# Sapucaia

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Sapucaia is the popular name of the Lecythis pisonis species, common to the Amazon Forest and Atlantic Forest. (Photo: Fernando Cunha)

# OVERVIEW

The main technique of this beamline, the Small Angle X-ray Scattering (SAXS) in solution, is a complementary technique to the Protein Crystallography of the Manacá beamline and allows understanding basic biological mechanisms by determining complex structures of proteins, without crystallization of macromolecules.

The Sapucaia beamline will cover a wide range of research fields in physics, chemistry and biology, and industrial aspects. With the techniques available in this line, you can get information about form, organization and dynamics of particles and inhomogeneities of samples from a few Å to a few micrometers. They will answer several questions related to life sciences (biological and medical applications), structural biology (protein, lipids, macromolecules) and a wide field of materials science, including nanotechnology, polymers, catalysts, rheology and environmental sciences.

The main technique of this beamline, the Small Angle X-ray Scattering (SAXS) in solution, is a complementary technique to the Protein Crystallography of the Manacá beamline and allows understanding basic biological mechanisms by determining complex structures of proteins, without crystallization of macromolecules.

As in the Paineira beamline, the optical design aims to obtain an X-ray beam with low divergence, high flux and energy from 4 to 24 keV. The optics of the beamline will be optimized for 12 keV (the critical energy of the superbend  and the expected flow in the sample is $10^{12}$ ph/s.

The compromise between size and beam divergence in the detector position will be carefully designed from the position of the optical elements in order to enable SAXS experiments in ultra-low angles (called USAXS). Furthermore, an innovative approach combining SAXS / WAXS and spectroscopy techniques (XANES, Raman and UV-vis), will be developed to address fundamental scientific processes and structures.