Optical Hutch - major optical elements

The BM16 optical configuration is made up of 3 major elements

1. Mirror 1 - A Rd coated flat mirror, which helps to cope with the heat load by filtering out energies higher than 17 keV and also vertically collimates the beam.
2. Monochromator - A Si111 double-crystal monochromator, which selects the specific energy required for your experiment.
3. Mirror 2 - A Rd coated toroidal mirror, which focuses the monochromatic beam horizontally and vertically at the sample position.

Mirror 1

Main characteristics:
 
• Flat, 1.2 m long, bent R=12 km
• 3.6 mrad incidence angle
• 0.4 nm rms roughness
• 2 mrad rms slope error
• Main function Vertical Beam Collimation

Mirror 2

Main characteristics:
 
• 3.6 mrad incidence angle
• Cylindrical, bent R<22 km!
• 0.2 nm roughness
• 2.5*10-6 rad slope error
• Main function Focuses horizontally and vertically at the sample position

Monochromator

Main characteristics:
 
• 2 Crystals
• Si(111), 140 x 80 x 20 mm
• Selects Energy with a theoretical resolution dE/E of 10-4
• Positioned by 7 motors