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Photon source

source: bending magnet, radius 5.5 m, magnetic field 1.2-1.45 T
polarisation: ~80% linear horizontal
energy range: white light, critical energy 3.2 keV @ 2.0 GeV or 5.5 keV @ 2.4 GeV operation

Elettra storage ring parameters are available here.


Plane grating monochromator Bestec (SX-700 design) with a single grating

grating energy range resolving power photon flux *
1200 lines/mm 22-1000 eV 7000 @     22 eV  1×108 ph/s
6000 @     30 eV 3×108 ph/s
5000 @     40 eV 1×109 ph/s
4000 @     70 eV 5×109 ph/s
3000 @   100 eV 1×1010 ph/s
2000 @   300 eV 8×109 ph/s
1000 @ 1000 eV 5×109 ph/s

* at 300 mA ring current, 2.0 GeV; 100/200 μm entrance/exit slit apertures. For more details see the next page.

Beam dimensions

The vertical beam size (FWHM of the intensity profile) decreases with photon energy from 0.3 mm to 0.15 mm at 200 eV and stays below 0.15 mm at all higher photon energies.
In the horizontal direction the beam size is approximately 0.4 mm at all photon energies at normal incidence (60° emission off normal). This value is double at usual spectra acquisition geometry, normal emission (60° incidence off normal), i.e. 0.8 mm.

Beam position stability

In the whole tuning range the maximum vertical beam displacement is 0.1 mm.
The horizontal displacement at normal incidence (60° emission off normal) is 0.5 mm. This value is double at usual spectra acquisition geometry, normal emission (60° incidence off normal), i.e. 1 mm.

Beam intensity profiles

Ultima modifica il Mercoledì, 10 Giugno 2020 11:47