Missions

multi-physics model development; plasma modeling, accelerator modeling, high energy physics

Activités

Main tasks :
- derive the main équations describing the problem
- numerical model development
- results analysis
Secondary task :
- assist the experiment
- reporting / communications

Compétences

- solid background in plasma physics and accelerators
- modeling of plasma sources and charged particle extraction systems
- programming
- data processing
- communication written / oral

Contexte de travail

The subject of the proposed Ph.D. thesis is to study, using numerical simulations and in close coordination with experiments, the extraction of multi-charged ion beams from a particle gas ion source designed to fed a high-energy accelerator. The ions are extracted from a magnetized plasma whose electrons are heated by electron cyclotron resonance (ECR). The work will start with the recovery of a self-consistent particle code simulating the equilibrium state of a multi-charged ion source plasma. The first objective of the thesis is to obtain the particle fluxes at the output of the ion source plasma (electron and ion position and velocity distribution function). These data will then be used as input to the existing Particle in Cell (PIC) ONIX (Orsay Negative Ion eXtraction) code, which will be adapted to simulate the extraction of multiply-charged positive ions from the source plasma using a high-voltage electrode system. The second objective of this thesis will include a phase of experimental measurements on the LPSC's high-current experimental facility, where the transverse emittances of the ion beams produced by the PHOENIX V2 source will be measured, as well as the energy spectrum of the electrons co-extracted from the plasma.

Finally, a simulation-experiment comparison will enable us to refine the simulation model and provide new insights into ECR ion source plasma and the shaping of beams from this type of source. This comparison will involve modeling the propagation of the high-energy beam (using codes such as IBSimu or ONAC) and the ion source's analysis line, made up of a magnetic lens and a dipole. The SACRE project is led by LPGP Orsay in collaboration with LPSC Grenoble.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.

Contraintes et risques

The partner laboratories have restrictive access.

Informations complémentaires

This work is supported jointly by CNRS Ingenierie and CNRS Nucléaire & Particules within the 80 Prime framework.