BL-11B Soft X-Ray Double-Crystal Monochromator Station
Spokesperson :Yoshinori KITAJIMA
5645(PHS:4279)
yoshinori.kitajima@kek.jp
BL-11B will be shut down until the end of March, 2023, because the PF has decided to construct a new R&D beamline at the area of BL-11. Present activities at BL-11B will be performed at a relocated beamline of BL-12A and other PF beamlines. BL-12A will be available after the autmun of 2023.
1. Outline
BL-11B provides soft X rays in the energy range between 1.73 keV and 5.0 keV with a double-crystal monochromator from a bending-magnet source. As there are no Be windows in the optical path, BL-11B is suitable for EXAFS measurements of light elements such as Si, P, S, and Cl.
The monochromator and its control system have been replaced since the summer of 2009.
![Layout of BL-11B](bl11b-1.gif)
Fig. 1: Optics of BL-11B.
2. Performance
Optics | Focusing Mirror/Double-Crystal Monochromator [Si(111) or InSb(111)] |
Energy Range | 2057 eV - 5000 eV [Si(111)] or 1724 eV - 3700 eV [InSb(111)] |
---|
Resolving Power | E/dE = ~5000 [Si(111)] or ~1600 [InSb(111)] |
Spot Size | ~ 5 mm (H) x 2 mm (V) |
Photon Flux | maximum ~1011 photons/s |
![Example XANES Spectrum](s2o3.png)
Fig. 2: Typical sulfur K-edge XANES spectrum for Na2S2O3 [Si(111) monochromator].
![Example EXAFS Spectrum](si.jpg)
Fig. 3: Typical silicon K-edge EXAFS spectrum for a Si wafer [InSb(111) monochromator].
![Example XANES Spectrum](batio3.png)
Fig. 3: Typical titanium K-edge XANES spectrum for BaTiO3 powder [Si(220) monochromator].
3. Equipments
- Personal computer for monochromator control [HP (WindowsXP)]
- Software for monochromator control and XAFS measurements (VisualBASIC; similar to other XAFS stations at PF)
- Photon intensity monitor system (mesh and pico-Ammeter)
- Stages for vacuum chambers (2.2 m x 1.4 m, 1.3 m x 1.0 m)
- Simple vacuum chamber for total electron/fluorescence yield XAFS measurements of bulk materials
4. Remarks
- BL-11B does not have own vacuum chambers other than a simple one stated above, so that most users should bring one. Many of experimental apparatuses of PF can be connected. Please contact the spokesperson for each apparatus.
- Sample chamber should be evacuated to < 10-5 Torr.
- Beam is ca. 1.55 m above the floor level but ca. 1.2 m from the above-mentioned stages at sample position.
6. Publications
List of publications those registered to PF publication database is available.
Last modified: April 1, 2022.