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Reference : UMR7345-ERIROS-021
Workplace : MARSEILLE 13
Date of publication : Wednesday, January 12, 2022
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 April 2022
Proportion of work : Full time
Remuneration : between 2743,70 € and 3896,73 € gross monthly depending on experience
Desired level of education : PhD
Experience required : 1 to 4 years
The mission will consist in a modeling work, with the aim of contributing to a better understanding of the behaviour of energetic particles modes in tokamak plasmas, a key element in the operation of future magnetic confinement fusion reactors.
Understanding the transport and losses of energetic particles in Tokamaks is crucial for operating future fusion reactors. Indeed, energetic particles can resonate with eigenmodes of the thermal plasma and, via this interaction, be expelled before being able to deposit their energy in the Tokamak core, and maintaining their proper high-temperature conditions for having Fusion reactions.
In particular, trapped energetic particles resonate with the low-frequency kink mode, leading to a growing ''Fishbone'' instability. These particles can be generated by heating systems in D-D experiments, or can correspond to the population of Alpha particles with a velocity mainly perpendicular to the ambient magnetic field, in D-T experiments.
The future researcher will investigate the dynamics of the Fishbone instability, and that of particles, with the aid of two different numerical codes, and experimental data from the D-T campaign of JET. The two codes are complementary. The first one (BAK-RM) adopts a simplified model, where the thermal plasma is described using reduced MHD, coupled to the dynamics of deeply trapped energetic particles only, described by a gyro- and bounce-averaged Vlasov equation. This code is developed at the PIIM laboratory and has the great advantage of selecting only part of the complex physics determining the Fishbone dynamics, in a simplified geometry. The second code (XTOR-K), developed by H. Lütjens at the CPHT laboratory (Palaiseau), provides a more complete description where full MHD equations describe the thermal plasma while trapped and passing energetic particles are treated kinetically in the full 3D3V phase-space.
The numerical results will be compared to the experimental data of the recent D-T campaign of JET, in collaboration with R. Dumont (IRFM, CEA Cadarache).
The combined action of a reduced model, a more realistic one and experimental measurements, have the aim of understanding the mode dynamics, in particular during its nonlinear phase, and its impact on energetic particle radial transport.
Keywords : Plasma Physics, Magnetically Confinment Fusion, Numerical simulations, Energetic particles in Tokamaks
• Plasma physics
• Numerical simulations and Data analysis
• Adaptability, Teamwork, Communication skills, Autonomy
The PIIM laboratory has been an important player in the physics of magnetic confinement fusion machines (MFC) since the 1990s. Its activities are strongly integrated at the regional, national (with the research federation FR-FCM) and European (Eurofusion) levels. The person recruited will join the new "Théorie Modélisation Plasmas" (TMP) team which is under the responsibility of Dr. Olivier Agullo. The contract researcher will work under the scientific responsibility of Dr. Matteo Faganello
Constraints and risks
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