P468 – PGM IPE LNLS
Application
Plane grating monochromator (PGM) for soft X-ray synchrotron radiation
Year of delivery
2019
Installation site
IPE beamline at Sirius Synchrotron Light Source, LNLS Brazil
Design Features
- High-resolution grazing incidence variable line spacing plane grating monochromator (PGM).
- Spectral range: 90 – 2000 eV.
- Optical elements: one plane mirror and four plane grating.
- Temperature sensors at internal mechanics, mirror and gratings holders.
-
Active water cooling of all optical elements.
- Water cooled zero-order stop.
- Permanently installed bakeout provisions.
- Adjustable support structure.
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 flange
at the top
Material
1.4404 (C < 0.02%)
Base pressure
10-10 mbar range
Optical design parameters
Beam height (entrance)
1390 mm
Beam offset
18 mm
Number of plane mirrors
1
Plane mirror dimensions
530 mm x 40 mm x 50 mm
Number of gratings
4
Gratings dimensions
160 mm x 50 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
-0.5° to +11°
Resolution (design value)
0.004 µrad /motor fine step
(1/64, recommended)
0.0097087 µrad /encoder count
Repeatability
0.14 µrad (pitch)
0.15 µrad (roll)
Long-term stability (2.5 h)
0.015 µrad
Translation
Range
-10 mm to +27 mm
Resolution (design value)
0.02 µm /motor fine step
(1/128, recommended)
0.05 µm /encoder count
Repeatability
0.16 µrad (pitch)
0.15 µrad (roll)
Gratings
Pitch rotation
Range
-0.9° to +9.4°
Resolution (design value)
0.004 µrad /motor fine step
(1/64, recommended)
0.0097087 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.12 µrad (pitch)
0.07 µrad (roll)
Long-term stability
(ca. 30 minutes)
0.011 µrad
Translation (grating exchange)
Range
190 mm
Resolution (design value)
0.02 µm /motor fine step
(1/128, recommended)
0.05 µm /encoder count
Repeatability
0.17 µrad (pitch)
0.15 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
Grating pitch positioning resolution
Mirror pitch long-term stability
Grating pitch long-term stability
Scanning speed of mirror pitch
Scanning speed of grating pitch
Residual gas analysis
