Precision Slit Unit
Precision slit units open symmetrically and feature exceptional blade parallelism and straightness at a wide opening range. They are designed and built using well-proven modules and principles combining ultra-high precision and repeatability with a robust design for reliable operation. Each unit is custom-tailored according to the requirements at the specific installation site.
Mechanism
The nonlinear characteristic of the symmetrically opening slit mechanism allows for setting small slit openings with highest accuracy, whereas bigger openings are set very fast.
Options
- Double slit mechanism.
- Longitudinal travel of the unit along beam direction.
- Transversal slit translation.
- Tunable slit orientation (rotation around beam axis).
- Slit blade materials: OFHC, W, Mo, B4C, Au coating.
- Blade cooling.
- Ellectrically isolation of blades.
- Motion control system.
Performance parameters
Performance parameter values for individual projects may well exceed the values listed below.
Slit blades
Edge straightness
< 0.1 µm /mm (OFHC)
Parallelism
< 0.1 µm /mm
Slit opening
Range
0 – 10 mm
Repeatability
< 0.1 µm
Slit rotation
Range
± 1°
Spurious slit opening
< ± 0.5 µm
Transversal translation
Range
± 5 mm
Spurious slit opening
< ± 0.2 µm
Longitudinal translation
Range
< 1000 mm
Resolution
0.05 µm
Performance Test Results
Slit width calibration
Slit opening repeatability
Slit blades parallelism
Slit blades straightness
Application
Slit units are essential components of monochromator beamlines at synchrotron radiation sources. They serve as wavelength selector for the energy-dispersed radiation and as beam shapers for intermediate foci.
