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).
CARNAÚBA (Coherent X-Ray Nanoprobe Beamline) is an X-ray beamline under construction for the SIRIUS light source at LNLS (Brazilian Synchrotron Light Laboratory). The aim of the beamline is to provide multi-analytical and coherent X-ray imaging techniques based on achromatic optics in the energy range between 2 and 15 keV. Computed tomography will extend these techniques into three dimensions. Two end-stations are under development: an all-invacuum nanoprobe (SAPOTI) and a sub-microprobe (TARUMÃ), with a more flexible sample environment and much larger working distance. TARUMÃ will cover a large variety of scientific areas, from environmental, geophysical, agricultural and biological research to energy and more condensed matter related areas. Its design characteristics, with its mechanical design heavily based on precision engineering concepts and predictive modeling, are presented here, as well as some prospects on in situ, in operando and cryogenic sample environment experiments.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.