# Cateretê

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Cateretê or jacarandá branco (Machaerium paraguariense) is a tree found in the southern and southeastern regions of Brazil (Photo: Bruna Luiza Soares Alves)

# OVERVIEW

Cateretê (Coherent And TimE REsolved scatTEring) is a beamline optimized to perform Coherent X-ray Diffraction Imaging (CXDI) and X-ray Photon Correlation Spectroscopy (XPCS). Among its applications are the investigation of the dynamics of biological phenomena and nanoscale structures in the areas of petroleum, catalysts and polymers, as well as in solving problems of the food, pharmaceutical and cosmetic industries.

The Cateretê beamline will provide unique capabilities in biological and soft materials imaging and dynamics experiments with particular focus on the application of coherent X-ray scattering and diffraction techniques. Coherent X-ray diffractive imaging (CXDI) and X-ray photon correlation spectroscopy (XPCS) experiments will be at the heart of the activities planned at the Cateretê beamline, but also time-resolved small angle X-ray scattering, which will benefit of the high flux of the source. The Cateretê beamline will operate from the tender X-rays, 3 keV up to 12 keV, for imaging of biological and nanomaterials, making the most of the coherence properties of the radiation proveded by Sirius.

When Sirius become operational, it will be the lowest emittance storage ring worldwide, delivering a beam with unprecedented coherence properties, improving both time and space resolution by several orders of magnitude and proposing new experimental stations not available elsewhere. Thus the Cateretê beamline aims at giving the user community new opportunities to investigate the structure and dynamics of bio and nanomaterials with unprecedented resolution in space and time.

The Cateretê beamline will make possible to answer diverse and multiple questions related to life sciences (biological and medical applications), structural biology (proteins, lipids, macromolecules) and the vast field of material sciences including nanotechnology (energy, food and health, photonics), polymer sciences, catalysis, rheology and environmental sciences (geosciences, oil prospection, catalysis). Therefore all major research fields, from physics, chemistry and biology, but as well industrial aspects will be explored on Cateretê.

# LAYOUT & OPTICAL ELEMENTS

ElementTypePosition [m]Description
SOURCE
VFMVertical focusing mirror27
Mono4 crystal monochormator44Fixed exit, double channel-cut
HFMHorizontal focusing mirror45
Sample80
DetectorMedipix80-90Medipix3

# PARAMETERS

ParameterValueCondition
Energy Range (keV)3-12
Energy Resolution ($\Delta$ E/E)$10^{-4}$
Energy ScanNo
Beam Size ($\rm \mu m$)30 x 30