Benoît Labit

benoit.labit@epfl.ch +41 21 693 45 62

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Nationality: French, Swiss

EPFL SB SPC-TCV
PPB 118 (Bâtiment PPB)
Station 13
1015 Lausanne

+41 21 693 45 62
Office: PPB 118
EPFL › SB › SPC › SPC-TCV

Website: https://spc.epfl.ch/

+41 21 693 45 62
EPFL › VPA › VPA-AVP-DLE › AVP-DLE-EDOC › EDPY-ENS

Expertise

H-mode physics
Plasma turbulence
Experimental physics
Numerical simulations

Current work

Deputy Task Force Leader for the EUROfusion Workpackage "Tokamak Exploitation"

Biography Publications Teaching & PhD

PhD Thesis

Tokamak electron heat transport by direct numerical simulation of small scale turbulence
In a fusion machine, understanding plasma turbulence, which causes a degradation of the measured energy confinement time, would constitute a major progress in this field. In tokamaks, the measured ion and electron thermal conductivities are of comparable magnitude. The possible sources of turbulence are the temperature and density gradients occurring in a fusion plasma. Whereas the heat losses in the ion channel are reasonably well understood, the origin of the electron losses is more uncertain. In addition to the the radial velocity associated to the fluctuations of the electric field, electrons are more affected than ions by the magnetic field fluctuations. In experiments, the confinement time can be conveniently expressed in terms of dimensionless parameters. Although still somewhat too imprecise, these scaling laws exhibit strong dependencies on the normalized pressure, β or the normalized Larmor radius, Ï*.
The present thesis assesses whether a tridimensional, electromagnetic, nonlinear fluid model of plasma turbulence driven by a specific instability can reproduce the dependence of the experimental electron heat losses on the dimensionless parameters β and Ï*. The investigated interchange instability is the Electron Temperature Gradient driven one (ETG). The model is built by using the set of Braginskii equations. The developed simulation code is global in the sense that a fixed heat flux is imposed at the inner boundary, leaving the gradients free to evolve.
From the nonlinear simulations, we have put in light three characteristics for the ETG turbulence: the turbulent transport is essentially electrostatic; the potential and pressure fluctuations form radially elongated cells called streamers; the transport level is very low compared to the experimental values.
The thermal transport dependence study has shown a very small role of the normalized pressure, which is in contradiction with the Ohkawa

Education

Docteur es Sciences

| mention Rayonnement et Plasmas

2002 – 2002 Universitï¿½ de Provence Aix-Marseille I
Directed by Dr. M. Ottaviani et Dr. D. F. Escande

Professionals experiences

Collaborateur scientifique

2009–2009

EPFL

Post-doc

2003–2008

EPFL

Doctorant

1999–2002

CEA Cadarache (F)

201311

* Dynamics of the Fast-ion Acceleration in Type-i Elmy H-mode Scenarios on the Tcv Tokamak

J. Poley-Sanjuan; A. Jansen Van Vuuren; J. Galdon-Quiroga; S. Mazzi; M. Podesta et al.

NUCLEAR FUSION

2026

DOI : 10.1088/1741-4326/ae3a66

Benoît Labit

Expertise

Current work

PhD Thesis

Education

Docteur es Sciences

Professionals experiences

201311

* Dynamics of the Fast-ion Acceleration in Type-i Elmy H-mode Scenarios on the Tcv Tokamak

* Optimised 'hybrid' Scenario H-mode Plasmas for W Radiation Control in Jet with the Be/w Wall

* Model-based Estimation of Tokamak Plasma Profiles and Physics Parameters: Integration with Improved Equilibrium Reconstruction and Experimental Data

* The impact of neon seeding on pedestal performance and stability of JET-ILW deuterium H-mode discharges

* Milestone in predicting core plasma turbulence: successful multi-channel validation of the gyrokinetic code GENE

* Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade

* Isotope effects in linear and saturated ohmic confinement of TCV tokamak and gyrokinetic validation

* First measurements of velocity-space resolved intra-ELM fast-ion losses on the TCV tokamak

* Experimental characterization of inter-ELM modes in type-I ELMy scenarios at TCV using the thermal helium beam diagnostic

* Low Collisionality, Peeling Limited Pedestals in Jet-ilw: Effect of Density and Isotope Mass on Pedestal Structure, Pedestal Stability and Pedestal Prediction in Deuterium and Mixed Deuterium/tritium Plasmas

* Impact of the Plasma Boundary on Machine Operation and the Risk Mitigation Strategy on Jet

* Survey of the Edge Radial Electric Field in L-mode Tcv Plasmas Using Doppler Backscattering

* Progress in Pedestal and Edge Physics: Chapter 3 of the Special Issue: on the Path to Tokamak Burning Plasma Operation

* Overview of the third JET deuterium-tritium campaign

* L-H power threshold for neutral beam heated plasmas with Deuterium, Hydrogen, Helium and mixed ion species in TCV

* The quasi-continuous exhaust regime in ASDEX Upgrade and JET

* Modelling of ETG turbulent transport in the TCV pedestal

* The quasi-continuous exhaust regime in JET

* Effect of energetic ions on edge-localized modes in tokamak plasmas

* Observation of magnetic islands in tokamak plasmas during the suppression of edge-localized modes

* Overview of ASDEX upgrade results in view of ITER and DEMO

* Experimental research on the TCV tokamak

* Overview of T and D-T results in JET with ITER-like wall

* JET machine operations in T&amp;D-T

* Helium plasma operations on ASDEX Upgrade and JET in support of the non-nuclear phases of ITER

* Investigation of intrinsic error fields in MAST-U device

* Study of impurity C transport and plasma rotation in negative triangularity on the TCV tokamak

* The effect of plasma shaping on high density H-mode SOL profiles and fluctuations in TCV

* Progress in the development of the ITER baseline scenario in TCV

* ICRH assisted breakdown study on JET

* Analysis and expansion of the quasi-continuous exhaust (QCE) regime in ASDEX Upgrade

* Effect of the isotope mass on pedestal structure, transport and stability in D, D/T and T plasmas at similar β N and gas rate in JET-ILW type I ELMy H-modes

* Determination of MHD mode structures using soft x-ray diagnostics in TCV

* Improved heat and particle flux mitigation in high core confinement, baffled, alternative divertor configurations in the TCV tokamak

* Prospects of core–edge integrated no-ELM and small-ELM scenarios for future fusion devices

* Full conversion from ohmic to runaway electron driven current via massive gas injection in the TCV tokamak

* Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development

* Overview of the TCV tokamak experimental programme

* Quasicontinuous Exhaust Scenario for a Fusion Reactor: The Renaissance of Small Edge Localized Modes

* Enhanced confinement in diverted negative-triangularity L-mode plasmas in TCV

* Detachment in conventional and advanced double-null plasmas in TCV

* High resolution density pedestal measurements during edge localized modes by short-pulse reflectometry in the TCV tokamak

* Divertor closure effects on the TCV boundary plasma

* H-mode scrape-off layer power width in the TCV tokamak

* Pedestal structure, stability and scalings in JET-ILW: the EUROfusion JET-ILW pedestal database

* Impact of the new TCV baffled divertor upgrade on pedestal structure and performance

* Numerical investigation of optimal divertor gas baffle closure on TCV

* Nitrogen-seeded divertor detachment in TCV L-mode plasmas

* Scrape-off layer transport and filament characteristics in high-density tokamak regimes

* Overview of physics studies on ASDEX Upgrade

* Experimental implementation of a real-time power flux estimator for the ITER first wall on the TCV tokamak

* Status, scientific results and technical improvements of the NBH on TCV tokamak

* Langmuir probe electronics upgrade on the tokamak a configuration variable

* Role of the pedestal position on the pedestal performance in AUG, JET-ILW and TCV and implications for ITER

* Validation of the ICRF antenna coupling code RAPLICASOL against TOPICA and experiments

* ELM-induced cold pulse propagation in ASDEX Upgrade

* An improved understanding of the roles of atomic processes and power balance in divertor target ion current loss during detachment

* Physics research on the TCV tokamak facility: from conventional to alternative scenarios and beyond

* Real time magnetic control of the snowflake plasma configuration in the TCV tokamak

* Pedestal structure and energy confinement studies on TCV

* A locked mode indicator for disruption prediction on JET and ASDEX upgrade

* Application of a two-fluid two-point model to SolEdge2D-EIRENE simulations of TCV H-mode plasma

* A Variable Structure Control Scheme Proposal for the Tokamak a Configuration Variable

* The effect of the secondary x-point on the scrape-off layer transport in the TCV snowflake minus divertor

* Dependence of the L-Mode scrape-off layer power fall-off length on the upper triangularity in TCV

* Understanding and suppressing the near Scrape-Oﬀ Layer heat flux feature in inboard-limited plasmas in TCV

* X-point Position Dependence of Edge Intrinsic Toroidal Rotation on TCV

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

* Blob-induced toroidal momentum transport in simple magnetized plasmas

* Blob motion and control in simple magnetized plasmas

* "Snowflake" H Mode in a Tokamak Plasma

* Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device

* JET machine operations in T&D-T