P469 – Soft XRD SCS European XFEL
Application
Soft X-ray diffractometer / Experimental station for RIXS spectrometer
Year of delivery
2020
Installation site
SCS instrument of the European XFEL, Germany
This soft X-ray diffractometer also serves as a low-temperature sample station for the hRIXS spectrometer at the SCS beamline at the European XFEL. A triple rotating flange system is integrated into the vacuum chamber allowing for variation of the angle of the scattered radiation from the sample, which is analyzed in the hRIXS. Alignment and sample transfer can be controlled remotely, considering access and space constrains at the installation site.
Design Features
- Sample manipulator with six degrees of freedom including Theta circle.
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Sample cooling (liquid He, 20 K).
- Detector manipulator, 2Theta circle.
- Provisions for incoupling of THz radiation.
-
Triple rotation flange for variation of scattering angle without breaking the vacuum.
- Motorized and encoded support structure for remote alignment.
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Automated system for sample transfer between load-lock, sample garage and sample manipulator.
Performance Features
- High stability for small effective RIXS source size.
- High positioning repeatability of the complete system after experiment exchange at the beamline.
- Small circle of minimum confusion of all sample and detector manipulator rotation axes.
- High positioning resolution and repeatability of all motion axes.
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Low sample temperature (20 K) at large beam incidence and scattering angle ranges (no cooling shield around sample).
Outer Dimensions
Technical specifications and performance values
General
Vacuum chamber
Chamber type
cylindrical, horizontal axis
Main flanges
cluster flange at the entrance flange
triple rotation flange at the exit flange
Material
1.4404 (C<0.02%)
Base pressure
2.9 x 10-9 mbar
Vacuum chamber
Chamber lateral translation
Range
-13.63 mm to 13.97 mm
Resolution (design value)
0.025 µm /motor fine step
(1/16, recommended)
0.05 µm /encoder count
Repeatability
< 10 µm
Chamber longitudinal translation
Range
-10.60 mm to 11.03 mm
Resolution (design value)
0.025 µm /motor fine step
(1/16, recommended)
0.05 µm /encoder count
Internal mechanics vertical translation
Range
-7.71 mm to 10.20 mm
(wedge leveler 1)
-7.70 mm to 10.20 mm
(wedge leveler 2)
Resolution (design value)
0.40 µm /motor step (at actuator)
0.08 µm /motor step
(at wedge leveler)
0.05 µm /encoder count
Triple rotation flange
Triple rotation flange 1
Range
-82.2° to 55.9°
Resolution (design value)
6.4 x 10-4 °/motor step
8.3 x 10-6 °/encoder count
Triple rotation flange 2
Range
-116.5° mm to 165.2° mm
Resolution (design value)
6.4 x 10-4 °/motor step
8.3 x 10-6 °/encoder count
Triple rotation flange 3
Range
-71.1° to 48.60°
Resolution (design value)
7.89 x 10-4 °/motor step
8.38 x 10-4 °/encoder count
Sample manipulator
Sample lateral translation
(along sample surface)
Range
-6.93 mm to mm +6.12 mm
Resolution (design value)
0.0048 µm /motor fine step
(1/512, recommended)
0.005 µm /encoder count
Sample longitudinal translation
Range
-11.58 mm to -0.76 mm
Resolution (design value)
0.0048 µm /motor fine step
(1/64, recommended)
0.005 µm /encoder count
Sample vertical translation
Range
-5.64 mm to mm +6.00 mm
Resolution (design value)
0.048 µm /motor fine step
(1/512, recommended)
0.05 µm /encoder count
Sample rotation (Kappa)
Range
-30.7° to +30.6°
Resolution (design value)
1.34 x 10-5 °/motor fine step
(1/512, recommended)
3.37 x 10-6 °/encoder count
Repeatability
0.56 µrad
Circle of confusion
6.15 µm
Sample rotation (Theta)
Range
-182.26° to +192.69°
Resolution (design value)
9.44 x 10-5 °/motor fine step
(1/512, recommended)
8.38 x 10-8 °/encoder count
Repeatability
0.53 µrad
Circle of confusion
2.7 µm
Sample rotation (Azimuth)
Range
± 90°
Resolution (design value)
2.81 x 10-3 °/motor fine step
(1/256, recommended)
1.27 x 10-4 °/encoder count
Repeatability
0.0012° (21 µrad)
Detector manipulator
Detector rotation (2Theta)
Range
± 180.4°
Resolution (design value)
8.37 x 10-5 °/motor fine step
(1/512, recommended)
8.38 x 10-8 °/encoder count
Repeatability
0.83 µrad
Circle of confusion
10.4 µm
Performance Test Results
Sample position deviation after lateral
translation
Sample position deviation after longitudinal translation
Sample position deviation after vertical translation
Sample rotation deviation after rotation (Kappa)
Sample rotation deviation after rotation (Theta)
Sample rotation deviation after rotation (Azimuth)
Circle of confusion for sample rotation (Theta)
Circle of confusion for detector rotation (2Theta)
Detector rotation deviation after rotation (2Theta)
Residual gas analysis
Triple rotation flange longitudinal deviation
Triple rotation flange vertical deviation
Pictures
Videos
