Speaker: Hélio C. N. Tolentino – Head of the Heterogeneous and Hierarchical Matter Division of LNLS
Title: COMMISSIONING, FIRST EXPERIMENTS, AND OPPORTUNITIES AT THE CARNAÚBA BEAMLINE
Abstract: The X-ray nanoprobe beamline CARNAÚBA [1-4] at Sirius/LNLS has been operating for technical commissioning since November 2020 and for scientific commissioning since October 2021. The beamline design is for high-resolution multi-analytical and coherent X-ray imaging techniques over the energy domain of 2.05 to 15 keV. An all-achromatic mirror-based optics provides the nano-focused beam . The beamline can operate in pink (high flux) or monochromatic (high energy resolution) mode. A 4-bounce Si(111) crystal monochromator (4CM)  provides the latter mode, with a resolving power of 10000 over the entire energy range. The first nanoprobe station, named TARUMÃ, provides a diversity of sample environments for in situ, operando, cryogenic, and in vivo experiments for research areas in chemistry, physics, geophysics, biology, agriculture, environment, and energy, to name a few. The sample (or sample environment) is raster-scanned through the nanoprobe to generate fast two-dimensional maps of simultaneous contrasts, which can then be combined with a rotation for computed tomography. The second nanoprobe station, which is under UHV and cryogenic, is under construction.
On behalf of the LNLS team, I will present in this lecture a few aspects of technical commissioning and the first relevant scientific cases studied. The current beamline performance is getting to the main specifications, with the predicted photon flux and a focus size close to 160×140 nm2, measured in fluorescence and transmission modes. Using X-ray ptychography, both with pink and monochromatic beam, improves the resolution down to 20 nm, as demonstrated by preliminary analysis. As far as the first experiments are concerned, I will show results in agriculture, geophysics, solar energy, along with innovative instrumentation solutions for sample environments.
 Tolentino, H. C. N., et al., “CARNAÚBA: The Coherent X-Ray Nanoprobe Beamline for the Brazilian Synchrotron SIRIUS/LNLS”, Journal of Physics: Conf. Series 849 (2017) 012057.
 Tolentino, H. C. N., et al., “TARUMÃ station for the CARNAÚBA beamline at SIRIUS/LNLS.” X-Ray Nanoimaging: Instruments and Methods IV. Vol. 11112. International Society for Optics and Photonics, 2019.
 Geraldes, R. R., et al., “Design and Commissioning of the TARUMÃ Station at the CARNAÚBA Beamline at SIRIUS/LNLS”, Proc. MEDSI 2020, 2021.
 Tolentino, H. C. N., et al., “X-ray microscopy developments at Sirius-LNLS: first commissioning experiments at the Carnauba beamline.” X-Ray Nanoimaging: Instruments and Methods V. Vol. 11839. International Society for Optics and Photonics, 2021.
 Moreno, G. B. Z. L., et al., “Exactly-constrained KB Mirrors for Sirius/LNLS Beamlines: Design and Commissioning of the TARUMÃ Station Nanofocusing Optics at CARNAÚBA Beamline”, Proc. MEDSI 2020, 2021.
 Saveri Silva, M., et al., “Four-Bounce Crystal Monochromators for the Sirius/LNLS Beamlines”, in Proc. MEDSI 2020, 2021.