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P484 – PGM ADRESS SLS PSI
Application
Plane grating monochromator (PGM) for soft X-ray synchrotron radiation
Year of delivery
2023
Installation site
ADRESS beamline at Swiss Light Source, Paul Scherrer Institute, Switzerland
Design Features
- Plane grating monochromator (PGM).
- Spectral range: 300 – 1600 eV.
- Optical elements: one plane mirror and four plane gratings.
- Temperature sensors at internal mechanics, mirror and gratings.
-
Active water cooling of all optical elements.
- Water cooled zero-order stop.
-
Motion control system with EPICS interface, EtherCAT, fast encoder readout suitable for on-the-fly measurements.
- 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
- High positioning resolution (minimum incremental motion).
- 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
17 mm
Number of plane mirrors
1
Plane mirror dimensions
360 mm x 40 mm x 50 mm
Number of gratings
4
Gratings dimensions
150 mm x 40 mm x 50 mm
Support structure
Adjustment ranges
Vertical translation
± 5 mm
Lateral translation
± 10 mm
Longitudinal translation
± 10 mm
Pitch
± 1°
Roll
± 1°
Yaw
± 1°
Plane mirror
Pitch rotation
Range
-0.50° to +10.27°
Resolution (design value)
0.00217 µrad /motor fine step
(1/128, recommended)
0.00146 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.13 µrad (pitch)
0.16 µrad (roll)
Long-term stability (> 1.5 h)
0.008 µrad
Translation
Range
-20.80 mm to +21.25 mm
Resolution (design value)
0.0065 µm /motor fine step
(1/128, recommended)
0.05 µm /encoder count
Repeatability
0.11 µrad (pitch)
0.13 µrad (roll)
Long-term stability (> 1.5 h)
0.002 µm
Gratings
Pitch rotation
Range
-0.66° to +11.09°
Resolution (design value)
0.00217 µrad /motor fine step
(1/128, recommended)
0.00146 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.17 µrad (pitch)
0.13 µrad (roll)
Long-term stability (> 1.5 h)
0.011 µrad
Long-term stability (1 h) with cooling water
0.013 µrad
Translation (grating exhange)
Range
-100.10 mm to +100.14 mm
Resolution (design value)
0.0065 µm /motor fine step
(1/128, recommended)
0.05 µm /encoder count
Repeatability
0.14 µrad (pitch)
0.12 µrad (roll)
Long-term stability (> 1.5 h)
0.006 µm