The source is located at the cell 2 of the storage ring. Two undulators U21.4  and one U35 provide high photon flux with a low divergence. Only the central radiation cone of the undulator is used. Unless otherwise stated, all beam sizes correspond to FWHM values. The beamline optics consist of a cryogenic (liquid nitrogen) cooled Si-111 channel-cut monochromator and a double mirror focusing setup. The standard beam size is 50 µm x 120 µm (vertical and horizontal, respectively) with divergence of 15 µrad x 20 µrad. The beamline is optimised for experiments using a fixed wavelength around 0.1 nm (12.2 keV), but a wavelength range between 0.073 nm and 0.16 nm is accessible. The maximum photon flux at the sample position is of the order of  5 x 1013 photons/sec/100 mA with Δλ/λ = 0.015 % at 12.2 keV.

Schematic layout of the beamline depicting the main components of the instrument.

[1]  T. Narayanan, M. Sztucki, T. Zinn, J. Kieffer, A. Homs-Puron, J. Gorini, P. Van Vaerenbergh and P. Boesecke, J. Appl. Cryst., 55, 98 (2022);

[2] T. Narayanan, M. Sztucki, P. Van Vaerenbergh, J. Léonardon, J. Gorini, L. Claustre, F. Sever, J. Morse and P. Boesecke, J. Appl. Cryst., 51, 1511 (2018);

[3] P. Van Vaerenbergh, J. Léonardon, M. Sztucki, P. Boesecke, J. Gorini, L. Claustre, F. Sever, J. Morse, and T. Narayanan,  AIP Conf. Proc., 1741, 030034 (2016);

[4] J. Léonardon, P. Van Vaerenbergh, T. Narayanan, et al., Design of a new detector tube for wide, small and ultra small-angle X-ray scattering, MEDSI Conf. Proc. (2014).


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