Simulações ópticas para o comissionamento da linha de luz SAPUCAIA
Abstract
The SAPUCAIA beamline is one of the research stations at the Brazilian Synchrotron Light
Laboratory (LNLS) and is in the final stages of installation. It will employ the small-angle X-ray
scattering technique to characterize the structure and morphology of nano- and microstructured
materials, operating in the energy range of 5 to 18 keV. The planned photon source for SAPUCAIA is a KYMA undulator. However, the KYMA undulator will only be available in the
first semester of the next year, leading to the decision to perform the initial commissioning –
a process to prepare the beamline for operation – using the PAPU undulator, a device built
by researchers at CNPEM. The modification of the undulator has significant implications for
beam characteristics (size, divergence, flux), and studies need to be conducted to enable the
proper commissioning of the beamline. This work aims to conduct these studies through optical
simulations to support and optimize the commissioning process of the SAPUCAIA beamline
with the PAPU undulator. Specifically, efforts were made to identify beam properties such as
size, shape, and position at each Beam Position Monitors (BPM), using specialized programs
including SHADOW, SRW, and SPECTRA. Through simulations, it was possible to analyze
the beam behavior along the beamline, calculate the line resolution as 1.56×10−4, and map the
effects of misalignments on the single mirror of the beamline. Additionally, not only were the
focus positions and depth of focus determined, but also the beam movement rates. The set of
information obtained contributes to and optimizes the beamline commissioning time.
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