Please note: these are the design specifications. Potential users should contact the I15 beamline team to discuss current capabilities.
- Cryo-cooled double crystal monochromator
- Kirkpatrick-Baez Mirrors (vertical and horizontal focusing)
- Micro-focusing mirrors (later stage)
DCM - Double Crystal Monochromator
Key Parameters
| energy range (keV) | 20.0 - 80.0 |
| crystal type | Si(111) |
| crystal dimensions (mm3) 1st crystal (length x width x height) 2nd crystal (length x width x height) |
172 x 50 x 70 170 x 20 x 50 |
| beam offset distance (mm) | 20.0 |
| distance from source (m) | 25.6 |
| cooling | liquid nitrogen |
| on axis power loading before filter (kW/mrad2) at 300mA | 23.1 |
Large Kirkpatrick-Baez mirror system
VFM - vertical focussing mirror, HFM - horizontal focussing mirror
The mirrors act for vertical and horizontal focusing and for rejection of high photon energies. They operate in white and monochromatic beam. The different coatings of the HFM provide a set of cut-off energies at constant reflection angle.
Key parameters
| mirror length (mm) | 1350 |
| active optic length (mm) | 1150 |
| slope error (µrad) | 1.0 |
| roughness (Å) active area | <3 |
| coating VFM HFM: 3 stripes |
20mm Pt 13 mm Ni, 13 mm Pt, 14 mm Si |
| distance from source (m) VFM HFM |
29.7 39.9 |
Small Kirkpatrick-Baez mirror system
Purpose of the secondary, micro-focusing mirrors is to provide a focal spot size of the order of 10 µm (FWHM) in monochromatic beam.
Key parameters
| mirror length (mm) | 300 |
| active optic area (length x width in mm) | 280 x 20 |
| slope error (µrad) | |
| roughness (Å) active area | |
| coating | Pt |
| distance from source (m) |
|