Publications de Sébastien Jolliet

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Turbulent transport dynamics and level are investigated with the 5D gyrokinetic global code GYSELA, modelling the Ion Temperature Gradient instability with adiabatic electrons. The heat transport exhibits large scale events, propagating radially in both directions at velocities of the order of the diamagnetic velocity. The effective diffusivity is in agreement with that reported in other gyrokinetic codes such as ORB5. Transition from Bohm to gyroBohm scaling is observed on the turbulence correlation length

In global gyrokinetic simulations it takes a long time for the turbulence to reach a quasisteady state, and quantitative predictions about the quasisteady state turbulence have been difficult to obtain computationally. In particular, global particle-in-cel ...

Fluctuating quantities in magnetic confinement geometries often inherit a strong anisotropy along the field lines. One technique for describing these structures is the use of a certain set of Fourier components on the tori of nested flux surfaces. We descr ...

Nonlinear electrostatic global gyrokinetic simulations of collisionless ion temperature gradient (ITG) turbulence and ExB zonal flows in axisymmetric toroidal plasmas are examined for different choices of the initial distribution function. Using a local Ma ...

The scaling of turbulence-driven heat transport with system size in magnetically confined plasmas is reexamined using first-principles based numerical simulations. Two very different numerical methods are applied to this problem, in order to resolve a long ...

This paper presents the current state of the global gyrokinetic code Orb5 as an update of the previous reference (Jolliet et al., 2007). The Orb5 code solves the electromagnetic Vlasov–Maxwell system of equations using a PIC scheme and also includes collis ...

Bridging the gap between plasma physics and other scientific domains, in particular, the computational fluid dynamics community, a general, rigorous, and simple-to-apply methodology is presented for both the verification of the correct implementation of th ...

In the context of gyrokinetic flux-tube simulations of microturbulence in magnetized toroidal plasmas, different treatments of the magnetic equilibrium are examined. Considering the Cyclone DIII-D base case parameter set [Dimits et al., Phys. Plasmas 7, 96 ...

In this Letter, it is shown that global, nonlinear, particle-in-cell (PIC) simulations of electron temperature driven turbulence recover the same level of transport as flux-tube codes when the level of statistical noise, associated with the PIC discretizat ...

In this paper, the influence of the parallel nonlinearity on zonal flows and heat transport in global particle-in-cell ion-temperature-gradient simulations is studied. Although this term is in theory orders of magnitude smaller than the others, several aut ...

Sébastien Jolliet

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Global gyrokinetic simulations of rho* and nu* scalings of turbulent transport

Long global gyrokinetic simulations: Source terms and particle noise control

Rapid Fourier space solution of linear partial differential equations in toroidal magnetic confinement geometries

On the definition of a kinetic equilibrium in global gyrokinetic simulations

System size effects on gyrokinetic turbulence

Orb5: A global electromagnetic gyrokinetic code using the PIC approach in toroidal geometry

Verification methodology for plasma simulations and application to a scrape-off layer turbulence code

Effects of plasma current on nonlinerar interactions of ITG turbulence, zonal flows and geodesic acoustic modes

Clarifications to the limitations of the s-alpha equilibrium model for gyrokinetic computations of turbulence

The role of plasma elongation on the linear damping of zonal flows

Nonlinear low noise particle-in-cell simulations of electron temperature gradient driven turbulence

The European turbulence code benchmarking effort: turbulence driven by thermal gradients in magnetically confined plasmas

Influence of the parallel nonlinearity on zonal flows and heat transport in global gyrokinetic particle-in-cell simulations

Gyrokinetic particle simulations of ITG modes and zonal flows with canonical and local equilibrium distributions

Benchmark of a semi-Lagrangian and a Lagrangian code for gyrokinetic simulations

Plasma Shape Effects on Geodesic Acoustic Oscillations

Noise control in global gyrokinetic particle simulations

Recent TCV results – innovative plasma shaping to improve plasma properties and insight

Recent advances in non-linear PIC simulaions in magnetic coordinates

Ion and Electron Dynamics in Nonlinear PIC simulations