Sources & Accelerators

SOLEIL is a source of the third generation type. This generation of synchrotrons was built in the 1990’s and is characterized by a synchrotron light emission all along the storage ring circumference, in the bending magnets – which bend the electrons trajectory – as well as in the straight sections equipped with the wigglers and the undulators. At SOLEIL, more than 42% of the storage ring circumference was reserved to these exceptional light sources called “The insertion devices”.

Storage Ring
Insertion devices
Tribute to Ti Ruan  

All the staff at SOLEIL were deeply saddened by the news that Ti Ruan had passed away on 27th March, 2014, aged 78.

A graduate of Tsinghua University, one of the most renowned universities in China, Ti Ruan began his professional career in 1963 at the Beijing Broadcast Equipment Factory (BBEF), where he worked until 1992, first as a development engineer, then as chief engineer from 1987 to 1992. After working for several years in the field of radio transmitters, he was put in charge of building a 30 kW - 204 MHz amplifier for the Hefei light source, then two 100 kW - 200 MHz amplifiers for the Beijing Electron Positron Collider. At the same time, Ti Ruan was already beginning to take an interest in the possible use of solid state technology in RF amplifiers, but without the opportunity to try out his ideas...

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Storage Ring

The storage ring characteristics condition part of the performance of the whole installation. SOLEIL storage ring is extremely compact and however reserves a very large part to the most powerful Light source. It was also conceived to satisfy all the categories of users, as well by the choice of the nominal energy of mahine operation as byt he two possible operating modes.

 Main Parameters | Parameters at the source points | Operation Modes | Brilliance |
Beam position stability |Bunch length |


SOLEIL machine is made up of 2 accelerators (a linear accelerator, the LINAC, and a circular one, the BOOSTER) and of a storage ring, a 354 m perimeter polygon - it accomodates the magnetic elements (dipoles and undulators) which bend the electrons trajectory. With each curve, then, the electrons lose energy, which produces synchrotron light.

Insertion devices

Third generation synchrotrons, such as SOLEIL, use magnetic devices called "undulators", which are inserted along the storage ring perimeter. They consist of sets of coils or permanent magnets juxtaposed along two jaws which force the electrons into an undulated movement. With each undulation, the electron bunches emit a thin beam of coherent light. 

Insertion devices | HU640 | HU256 | HU80




 Machine schedule :
2013 | 2014

 Machine status

 The front ends
(november 2006)



 Outreach area