LNLS - Laboratório Nacional de Luz Síncrotron

Sirius: New Brazilian Synchrotron Light Source

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Sirius: the new 3 GeV source

In the last 4 years, the laboratory has been working on a 3 GeV source to replace the existing one. During the first meeting of the Sirius Machine Advisory Committee it was strongly recommended to review the specifications of the storage ring in order to assure that the new synchrotron light source will  be a state of the art equipment 10 years after its inauguration. This challenge was taken and a new lattice, with 5-bend achromatic cells and emittance of 0.28 nm.rad was proposed. Several prototypes of the accelerators have been built and tested.

Thirteen beamlines are now included in the budget plan. Our objective is to cover the range 10 eV to 100 keV with undulators and wigglers. We have started to work on the conceptual design of the first beamlines with the objective to have the PDR (Preliminary Design Report) ready in the second semester of 2013 to start the construction.

The ground breaking will take place in May 2013, on a new and better site, next to the actual CNPEM campus (see the location at this page bottom).

An emittance of 0.28 nm.rad is a big challenge for the optics and the tolerances on the beamline elements.

Sirius Main Parameters


Download the complete Sirius Design Report (SDR)

2nd version, updated on January 2013


Sirius low emittance 5-BA lattice


Sirius: 280 pm.rad emittance

Electron beam size and divergence (rms)

(Coupling = 1%)



Calculated brilliance without including the energy dispersion of the electrons allowing a comparison with Max IV and Diamond. However, for the users it is important to take it into account (see bellow)


X-ray Brilliance on Axis (including energy dispersion)


Soft x-ray Brilliance on Axis (including energy dispersion) for a Linear Undulator


Soft X-ray Elliptical Undulator (EPU) Brilliance: λu = 8 cm, L = 3.5 m, gap = 10 mm

VUV Brilliance on Axis (including energy dispersion) for an EPU: λu = 20 cm, L = 4 m, gap = 10 mm

Sirius installation layout

(click to expand)