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P438 – Mirror Unit SIX NSLS-II
Application
Mirror unit (M4) for soft X-ray synchrotron radiation
Year of delivery
2016
Installation site
SIX beamline at the synchrotron radiation source NSLS-II, USA
This soft X-ray deflecting mirror unit is part of the SIX beamline, dedicated to high resolution soft X-ray scattering experiments. Energy resolution and pointing stability are here of crucial importance. It features an adapted constant-strut-length mechanism accounting for space constraints due to the proximity to the experimental station of the resonant innelastic X-ray scattering spectrometer (RIXS).
Design Features
-
Constant-strut-length hexapod mechanism.
- Six degrees of freedom and selectable rotation center.
- Spectral range: 150 – 2000 eV.
- Optical elements: one focusing mirror.
- Electrode at mirror surface.
- Temperature sensors at mirror holder and chin guard.
-
Four motorized and electrically isolated OFHC baffle blades at the entrance flange.
- Permanently installed bakeout provisions.
- Adjustable support structure.
Performance Features
- High positioning resolution (minimum incremental motion).
- High stability and repeatability for all degrees of freedom.
- 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
1419.25 mm
Number of mirrors
1
Surface shape
ellipsoidal
Mirror dimensions
280 mm x 45 mm x 50 mm
Actuator drives for hexapod axes
Resolution (design value)
0.003 µm /motor fine step
(1/32, recommended)
0.005 µm /encoder count
Mirror mechanics
Pitch rotation
Range
± 5 mrad
Resolution (measured value)
0.05 µrad
Repeatability
0.14 µrad (pitch)
0.16 µrad (roll)
Long-term stability (> 3o minutes)
0.13 µrad
Roll rotation
Range
± 35 mrad
Resolution (measured value)
0.25 µrad
Repeatability
0.30 µrad (pitch)
0.20 µrad (roll)
Lang-term stability (> 30 minutes)
0.08 µrad
Yaw rotation
Range
± 10 mrad
Long-term stability (> 30 minutes)
0.09 µrad
Lateral translation
Range
± 5 mm
Repeatability
0.32 µrad (pitch)
0.33 µrad (roll)
Long-term stability (> 30 minutes)
0.002 µm
Longitudinal translation
Range
± 5 mm
Long-term stability (> 30 minutes)
0.008 µm
Vertical translation
Range
± 5 mm
Long-term stability (> 30 minutes)
0.007 µm
Baffle slits
Material
OFHC
Range
± 15 mm
Resolution (design value)
0.10 µm /motor step
(full step at actuator)
0.05 µm /encoder count