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P412 – Mirror Unit PINK EMIL BESSY
Application
Mirror unit (M2) for hard X-ray synchrotron radiation
Year of delivery
2016
Installation site
EMIL hard X-ray beamline at BESSY, Helmholtz-Zentrum Berlin, Germany
This hard X-ray switching mirror unit is part of the combined hard and soft X-ray EMIL beamlines at BESSY. It features an optimized design of the constant-strut-length hexapod mechanism used for the first Bestec hexapod (see project P377). The mirror switching is realized by a vertical movement. The vacuum chamber accomodates not only the actual beam but also the passing soft X-ray beams of the neighbouring branches.
Design Features
-
Constant-strut-length hexapod mechanism.
- Six degrees of freedom and selectable rotation center.
- Spectral range: 3 – 9.5 keV.
- Optical elements: three focusing mirrors.
-
Active side water cooling of all mirrors.
- Electrode at mirrors surfaces for carbon contamination prevention.
- Temperature sensors at mirrors chin guards.
- Four water cooled, motorized OFHC aperture 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
1400 mm / 1420 mm
Number of mirrors
3
Surface shape
cylindrical
Mirror dimensions
120 x 46(26) x 40(8) mm3
(T-Profile)
Actuator drives for hexapod axes
Resolution (design value)
0.004 µm /motor fine step
(1/128, recommended)
0.005 µm /encoder count
Mirror mechanics
Pitch rotation
Range
± 8 mrad
Resolution (measured value)
0.05 µrad
Repeatability
0.09 µrad (pitch)
0.06 µrad (roll)
Long-term stability (30 minutes)
0.05 µrad
Roll rotation
Range
± 20 mrad
Resolution
0.05 µrad
Repeatability
0.07 µrad (pitch)
0.06 µrad (roll)
Yaw rotation
Range
± 8 mrad
Resolution
0.05 µrad
Vertical translation (switch)
Range
± 60 mm
Horizotal translation
Range
± 5 mm
Aperture unit
Blades
Material
OFHC (water cooled)
Stroke
50 mm
Resolution
15 µm /motor step
(full step at actuator)
4.125 µm /motor step
(full step at blade)