Bernina Instrument

Schematic Bernina Instrument at the center SwissFEL Aramis beamline.
Schematic Bernina Instrument at the center SwissFEL Aramis beamline.

The Bernina instrument is formed by the center SwissFEL Aramis beamline, the pump laser system, and different endstations.

Besides versatile setups using the modular diffractometer system, the standardized setups

can be used for experiments.

Bernina endstation and X-ray parameters
Photon energy range2 keV – 13.0 keV  
Beam profileFocused down to 2x2 µm2 (fwhm, measured) to unfocused 1000x1000 µm2 (fwhm, photon energy dependent).  
BandwidthMonochromatic (Si(111) routinely used, InSb(111), Si(311) and pink beam (~0.2% of fundamental, transmissive single FEL pulse spectrometer available), special modes like broadband SASE operation possible.  
Pulse lengthStandard SASE pulse length ~50 fs (fwhm), short pulse options at cost of pulse energy down to ~20 fs.  
EnvironmentHe or ambient atmosphere, platform for user-supplied chambers, N2 and He based cryostream coolers down to ~80 K. Vacuum chamber available for low sample Temperature (<5 K), high field THz excitation, and tender X-ray range.  
Sample systemsSolids: single crystals, powders, amorphous systems. Liquid/Gas only with user supplied equipment.  
Detectors and Spectrometer
  • 1.5 M Jungfrau detector
  • 16 M Jungfrau detector
  • Diodes or single element (0.5 M) Jungfrau detectors for multi- purpose applications.
  • Resonant Inelastic X-ray spectrometer with spherical diced Si(844) analyzer crystals
  • Polarisation analyzer
  • Limited X-ray emission spectrometer options upon request
  

Following table lists distances of significant beamline components from the sample location. 

Beamline componentPosition along Bernina beamline (swissfel z direction)
 

relative to straight beam sample interaction position

relative to standard KB deflection sample interaction position (theta = 4 mRad)

Profile monitor downstream of sample.

3725 mm

3716 mm

Straight beam sample location

0

-9.18

Sample location at 4mRad KB mirror angles (standard)

9.18 mm

0

Diamond window at Upstream diagnostics exit

-1330 mm

 

Attenuator targets in upstream diagnostics (att_usd)

-1420 mm

 

Target of time tool (tt_kb) / Profile monitor (prof_kb)

-1520 mm

 

Diamond window at Upstream diagnostics entry

-1945 mm

 

Horizontally deflecting/focusing KB mirror

-2600 mm

 

Vertically deflecting/focusing KB mirror

-3350 mm