P495 – FURKA RIXS Spectrometer ATHOS SwissFEL PSI
Application
Resonant inelastic X-ray scattering (RIXS) spectrometer
Year of delivery
2022
Installation site
ATHOS beamline at Swiss FEL, Paul Scherrer Institut, Switzerland
The design of the FURKA RIXS for the SwissFEL is similar to the hRIXS for the European XFEL (see P470) and benefited from the prior development of the hRIXS. The challenge here was to realize the required variable incidence angle on the detector, which is rigidly connected to the detector chamber, without blocking part of the beam and the detector.
For detailed information on the RIXS spherical grating monochromator and its performance, see P495-SGM.
Design Features
- Spectral range: 200 – 2000 eV.
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Variable included angle monochromator design.
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Variable detector incidence angles for all grating included angles.
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Variable entrance and exit arm lengths.
Performance Features
- Very high pitch angle resolution over the whole range.
- Low parasitic motions for all resolution relevant axes.
- Very high vibrational and drift stability.
Outer Dimensions
Technical specifications and performance values
General
Spectrometer rotation
Range
43° to 145°
Resolution (design value)
2.9 x 10-4 °/motor step
3.31 x 10-6 °/encoder count
Grating chamber
Longitudinal translation
Range
1049 mm to 2267.9 mm
Resolution (design value)
0.0468 µm /motor fine step
(1/32, recommended)
0.05 µm /encoder count
Resolution (measured value)
10 µm
Absolute accuracy (under vacuum)
19 µm
Long-term stability (3h)
0.03 µm
Detector chamber
Pitch rotation
Range
18° to 61°
Resolution (design value)
0.0125 µrad /motor fine step
(1/128, recommended)
0.33 µrad /encoder count
Absolute accuracy
0.03°
Long-term stability (> 4h)
0.11 µrad
Longitudinal translation
Range
3999.5 mm to 5900.8 mm
Resolution (design value)
0.0468 µm /motor fine step
(1/32, recommended)
0.05 µm /encoder count
Resolution (measured value)
100 mm
Absolute accuracy (under vacuum)
38 µm
Long-term stability (3h)
0.057 µm
Vertical translation
Range
-2 mm to 960 mm
Resolution (design value)
0.078 µm /motor fine step
(1/64, recommended)
0.05 µm /encoder count
Resolution (measured value)
100 mm
Absolute accuracy
14 µm (in air)
23 µm (under vacuum)
Long-term stability (3 h)
< 0.07 µm
Performance Test Results
Grating chamber longitudinal position
(laser tracker measurement)
Grating chamber absolute longitudinal
position accuracy
Grating chamber longitudinal positioning resolution
(dial gauge measurement)
Grating chamber longitudinal translation
step width
Grating chamber longitudinal position
long-term stability
Detector absolute lateral position accuracy
(laser tracker measurement)
Detector absolute vertical position accuracy
(laser tracker measurement)
Detector absolute longitudinal position accuracy
(laser tracker measurement)
Detector absolute pitch rotation accuracy
(laser tracker measurement)
Detector chamber vertical position
(laser tracker measurement)
Detector chamber absolute vertical
position accuracy
Detector chamber vertical position
(laser tracker measurement, under vacuum)
Detector chamber absolute vertical
position accuracy (chamber under vacuum)
Detector chamber longitudinal position
(laser tracker measurement, under vacuum)
Detector chamber absolute longitudinal
position accuracy (chamber under vacuum)
Detector chamber pitch rotation long-term stability
(chamber under vacuum )
Detector chamber longitudinal position long-term stability (chamber under vacuum)
Detector chamber vertical position long-term stability (chamber under vacuum)
Pictures
Video
