Commissioning Results of the SAPOTI Cryogenic Nanoprobe at the CARNAÚBA Beamline at Sirius/LNLS

Abstract SAPOTI (Scanning Analysis by PtychO for Tomographic Imaging) will be the second nanoprobe to be installed at the CARNAÚBA (Coherent X-Ray Nanoprobe Beamline) beamline at the 4th-generation light source Sirius at the Brazilian Synchrotron Light Laboratory (LNLS). Working in the energy range from 2.05 to 15 keV, it has been designed for simultaneous multi-analytical X-ray techniques, including absorption, diffraction, spectroscopy, fluorescence and luminescence, and imaging in 2D and 3D. Highly-stable fully-coherent beam sizes between 35 and 140 nm, with monochromatic flux up to 10 11 ph/s/100-mA/0.01%BW, are expected with an achromatic KB (Kirkpatrick-Baez) focusing optics, whereas a new in-vacuum high-dynamic cryogenic sample stage has been developed aiming at single-nanometer resolution images via high-performance 2D mapping and tomography. This work reports the final assembly and integration of the station in a cleanroom at the LNLS. The results include: vacuum, thermal, dynamic and motion validations; metrology-assisted alignment procedures; implementation of automated and interlocked sample loading; evaluation and optimization of high-performance positioning and scanning capabilities; and integration to the EPICS control system. Technical commissioning at the beamline is expected shortly after moving the station from the cleanroom to the experimental hutch by the end of 2024.