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Offres de thèses
  • Cosmic Ray driven instabilities at collisionless shocks moving in a turbulent medium: implication for Cosmic Ray acceleration.

We propose a 3-year PhD project with the following title : « Cosmic Ray driven instabilities at collisionless shocks moving in a turbulent medium: implication for Cosmic Ray acceleration ».

The project will be fully granted by the CEA (french atomic energy organisation)

The thesis project aims at investigating cosmic ray acceleration at collisionless shocks accounting for a turbulent ambient medium. The project is partly analytical through the investigation of the impact of turbulence over cosmic-ray-driven instabilities growth at fast astrophysical shocks. The project has a numerical part aiming at investigating the non-linear stages of particle acceleration. The numerical tools at disposal are the particle-in-cell C++ code SMILEI and the Fortran 90 particle-in-cell-magnetohydrodynamic (PIC-MHD) code AMR-VAC to be used for long runs. The numerical side of the project will have a small part devoted to code development to upgrade the thermal gas physics of the PIC-MHD code but it will mainly consist of testing setups of shocks and particle acceleration in interaction with a turbulent medium. Collaborations with laser-plasma interaction experimentalists at LULI is foreseen.

The thesis will be conducted at the CELIA laboratory (https://celia-bordeaux.cnrs.fr/) near Bordeaux. It will be a co-supervision between Dr E. d’Humières professor at CELIA and Dr A. Marcowith staff researcher at LUPM in Montpellier. Funds for travels between Bordeaux and Montpellier will be provided with the grant. The research teams at CELIA conduct research on high power lasers, laser-plasma interaction and high energy density physics. The thesis will be hosted by the IFCIA group which is focused on theory and modeling of laser-plasma interaction and laboratory astrophysics. It has regular access to the largest supercomputers in France for computing time.

The grant will amount to approximately 1800 euros per month including health insurance. The PhD goes with some possibilities to have supplementary teaching duties at the university which comes into complement to the main salary.

We encourage master students with a good background in plasma physics to apply. Some experience in computational physics is also welcomed.

 

PhD starting date: from September 1st 2025 . It can be delayed by a few months but not later than December 1st 2025.

 

All applications will be fully considered before April 11th 2025

 

For any inquiry please notify us at:

emmanuel.dhumieres@u-bordeaux.fr

or

alexandre.marcowith@umontpellier.fr

 

Références

A.R. Bell « Turbulent amplification of magnetic field and diffusive shock acceleration of Cosmic Rays »  MNRAS, 353, 550 (2004)

A.R. Bell « The interaction of Cosmic Rays and magnetized plasma » MNRAS, 358, 181 (2005)

  1. Marcowith « Cosmic-Ray-modified and driven instabilities » Cosmic Ray Astrophysics, Proceedings of the International School of Physics « Enrico Fermi », Course 208, Varenna, 24 – 29 June 2022, edited by F. Aharonian, E. Amato, and P. Blasi, ArXiv 2312.17134
  2. Yao et al. « Laboratory evidence for proton energization by collisionless shock surfing » Nat. Phys. 17, 1177 (2021)

 

For any inquiry please notify us at:
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