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
Performance Test Results
Pitch deviation after pitch change (mirror)
Roll deviation after pitch change (mirror)
Pitch deviation after pitch change (grating)
Roll deviation after pitch change (grating)
Pitch deviation after mirror translation
Roll deviation after mirror translation
Pitch deviation after grating translation
Roll deviation after grating translation
Mirror pitch positioning resolution
Mirror pitch step width
Grating pitch positioning resolution
Grating pitch step width
Mirror pitch long-term stability
Grating pitch long-term stability
Mirror lateral position long-term stability
Grating lateral position long-term stability
Grating pitch long-term stability
with cooling water
Grating pitch positioning resolution
with cooling water
Residual gas analysis
