Photon Factory


BL-12A : Soft and Tender X-ray Beamline (under construction)


Beamline group Subcommittee 1 (Soft X-ray absorption spectroscopy)
  • Soft X-ray absorption spectroscopy
  • Reflectometry
  • The beamline can switch between a soft X-ray path (S) and a tender X-ray path (T), covering a wide energy range of 50 to 5000 eV.
  • The reflectometer previously eqipped at BL-11D is available.
Area of research
  • Takuji OHIGASHI takuji.ohigashi(at)
  • Please change (at) to @ in the e-mail address.
  • The beamline is under construction as a beamline that combines the functions of the former BL-11A, 11B, and 11D.
  • The call for proposals is scheduled to begin in the second half of FY2023. However, depending on the progress of construction, the timing of use is not decided yet. At first, the tender X-ray path (1700 - 5000 eV) will be available and the soft X-ray path will be opened later (hopefully in FY2024).
  • Those who have valid proposals that were conducted in the former BL-11A, 11B, and 11D can continue to conduct experiments in BL-12A.


  • 2.5GeV PF Bending magnet (B12)
  • Soft X-ray path : Variable line spacing plane grating monochromator
  • Tender X-ray path : Double crystal monochromator [Si(111) or InSb(111)]

Conceptual diagram of optics of BL-12A (Side view)
Energy range
  • Soft X-ray path : (50) 70 - 2000 eV
    (Below 70 eV, only available with defocus) [hopefully available from FY2024]
  • Tender X-ray path : 1700 - 5000 eV
Resolution (ΔE/E)
  • Soft X-ray path : > 2000 (theoretically)
  • Tender X-ray path : ~5000 [Si(111)], 1600 [InSb(111)] (theoretically)
Beam size
  • Soft X-ray path : ~0.5 (H) × 0.7 (V) mm (theoretically)
  • Tender X-ray path : ~0.5 (H) × 2.0 (V) mm (theoretically)
Photon flux
  • TEY/FY XAFS chamber
  • A reflectometer
    The incidence angle varies between 5 and 89 degrees. The angular resolution < 0.1° in reflectivity measurements is available. A sample of φ200 mm can be mounted on the sample stage. It is also possible to place multiple small samples on the stage. The ultimate vacuum of the reflectometer chamber is 1 × 10-5 Pa.

  • SDD for FY XAFS chamber
Remote / Mail-in
  • not available
Special notes
  • Schecule depends on the construction process.



Last updated: 2023-4-12