The KMC-2 beamline provides linearly polarized light in the energy range of 4 keV – 15 keV for X-ray absorption spectroscopies (EXAFS, XANES), fluorescence, diffractometry and reflectometry.

Beamline data
Segment H09
Location (Pillar) 11.2
Source D9.2 (Dipole)
Monochromator Si 111, Ge-graded
Energy range 4 - 15 keV
Energy resolution 1/4000
Flux dipole, 1e7 - 1e10
Polarisation linear horizontal
Divergence horizontal 2.5 mrad
Divergence vertical 0.5 mrad
Focus size (hor. x vert.) 250 μm x 600 μm (4.8 μm x 4.8 μm with capillary optics; at XANES only, not available at Diffraction)
User endstation not possible
Distance Focus/last valve 2500 mm
Height Focus/floor level 1465-1490 (depending on lateral position) mm
Beam availability 24h/d
Phone +49 30 8062 14623
Applicable station(s)
KMC-2 Diffraction 20-1000 °C

The beamline provides an experimental set-up for EXAFS, XANES, and X-Ray fluorescence measurements at-air in the energy range of 4 keV – 15 keV. Beam intensity is stabilized by MOSTAB electronics with an accuracy of 0.3 %. The detector system consists of three ionization chambers, a Si-PIN photodiode for fluorescence measurements, a scintillation counter and an energy-dispersive detector (Bruker X-Flash). An add-on microprobe capillary system with the spatial resolution of >3.6 µm is available for micro-EXAFS, micro-fluorescence and micro-diffraction experiments. See endstation KMC-2 XANES for details.

For X-Ray diffractometry and reflectometry the experimental hutch is equipped with a 6-axis HUBER goniometer and a VANTEC 2000 area detector. An alternative point detector for high angular resolution is available. See endstation KMC-2 DIFFRACTION for details.

Original references
[1]    A. Erko, I. Packe, W. Gudat, N. Abrosimov, A. Firsov: The Crystal Monochromator Based on graded SiGe Crystals,  Nuclear Instruments and Methods in Physics Research  A467–468, 358–361 (2001).
[2]    A. Erko, I. Packe, C. Hellwig, M. Fieber-Erdmann, O. Pawlizki, M. Veldkamp, W. Gudat, KMC-2: the new x-ray beamline at BESSY II, AIP Conference Proceedings 521, 415-418 (2000).