P480 – PGM NSRL USTC
Application
Plane grating monochromator (PGM) for soft X-ray synchrotron radiation
Year of delivery
2020
Installation site
National Synchrotron Radiation Laboratory, University of Science and Technology, China
Design Features
- Plane grating monochromator (PGM).
- Spectral range: 200 – 1500 eV.
- Optical elements: one plane mirror and two plane gratings.
- Temperature sensors at internal mechanics, mirror and gratings holders.
-
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
20 mm
Number of plane mirrors
1
Plane mirror dimensions
400 mm x 40 mm x 50 mm
Number of gratings
2
Gratings dimensions
200 mm x 40 mm x 40 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
+0.6° to -16.52°
Resolution (design value)
0.0043 µrad /motor fine step
(1/128, recommended)
0.0097087 µrad /encoder count
Resolution (measured value)
0.10 µrad
Repeatability
0.22 µrad (pitch)
0.13 µrad (roll)
Long-term stability (> 4 h)
0.018 µrad
Translation
Range
-21 mm to +21 mm
Resolution (design value)
0.026 µm /motor fine step
(1/64, recommended)
0.05 µm /encoder count
Repeatability
0.32 µrad (pitch)
0.10 µrad (roll)
Gratings
Pitch rotation
Range
+0.6° to -16.92°
Resolution (design value)
0.0043 µrad /motor fine step
(1/128, recommended)
0.0097087 µrad /encoder count
Resolution (measured value)
0.10 µrad
Repeatability
0.13 µrad (pitch)
0.10 µrad (roll)
Long-term stability (> 7 h)
0.010 µrad
Scanning speed
1.12 mrad /s
Translation (grating exchange)
Range
-68.11 mm to +5.94
Resolution (design value)
0.026 µm /motor fine step
(1/64, recommended)
0.05 µm /encoder count
Repeatability
0.16 µrad (pitch)
0.40 µrad (roll)
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 long-term stability
Grating pitch long-term stability
Mirror pitch positioning resolution
Grating pitch positioning resolution
Scanning speed of grating pitch
Residual gas analysis
Video
