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Internship : Efficient modelling of Intra-Beam Scattering effect (IBS)

SOLEIL is the French national synchrotron facility, located on the Saclay Plateau near Paris. It is a multi-disciplinary instrument and research laboratory whose mission is to conduct research using synchrotron radiation, to develop cutting edge instrumentation on the beamlines, and to make these developments available to the scientific community. SOLEIL synchrotron, a unique tool for both academic research and industrial applications across a wide range of disciplines including physics, biology, chemistry etc., opened in 2008. It is used annually by thousands researchers from France and abroad. SOLEIL is based on a synchrotron source that is state-of-the-art both in terms of brilliance and stability. This large scale facility, a partner of the Université Paris Saclay, is a “publically owned” private company, founded by the CNRS and the CEA.

Beam collective effects limit the performance of many large-scale particle accelerator facilities. Billions of particles inside a beam interact with each other (e.g., intra-beam scattering) and with their environment via electromagnetic forces (e.g. monopolar or dipolar wakefields). This can lead to collective instabilities, leading to beam losses or degradation of the beam qualities.

In the context of SOLEIL's ongoing upgrade towards a fourth-generation light source accelerator facility, we propose a 6-month internship study on the IBS (Intra-Beam Scattering) effects:

The origin of IBS is collisions between electrically charged particles such as electrons inside a beam circulating in a storage ring. When the particles find themselves under a small volume in space, they start to expel from each other feeling the electro-magnetic forces generated by the others. These collisions can transfer particle energy from one dimension to another. IBS can increase the energy spread of the beam as well as its transverse emittance. The student's tasks will include developing an effective simulation model of IBS to be used in an existing particle tracking code, comparing this model with analytical estimations, and conducting particle tracking simulations of IBS for the SOLEIL II project.

The student, 1st or 2nd year Master's level in general physics or particle accelerator physics, is expected to have a good understanding of classical and relativistic dynamics, electromagnetism, and basic understanding of accelerator physics. He (she) will work in the Accelerator Physics group, which is in the Accelerators and Engineering Division of SOLEIL. The group is composed of 6 staff members and three postdocs. The necessary computing resources (a PC, an account on the computing server etc.) shall be provided to the student.

For more information, please contact  Vadim Gubaidulin (the tutor of this internship) at and/or Alexis Gamelin (