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Beamline I911-5 is a macromolecular crystallography X-ray station, one out five experimental stations at the I911 beamline. The I911-5 station is a fixed wavelength station (wavelength 0.91 Å). The wavelength is chosen to have a large anomalous signal from bromine. The beam is first monochromatized and horizontally focused by a bent silicon crystal working in Bragg geometry and then focused in the vertical by a 400 mm, curved multi-layer mirror. The high-flux photon beam is produced by a super-conducting multi-pole wiggler.
The station will eventually be equipped with a planar diamond monochromator and the wavelength changed to 0.97 Å.
Thomas Ursby, Beamline Manager I911
Marjolein Thunnissen, User Support Coordinator I911
References:
C.B. Mammen, T. Ursby, M. Thunnissen and J. Als-Nielsen, Bent Diamond Crystals and Multilayer Based Optics at the new 5-Station Protein Crystallography Beamline `Cassiopeia' at MAX-lab, AIP Conference Proceedings, 705, 808-811, 2004.
C.B. Mammen, T Ursby, Y Cerenius, M Thunnissen, J Als-Nielsen, S Larsen and A. Liljas, Design of a 5-Station Macromolecular Crystallography Beamline at MAX-lab, Acta Physica Polonica A, 101, 595, 2002.
Technical data:
| Source |
Multi-pole wiggler, period= 61 mm, 49 poles, Bmax = 3.5 T. |
| Monochromator |
Bent silicon crystal, horizontally focusing (R = 12 m).
Will be planar diamond monochromator. |
| Mirror |
Multilayer mirror, curved to focus in the vertical (R = 400 m). |
| Wavelength |
0.91 Å. Will be 0.97 Å. |
| Wavelength resolution |
E/dE ~ 103 |
| Photon flux on sample |
5 x 1010 photons / s in 0.3(h) x 0.2(v) mm2 (measured) |
| Spot size on sample |
0.3(h) x 0.15(v) mm2 (measured) |
| Experimental techniques |
Macromolecular crystallography, Small molecule crystallography, Powder diffraction |
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