P370 – PGM I08-SXM DLS
Application
Plane grating monochromator (PGM) for soft X-ray synchrotron radiation
Year of delivery
2013
Installation site
Beamline I08-SXM at Diamond Light Source, Didcot, United Kingdom
Design Features
- High-resolution grazing incidence plane grating monochromator (PGM).
- Spectral range: 250 – 4200 eV.
- Optical elements: one plane mirror and four plane gratings.
- Temperature sensors at internal mechanics, mirror and gratings holders.
- Active water cooling of all optical elements.
-
Water cooled zero-order stop.
- Mechanically decoupled internal mechanics from the vacuum chamber.
- Internal mechanics directly connected to the adjustable support structure underneath.
- Adjustable support structure.
- Permanently installed bakeout provisions.
Performance Features
- Very high step resolution.
- Very high pitch rotation stability and repeatability.
- Minimized mounting induced deformations.
Outer Dimensions
Technical specifications and performance values
General
Vacuum chamber
Chamber type
cylindrical, vertical axis
Main flanges
at the top
Material
1.4404 (C < 0.02%)
Base pressure
10-10 mbar range
Optical design parameters
Beam height (entrance)
1400 mm
Beam offset
10 mm
Number of plane mirrors
1
Plane mirror dimensions
450 mm x 40 mm x 50 mm
Number of gratings
4
Gratings dimensions
150 mm x 40 mm x 40 mm
Support structure
Adjustment ranges
Vertical translation
± 15 mm
Trasversal translation
± 15 mm
Longitudinal translation
± 15 mm
Pitch
± 1°
Roll
± 1°
Yaw
± 1°
Plane mirror
Pitch rotation
Range
0.66° to -11.55°
Resolution (design value)
0.0036 µrad /motor fine step
(1/64, recommended)
0.0047961 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.11 µrad (pitch)
Translation
Range
55.20 mm
Resolution (design value)
0.0586 µm /motor fine step
(1/256, recommended)
0.05 µm /encoder count
Repeatability
0.09 µrad (pitch)
Gratings
Pitch rotation
Range
0.63° to -11.76°
Resolution (design value)
0.0036 µrad /motor fine step
(1/64, recommended)
0.0047961 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.12 µrad (pitch)
Long-term stability (> 1h)
0.023 µrad
Translation
Range
190.80 mm
Resolution (design value)
0.039 µm /motor fine step
(1/64, recommended)
0.05 µm /encoder count
Repeatability
0.22 µrad (pitch)
Performance Test Results
Pitch deviation after pitch change (mirror)
Pitch deviation after pitch change (grating)
Pitch deviation after mirror translation
Pitch deviation after grating translation
Mirror pitch positioning resolution
Grating pitch positioning resolution
Mirror pitch positioning resolution
Grating pitch positioning resolution
Pitch positioning stability vs inlet water pressure
Pitch positioning stability vs cooling water flow rate
Grating pitch long-term stability
