UE112_PGM-1

XUV undulator radiation variable polarization with PGM for meV RIXS + open port

The low-energy high-flux beamline UE112_PGM-1 with permanent meV RIXS experiment and open port for flexible end stations

location at BESSY II

location at BESSY II


List of publications
Beamline data
Segment H13
Location (Pillar) 15.1
Source UE112 (Elliptical Undulator)
Monochromator PGM with 3 gratings (300 l/mm, 600 l/mm and 1400 l/mm)
Energy range 8 - 690 eV; for extreme values (<50 eV or >400 eV) contact the beamline crew
Energy resolution 30,000 (20-150eV)
> 20,000 (150-350eV) (standard grating)
Flux > 2x1012 ph/s (20-280eV)
ca. 4x1013 ph/s (50-150eV) (standard grating)
Polarisation variable
Divergence horizontal 1.4 @ 63.5eV mrad
Divergence vertical 0.6 @ 63.5eV mrad
Focus size (hor. x vert.) optimum: ca. 0.08 x 0.08 mm (without halo)
Fixed endstation no
Flexible endstation(s)
User endstation possible
Distance Focus/last valve ca. 1068 (dist. from the CF40 centering flange ca. 1003) mm
Height Focus/floor level ca. 1396.5 (1393 mm at refocus-chamber exit) mm
Beam availability 12h/d
Phone +49 30 8062 14836
Polyimid foil (150 nm thick) Suppression at about 10 to 80 eV (foil installed)
Al foil (150 nm thick) Suppression at E > 73 eV (and < 15 eV) (foil installed)
Mg foil (240 nm thick) Suppression at E > 50 eV (and < 11 eV) (foil installed)
low-energy suppression Suppression of photon energies slightly above 21 eV, requires user installation of absorption foils. Materials such as Europium (Eu) or Neodymium (Nd) are suggested for this case.
beam spot - ca. 0.08 x 0.08 mm (without halo)

beam spot - ca. 0.08 x 0.08 mm (without halo)

Beamline setup

Beamline setup

Absolute Flux Curve (2013/2014, log scale)

Absolute Flux Curve (2013/2014, log scale)


For further information about the ID see:

Bahrdt et al., “Compensation of Beam Line Polarizing Effects at UE112 of BESSY II,” 2010, pp. 335–338. DOI: 10.1063/1.3463205

For information about the Monochromator consult:

R. Follath and F. Senf, “New plane-grating monochromators for third generation synchrotron radiation light sources,” Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 390, no. 3, pp. 388–394, May 1997. DOI: 10.1016/S0168-9002(97)00401-4

Other beamline related literature:
R. Follath, F. Senf, and W. Gudat, “Plane-grating monochromator at BESSY II using collimated light,” Journal of Synchrotron Radiation, vol. 5, no. 3, pp. 769–771, May 1998. DOI: 10.1107/S090904959800079X