Carnauba (Coherent X-rAy NAnoprobe BeAmline) is a beamline for multiple advanced techniques using X-ray absorption, scattering and emission, and combining coherent light with nano-focusing. It is the longest of Sirius beamlines, with 145 meters distance between the light source and the sample environment. This length is required to produce a high optical demagnification and attain a focus size of about 30 nm.
The Carnauba beamline cover the energy range of 2 to 14 keV, allowing the measurement of the K-edge of lighter elements, such as phosphorus and sulfur. The analysis of various types of nano-structured materials is possible, allowing 2D and 3D images with nanometer resolution of composition and structure using contrast absorption, emission and diffraction spectroscopy. These images are obtained by scanning the sample with nanometer precision in relation to the synchrotron radiation beam. Some of the main areas which will benefit from these techniques will be the Material Sciences (catalysts, magnetism, semiconductors); Nanotechnology (information, health); Environmental Sciences (geosciences, materials under extreme pressures, petrology); and Life Sciences (medical and biological applications).
The optical design of this beamline takes advantage of the low emittance of Sirius, allowing the beam at the sample to be at the same time nanometric and of relative low divergence, with a large depth of focus. The latter is an important aspect for the phase contrast diffraction technique.