Flexible optical layouts based on cylindrical mirrors with sagittal curvature for high-stability beamlines

Sergio A. L. Luiz; Artur C. Pinto; Humberto R. Junior; Bernd C. Meyer; Ana C. Zeri; Florian Meneau; Antonio A. Malfatti-Gasperini; Márcio M. Soares; Guilherme A. Calligaris; Luciano B. Candido; Harry Westfahl Jr.

doi:10.1117/12.2568920

21 August 2020 Flexible optical layouts based on cylindrical mirrors with sagittal curvature for high-stability beamlines

Sergio A. L. Luiz, Artur C. Pinto, Humberto R. Junior, Bernd C. Meyer, Ana C. Zeri, Florian Meneau, Antonio A. Malfatti-Gasperini, Márcio M. Soares, Guilherme A. Calligaris, Luciano B. Candido, Harry Westfahl Jr.

Author Affiliations +

Proceedings Volume 11493, Advances in Computational Methods for X-Ray Optics V; 1149305 (2020) https://doi.org/10.1117/12.2568920
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Cylindrical mirrors with sagittal curvature are known for non-ideal focusing due to strong aberrations. However, the small emittance of undulator sources at new upcoming fourth-generation synchrotrons causes the footprint of the beam on a sagittal cylinder to be small enough to permit almost aberration-free focusing. The use of side deflecting sagittal cylinders in the optical design of synchrotron beamlines brings advantages to the beam performance: a) it improves stability, because horizontal plane is less a effected by ground vibrations, b) it keeps the beam height with respect to the floor, c) the beam is less sensitive to slope errors in the sagittal plane. Furthermore, a sagittal cylinder in combination with a meridional cylinder or ellipse allows the change of focal spot size and position. In this work, we present the optical scheme of three beamlines including sagittal cylinders for the fourth-generation synchrotron SIRIUS. In MANACA beamline (protein crystallography) a sagittal cylinder and a meridional ellipse face each other in the horizontal plane. By changing the incidence angle of both mirrors in the same direction beam size at sample can be changed from 10 to 100 μm. In SAGUI beamline (SAXS and XRD) both mirrors face the same direction. Changing the incidence angle in opposite direction enables to change the focus position by tens of meters. In CATERETE beamline (Coherent Diffraction Imaging) the two mirrors face each other to create a highly coherent plane wave with a focal spot of 40 μm. We compare the performance of each beamline with their ideal optics counterpart, using wave propagation simulations (SRW).

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Sergio A. L. Luiz, Artur C. Pinto, Humberto R. Junior, Bernd C. Meyer, Ana C. Zeri, Florian Meneau, Antonio A. Malfatti-Gasperini, Márcio M. Soares, Guilherme A. Calligaris, Luciano B. Candido, and Harry Westfahl Jr. "Flexible optical layouts based on cylindrical mirrors with sagittal curvature for high-stability beamlines", Proc. SPIE 11493, Advances in Computational Methods for X-Ray Optics V, 1149305 (21 August 2020); https://doi.org/10.1117/12.2568920

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