junior and senior high school students and international students. In 2016, a total of 1,131 people visited our center.

History

1983 Preparatory committee formed
1984 Preparatory room opened
1996 Inauguration of HiSOR (ministerial facility) (May)
Interdepartment shared educational research facility
2 professors, 2 associate professors, and 2 research associates
1999 Constructed the Okayama University Beamline
2001 Hosted the Joint Symposium on the Annual Meeting of the Japanese Society for Synchrotron Radiation Research, and the 4th Asian Forum on Synchrotron Radiation (January)
2002 Reopened as a national shared-use facility
Joined the National University National Shared-use Laboratory and Research Center Council
Joined the National University Laboratory Center Director Council
2003 Hosted the International Symposium on Synchrotron Radiation Research for Spin and Electronic States in d and f Electron Systems (November)
2004 Collaborative research with SPring-8 on hard x-ray photoemission spectroscopy
2005 Special educational research fund (core formation fund) "National Development of Synchrotron Radiation Nano Science" (2005-2009)
2006 10 year anniversary ceremony (May)
Began collaborative research with Mazda and Hamamatsu Photonics K.K.
2007 Hosted the Joined Symposium of the Annual Meeting of the Japanese Society for Synchrotron Radiation Research and HiSOR (January)
International Review (Chair: Professor Toshiaki Ohta)
2010 Authorized as a “Joint Usage / Research Center” by the MEXT (Period: 2010-2015)
2012 International Review (Chair: Professor Ingolf Lindau)
2014 Hosted the Joined Symposium of the Annual Meeting of the Japanese Society for Synchrotron Radiation Research and HiSOR (January)
2015 Graded “A” in the term-end evaluation by the MEXT
2016 Renewal of authorization as the “Joint Usage / Research Center” (Period: 2016-2021)
20 year anniversary ceremony (March)
2017 Hosted International workshop on strong correlations and angle-resolved photoemission spectroscopy (July)