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  • Post doctoral position : booster’s diagnostics | French national synchrotron facility

Post doctoral position : booster’s diagnostics | French national synchrotron facility

Mar 15 2022

SOLEIL is the French national synchrotron facility, located on the Saclay Plateau near Paris. It is a multi-disciplinary instrument and a research laboratory, whose mission is to run research programs using synchrotron radiation, to develop state-of-the-art instrumentation on the beamlines, and to make those available to the scientific community. SOLEIL, a unique tool for both academic research and industrial applications across a wide range of disciplines including physics, biology, chemistry etc., is used by over 5 000 researchers coming from France and abroad. The facility is a “public” company employing about 500 people, founded by the CNRS and the CEA, and partner of the Paris-Saclay University.

Current studies for a major upgrade of the SOLEIL ring are underway in phase with an explosive wave of constructing a new generation of LS rings, called Diffraction Limited Storage Rings (DLSR), thanks to a marked progress of the technology over the last decade in the international light source (LS) community. To be able to continue serving as a top-class light source in future, SOLEIL has officially launched R&D studies for its upgrade since beginning of 2019 and a CDR (Conceptual Design Report) was compiled at the end of 2020. The project is presently in the TDR (Technical Design Report) phase with the goal of delivering a TDR by the end of the year 2023.

This position is for the Diagnostics and Timing group, which belong to the Accelerator and Engineering Division of SOLEIL. The group is currently composed of 4 engineers/researchers and 2 technicians.

The Diagnostics and Timing Group is responsible of the conception, design, tests and operation of the diagnostic systems and instrumentation to characterize and stabilize the beam of SOLEIL accelerators (Linac, booster and storage ring) and the timing system for the accelerators and the beamlines.


In the framework of the upgrade of SOLEIL, aiming at a dramatic reduction of the horizontal emittance, many diagnostics will have to be updated or re-designed.

The successful candidate will be engaged in the design of the diagnostics intended for electron beam transverse distribution of the booster ring:

– An electron beam imager based on a scintillator screen and a high-resolution imaging system (destructive measurement of electron beam sizes on scintillator).

– A visible synchrotron radiation monitor using one of the booster’s dipole (non-destructive, i.e. on-line, measurement of electron beam sizes in the dipole). This diagnostic consists of a flat mirror inserted in the dipole vacuum chamber to collect the dipole synchrotron radiation, a couple of downstream mirrors to transport the radiation down to a camera, and an imaging system for source point imaging with high resolution.

– An emittance monitor based on a scintillator screen and a high-resolution imaging system (destructive measurement of electron beam emittance on scintillator)

The candidate will have to carry on the study, the design and the test (with the possibility to install prototype on the current machine) of the future equipment.

He or she shall be regularly given opportunities to participate in conferences and workshops and present his (or her) works, as well as making publications of the outcomes in appropriate journals.

II.Qualification and experience

The candidate is expected to possess a PhD degree in physics or equivalent competence, related to electron beam or photon beam diagnostics.

We are looking for a motivated candidate with experience in numerical simulations and in accelerator physics. Knowledges in scientific programming languages such as Python and Matlab will be highly appreciated.

III.General conditions

The offer concerns a post-doctoral contract for 12 months-period with the possibility of one year renewal.

The contract will start as soon as possible in 2022.

Source: Synchrotron Soleil