P447 – Beam Shaping Slits I14 DLS
Application
Beam shaping slits for hard X-ray synchrotron radiation
Year of delivery
2016
Installation site
Beamline I14 at Diamond Light Source, Didcot, United Kingdom
Design Features
-
Double slit mechanism – vertically and horizontally defining slits.
-
Motorized and encoded slits opening, symmetric opening, non-linear opening characteristics.
- Tungsten slit blades.
- Electrical isolation of all slit blades.
- Isolated bias plate.
- Adjustable support structure.
Performance Features
- Precision and slit opening repeatability smaller than 100 nm.
- Parallelism smaller than 1 µm over 10 mm edge length.
- Straightness smaller than 0.3 µm over 10 mm edgle length.
- Very small deviation (submicrometer) of the slit opening calibration curve from the theoretical non-linear slit opening function.
Outer Dimensions
Technical specifications and performance values
General
Vacuum chamber
Chamber type
cylindrical, horizontal axis
Main flanges
DN160CF cluster flanges
Material
1.4301
Base pressure
10-10 mbar range
Horizontally defining slit (HDS)
Slit blades
Material
Tungsten
Straightness
< 0.25 µm over 10 mm (1σ)
Parallelism
-0.09 µm /mm
(15 µm slit opening)
-0.004 µm /mm
(95 µm slit opening)
Slit opening
Range
5 µm to 8.5 mm
Repeatability
± 0.04 µm
(up to 435 µm slit opening)
Resolution (design value)
0.006 µm /motor fine step
(1/16, recommended)
0.05 µm /encoder count
Vertically defining slit (VDS)
Slit blades
Material
Tungsten
Straightness
< 0.15 µm over 10 mm (1σ)
Parallelism
0.02 µm /mm
(15 µm slit opening)
-0.008 µm /mm
(95 µm slit opening)
Slit opening
Range
5 µm to 10 mm
Repeatability
± 0.038 µm
(up to 350 µm slit opening)
Resolution (design value)
0.006 µm /motor fine step
(1/16, recommended)
0.05 µm /encoder count
Performance Test Results
Slit width calibration (HDS)
Slit opening repeatability (HDS)
Slit blades parallelism (HDS)
Slit blades parallelism (HDS)
Slit width calibration (VDS)
Slit opening repeatability (VDS)
Slit blades parallelism (VDS)
Slit blades parallelism (VDS)
Residual gas analysis
