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About the beamline

PolyX is a compact beamline for X-ray microimaging and X-ray microspectroscopy in the energy range 4-15 keV. The name PolyX originates from polycapillary X-ray optics that is used for X-ray focusing and from the possibility of using polychromatic X-rays to increase the X-ray flux from SOLARIS bending magnet in the hard X-ray energy range.

Experimental techniques

  • X-ray microradiography and microtomography µCT  (absorption and phase contrast),
  • X-ray fluorescence microscopy (µXRF),
  • X-ray absorption (µXAS) and emission (µXES) spectroscopy.

PolyX enables imaging of 2D and 3D structure, elemental distribution, and chemical phases in investigated samples. 

PolyX is currently under construction and the start of operation is planned for 2023.

PolyX beamline summary













PolyX may find applications in:

  • biomedical sciences,
  • material science, physics & chemistry,
  • earth science & environmental sciences,
  • cultural heritage.

The experimental geometry at PolyX can be easily reconfigured and the beamline has a dedicated area for user setups, which enables non-standard experiments and test. Potential PolyX users are encouraged to propose and consults non-standard experiments with PolyX staff.

Beamline parameters

Beamline Parameters


Bending magnet (critical energy 2keV)

Ee=1.5 GeV, B=1.31T, Imax=500 mA, σH=44 µm, σV=30 µm

Angular acceptance

1.5 mrad horizontally

Sample position

~14.5 m from the source

Energy range

4 – 15 keV

Operation modes

“White beam”: 1012 ph/s/mm2

“High flux”:  double multilayer monochromator (DMM): 1011 ph/s/mm2 (@8 keV), BW 1-2%

“High resolution”: double crystal Si(111) monochromator (DCM): 109 ph/s/mm2 (at 8 keV), BW 2×10-4

Max. beam size

20 mm (H) × 4 mm (V) – non focused

Min, focus size

Polycapillary:  8 µm – 200 µm

Monocapillary: 2 µm

Max. flux in 10 µm focal spot @ 8 keV

DMM: 1011 ph/s

DCM:  109 ph/s

Sample environment

Air, helium, low vacuum (user setups)

Main techniques

Standard: X-ray microimaging and µCT (absorption and phase-contrast), µXRF, confocal µXRF , µXAS (wavelength and energy-dispersive),

Non-standard: 3D multibeam X-ray microscopy, µXRF tomography, µXES, µXRD  + user ideas


Energy spectra

Energy spectra of PolyX simulated through a 1 mm × 1 mm pinhole at optics or sample position at 14.5 m from the bending magnet source (left, blue) and integrated vertically (right, orange). Simulation considers beamline window and X-ray attenuation in the air.

polyX flux














Energy spectra of PolyX through a 1 mm × 1 mm pinhole at optics or sample position at 14.5 m for aluminum filters with various thickness. Legend lists the total number of photons/s in the white beam for each filter.

polyx white beam spectra