![P389 - Monochromator - Bestec GmbH_02 P389 - Plane grating monochromator (PGM) for soft X-ray synchrotron radiation at SiP ME2 beamline at synchrotron radiation source SSRF, China - Bestec GmbH](https://bestec-optics.com/wp-content/uploads/2015/06/P389-Monochromator-Bestec-GmbH_02-768x1024.png)
P389 – VLS-PGM SiP ME2 SSRF
Application
Plane grating monochromator (PGM) for soft X-ray synchrotron radiation
Year of delivery
2015
Installation site
SiP ME2 beamline at synchrotron radiation source SSRF, China
Design Features
-
High-resolution grazing incidence variable line spacing plane grating monochromator (VLS-PGM).
- Spectral range: 40 – 2000 eV.
- Optical elements: one plane mirror and three VLS plane gratings.
- Temperature sensors at the internal mechanics.
-
Active water cooling of all optical elements.
-
Motion control system with EPICS interface.
- 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 flanges
at the top
Material
1.4404 (C < 0.02%)
Base pressure
10-10 mbar range
Optical design parameters
Beam height (entrance)
1300 mm
Beam offset
21 mm
Number of plane mirrors
1
Plane mirror dimensions
410 mm x 50 mm x 60 mm
Number of gratings
3
Gratings dimensions
180 mm x 40 mm x 50 mm
Support structure
Adjustment ranges
Vertical translation
± 15 mm
Lateral translation
± 15 mm
Longitudinal translation
± 15 mm
Pitch
± 1.5 °
Roll
± 1.5°
Yaw
± 1.5°
Plane mirror
Pitch rotation
Range
+1° to -12.5°
Resolution (design value)
0.00375 µrad /motor fine step
(1/64, recommended)
0.0097087 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.20 µrad (pitch)
0.35 µrad (roll)
Long-term stability (> 45 minutes)
0.03 µrad
Scanning speed
~720 µrad /s
Gratings
Pitch rotation
Range
-1° to -12.5°
Resolution (design value)
0.00375 µrad /motor fine step
(1/64, recommended)
0.0097087 µrad /encoder count
Resolution (measured value)
0.05 µrad
Repeatability
0.24 µrad (pitch)
0.29 µrad (roll)
Long-term stability (> 45 minutes)
0.02 µrad
Scanning speed
~700 µrad /s
Translation
Range
-43.8 mm to +154.2 mm
Resolution (design value)
0.04 µm /motor fine step
(1/128, recommended)
0.05 µm /encoder count
Repeatability
0.24 µrad (pitch)
2.40 µrad (roll)