P457 – Mirror Unit VNIIOFI KSRS
Application
Mirror unit (M1) for soft X-ray synchrotron radiation
Year of delivery
2017
Installation site
VNIIOFI beamline at the synchrotron radiation source KSRS, Russia
This mirror unit for the VNIIOFI beamline at the KSRS features a Cartesian constant-strut-length hexapod mechanism to realize the required degrees of freedom. The cartesian design allows for intuitive manual mirror alignment.
Design Features
-
Cartesian constant-strut-length hexapod mechanism.
- Spectral range: 2.5 – 1200 eV.
- Optical elements: one collimating mirror.
- Manual alignment of the mirror in six degrees of freedom.
-
Active side water cooling of the mirror.
- Electrode in front of mirror surface.
- Temperature sensors at mirror holder.
- Four water cooled, motorized and electrically isolated Tungsten blades at the entrance flange.
- Temperature sensors at the aperture blades.
- Permanently installed bakeout provisions.
- Adjustable support structure.
Performance Features
- Cartesian constant-strut-length hexapod mechanism.
- Intuitive manual mirror alignment due to cartesian design.
- High step resolution (actuated manually).
- High stability for all degrees of freedom.
- Minimized mounting induced deformations.
Outer Dimensions
Technical specifications and performance values
General
Vacuum chamber
Chamber type
stadium shaped footprint
Main flanges
at the top
Material
1.4404 (C < 0.02%)
Base pressure
10-10 mbar range
Optical design parameters
Beam height
1940 mm
Number of mirrors
1
Surface shape
elliptical-toroidal
Mirror dimensions
800 x 50 x 60 mm3
Mirror mechanics
Pitch rotation (Ry) – manual
Range
± 1°
(relative to mirror default position)
Gear ratio
0.063° /turn
Average step width
3 µrad
Minimum step width
1.8 µrad
Long-term stability
(ca. 30 minutes)
< 0.01 µrad
Roll rotation (Rz) – manual
Range
± 1°
(relative to mirror default position)
Gear ratio
0.3° /turn
Average step width
17.7 µrad
Minimum step width
6 µrad
Yaw rotation (Rx) – manual
Range
± 1°
(relative to mirror default position)
Gear ratio
0.063° /turn
Mirror translation (Tx) – manual
Range
± 1 mm
(relative to mirror default position)
Gear ratio
0.5 mm /turn
Mirror translation (Ty) – manual
Range
± 1 mm
(relative to mirror default position)
Gear ratio
0.5 mm /turn
Mirror translation (Tz) – manual
Range
± 1 mm
(relative to mirror default position)
Gear ratio
0.5 mm /turn
Average step width
2 µm
Minimum step width
1 µm
Aperture unit
Blades
Material
Tungsten
Absorber material
OFHC
Range
± 25 mm
Resolution (design value)
0.006 µm /motor fine step
(1/16, recommended)
0.05 µm /encoder count
Performance Test Results
Mirror pitch positioning resolution
Mirror pitch long-term stability
Mirror roll positioning resolution
Mirror translation positioning resolution
Residual gas analysis
