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Carnaúba Beamline

CARNAÚBA (Coherent X-rAy NAnoprobe BeAmline) is the longest beamline of the Sirius with approximately 145 meters between the light source and the sample environment, which allows  a high optical demagnification and to reach nanometric spatial resolutions. It has two endstation: TARUMÃ (Tender-to-hard X-ray for sub-micro analysis), with submicrometric beam size and variable sample environment; and the SAPOTI (Scanning Analysis by Ptycho for Tomographic Imaging) in which the beam size reaches 30 nm and the sample environment is cryogenic and in utra-high vacuum.

The CARNAÚBA beamline covers the energy range from 2.05 to 15 keV and it comprises multiple techniques based on X-ray absorption, scattering and emission. In this beamline it is possible  to access the K edges of light elements, such as phosphorus and sulfur, which are quite relevant for Life and Environmental Sciences and also L-edges of elements of technological importance, such as the Lanthanoids. In this beamline it is possible to study many types of nano-structured materials and hierarchically ordered ones through 2D and 3D images using as contrast X-ray absorption, emission, and diffraction, as well as optical emission. Some of the main areas which will benefit from these techniques are: Materials Science (catalysts, magnetism, semiconductors, electrochemistry, photonics); Nanotechnology (health, information); Environmental Sciences (geosciences, materials under extreme pressure, petrology); Cultural Heritage (arts, archeology and paleontology) and Life sciences (medical and biological applications).

The optical design of this beamline takes advantage of the Sirius low emittance, 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 later is an important aspect for the phase contrast diffraction technique.

CONTACT & STAFF

Coordination: Douglas Galante
Tel.: +55 19 3512 1140
E-mail: douglas.galante@lnls.br

Project leader: Hélio Tolentino
Tel.: +55 19 3512 1298
E-mail: helio.tolentino@lnls.br

Click here  for more information on this Facility team.

EXPERIMENTAL TECHNIQUES

Some of the techniques that could be explored in this beamline will be:

  • X-ray ptychography – Coherent X-ray Diffraction Imaging (CDI-Ptycho);
  • Scanning tomography with elemental and diffraction contrast;
  • Diffraction and Element Contrast Scanning Tomography
  • X-ray Absorption, Emission, Scattering and Diffraction with nanofocus;
  • X-ray Excited Optical Luminescence.

LAYOUT & OPTICAL ELEMENTS

Element Type Position [m] Description
SOURCE Insertion Device 0.0 Delta Undulator
M1 First Mirror 27.4 Focusing
SSA Secondary Source 54.0 Defining source aperture
M2 Second Mirror 54.3 Horizontal deflection
4CM Four-bounce Monochromator 130.0 Monochromatization
KB Mv Tarumã Vertical KB Mirror 134.2 Vertical Focusing
KB Mh Tarumã Horizontal KB Mirror 134.5 Horizontal Focusing
Sample Tarumã Sample position 135.0
KB Mv Sapoti Vertical KB Mirror 142.6 Vertical Focusing
KB Mh Sapoti Horizontal KB Mirror 142.9 Horizontal Focusing
Sample Sapoti Sample position 143.0

Tarumã

Sapoti

PARAMETERS

Parameter Value Condition
Energy Range 2.05 – 15 keV Si(111)
Energy Resolution (ΔE/E) 10-4 – 10-5
Harmonic Content < 10-5 Above 5 keV
Energy Scan Yes
Beamsize at sample [μm] @Tarumã 0.15 x 0.15 (0.55 x 0.55) 8 keV (2 keV)
Beam Divergence at sample [mrad] @Tarumã (1 x 1) All energy range
Estimated flux [ph/s/100 mA] @Tarumã 1011
Beamsize at sample [μm] @Sapoti 0.03 x 0.03 (0.12 x 0.12) 8 keV (2 keV)
Beam Divergence at sample [mrad] @Sapoti 5×5 (4 x 4) < 10 keV (12keV)
Estimated flux [ph/s/100 mA] @Sapoti 1012
Imaging Mode Scanning
Coherence Modes ~1