Sirius is a diffraction-limited storage ring synchrotron light source at the Brazilian Synchrotron Light Laboratory (LNLS) in Campinas, São Paulo State, Brazil. 4 metres (1,701 ft), a diameter of 165 metres (541 ft), and an electron. Sirius, the new Brazilian synchrotron light source, is the largest and most complex scientific infrastructure ever built in Brazil. The produced. The SIRIUS facility is open to regular external users with 6 state-of-the-art beamlines in operation and 4 under advanced commissioning. Called UVX, operated from 1997 to 2019, benefiting approximately one thousand researchers each year.