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SOLEIL on 1 June 2005
Diagram of machinery
View of the interior of facility

SOLEIL ("Sun" in French) is a synchrotron facility near Paris, France. It performed its first acceleration of electrons on May 14, 2006. The name SOLEIL is a backronym for Source optimisée de lumière d’énergie intermédiaire du LURE (LURE optimised intermediary energy light source), LURE meaning Laboratoire pour l'utilisation du rayonnement électromagnétique.

The facility is run by a civil corporation held by the French National Centre for Scientific Research (CNRS) and the Commissariat à l'Énergie Atomique (CEA), two French national research agencies. It is located in Saint-Aubin in the Essonne département, a south-western suburb of Paris, near Gif-sur-Yvette and Saclay, which host other facilities for nuclear and particle physics.

Member of the UniverSud Paris.

SOLEIL also hosts IPANEMA, the European research platform on ancient materials (archaeology, palaeontology, past environments and cultural heritage), a joint CNRS / French Ministry of Culture and Communication research unit.

Main parameters[edit]

SOLEIL contains electrons travelling with an energy of 2.75 GeV around a 354 m circumference. It takes the electrons 1.2 μs to travel around this ring at almost the speed of light; 847,000 times per second.[1]


  1. ^ "Sources and Accelerators". SOLEIL. Retrieved 2009-11-26. 

External links[edit]

Coordinates: 48°42′36″N 2°08′42″E / 48.71000°N 2.14500°E / 48.71000; 2.14500