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BL-28A/B : Variable Polarization VUV and Soft X-ray Spectroscopy

What's new.

  • 2026/10/26：NEW! BL-28A: The MCP assembly unit for the photoelectron energy analyzer, DA30, has been updated as of Term II, 2026. This version does not have a mesh in front of the MCP; consequently, no mesh pattern appears in the data, even when measurements are taken in the "fix mode".

Overview

Beamline group 　Subcommittee 1 (Photoelectron spectroscopy)
Technique
  • Angle-resolved photoelectron spectroscopy (ARPES)
  • Microspectroscopy
  • VUV spectroscopy
Features
  • Photon energies between 30 and 300 eV are available.
  • Vertical and horizontal linear polarized and left and right circular polarized lights are available.
  • High-resolution ARPES measurements using micro-focused beams, at low temperatures down to 10 K, are possible at Branch A.
  • Branch B is a free port, at which a bring-your-own measurement equipment can be installed.
Area of research
  • Condensed matter physics
  • Surface physics
Contacts
  • Kenichi Ozawa kenichi.ozawa(at)kek.jp
    • Please change (at) to @ in the e-mail address.
Notes
  • The type of the sample holders used at the ARPES system at Branch A is an Omicron type, which is also employed at the PES system at BL-13B.

Performance

Source
  • PF 2.5-GeV Ring, Elliptically-polarizing undulator with six variable rows of magnetic arrays
Optics
  • Variable-included-angle Monk-Gillieson-type monochromator with varied-line-spacing gratings (VLSGs)
  • Focusing mirror of Branch A: Kirkpatrick-Baez (K-B) mirror
  • Focusing mirror of Branch B: Toroidal mirror
Energy range
  • 30 – 300 eV
    Vertical and horizontal linear polarized lights
    Left and right circular polarized lights
Resolution
  • E/ΔE > 20000 at 65 eV
Beam size
  • Branch A：12 (V) × 10 (H) µm at 200 eV
  • Branch B：40 (V) × 100 (H) µm at 100 eV
Photon flux
  • 1011 - 1012 photons/s
Instruments
  • Branch A：Micro-ARPES system with an iGONIO manipulator (10 - 300 K)
Detectors
  • Omicron-Scienta DA30 analyzer
Remote / Mail-in
  • Remote measurements are possible, but the sample transfer should be done manually.
Special notes

References

  1. K. Tsuchiya et al., AIP Conf. Proc., 1741, 020023 (2016), doi:10.1063/1.4952802 : [Elliptically-polarizing undulator with six variable rows of magnetic arrays]
  2. M. Kitamura et al., Rev. Sci. Instrum., 93, 033906 (2022), doi:10.1063/5.0074393 : [Micro-focusing of the beam by the K-B mirror]
  3. M. Kitamura et al., J. Phys.: Conf. Ser., 3010, 012149 (2025), doi:10.1088/1742-6596/3010/1/012149 : [UHV sample transfer vessel]

Publications

KEK-PF Publication Database (Publications of BL-28A/B)

Last updated: 2026-10-26

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