Benoît Labit
EPFL SB SPC-TCV
PPB 118 (Bâtiment PPB)
Station 13
1015 Lausanne
Web site: Web site: https://spc.epfl.ch/
EPFL > VPA-AVP-PGE > AVP-PGE-EDOC > EDPY-ENS
Fields of expertise
Plasma turbulence
Experimental physics
Numerical simulations
Current work
Deputy Task Force Leader for the EUROfusion Workpackage "Tokamak Exploitation"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, ρ*.
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 ρ*. 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
Universit� de Provence Aix-Marseille I
22.10.2002
Licence et Maitrise de Physique
Universit� Paul Sabatier Toulouse III
Publications
Infoscience publications
201311
* Study of impurity C transport and plasma rotation in negative triangularity on the TCV tokamak
Plasma Physics And Controlled Fusion
2024-07-01
DOI : 10.1088/1361-6587/ad5229
* The effect of plasma shaping on high density H-mode SOL profiles and fluctuations in TCV
Nuclear Fusion
2024-02-01
DOI : 10.1088/1741-4326/ad1a56
* Progress in the development of the ITER baseline scenario in TCV
Plasma Physics and Controlled Fusion
2024
DOI : 10.1088/1361-6587/ad1a40
* 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
Nuclear Fusion
2023
DOI : 10.1088/1741-4326/acf057
* ICRH assisted breakdown study on JET
Plasma Physics And Controlled Fusion
2023-09-01
DOI : 10.1088/1361-6587/ace6d2
* Analysis and expansion of the quasi-continuous exhaust (QCE) regime in ASDEX Upgrade
Nuclear Fusion
2023-07-01
DOI : 10.1088/1741-4326/acd464
* Determination of MHD mode structures using soft x-ray diagnostics in TCV
Plasma Physics and Controlled Fusion
2023
DOI : 10.1088/1361-6587/acb0fe
* Overview of the TCV tokamak experimental programme
Nuclear Fusion
2022-04-01
DOI : 10.1088/1741-4326/ac369b
* Improved heat and particle flux mitigation in high core confinement, baffled, alternative divertor configurations in the TCV tokamak
Nuclear Fusion
2022-12-01
DOI : 10.1088/1741-4326/ac94e5
* Prospects of core–edge integrated no-ELM and small-ELM scenarios for future fusion devices
Nuclear Materials and Energy
2022-11-22
DOI : 10.1016/j.nme.2022.101308
* Quasicontinuous Exhaust Scenario for a Fusion Reactor: The Renaissance of Small Edge Localized Modes
Physical Review Letters
2022
DOI : 10.1103/PhysRevLett.129.165001
* Full conversion from ohmic to runaway electron driven current via massive gas injection in the TCV tokamak
Nuclear Fusion
2022-07-01
DOI : 10.1088/1741-4326/ac544e
* Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development
Nuclear Fusion
2022-04-01
DOI : 10.1088/1741-4326/ac207f
* Enhanced confinement in diverted negative-triangularity L-mode plasmas in TCV
Plasma Physics And Controlled Fusion
2022-01-01
DOI : 10.1088/1361-6587/ac3fec
* Detachment in conventional and advanced double-null plasmas in TCV
Nuclear Fusion
2021-11-01
DOI : 10.1088/1741-4326/ac27c6
* Divertor closure effects on the TCV boundary plasma
Nuclear Materials And Energy
2021-06-01
DOI : 10.1016/j.nme.2021.100977
* High resolution density pedestal measurements during edge localized modes by short-pulse reflectometry in the TCV tokamak
Plasma Physics and Controlled Fusion
2021-06-03
DOI : 10.1088/1361-6587/ac0797
* Impact of the new TCV baffled divertor upgrade on pedestal structure and performance
Nuclear Materials and Energy
2021
DOI : 10.1016/j.nme.2021.100933
* H-mode scrape-off layer power width in the TCV tokamak
Nuclear Fusion
2021-02-01
DOI : 10.1088/1741-4326/abd147
* Pedestal structure, stability and scalings in JET-ILW: the EUROfusion JET-ILW pedestal database
Nuclear Fusion
2021
DOI : 10.1088/1741-4326/abb79e
* Numerical investigation of optimal divertor gas baffle closure on TCV
Plasma Physics And Controlled Fusion
2020-11-01
DOI : 10.1088/1361-6587/abb24f
* Scrape-off layer transport and filament characteristics in high-density tokamak regimes
Nuclear Fusion
2020-01-01
DOI : 10.1088/1741-4326/ab423e
* Nitrogen-seeded divertor detachment in TCV L-mode plasmas
Plasma Physics And Controlled Fusion
2020-03-01
DOI : 10.1088/1361-6587/ab6b00
* Scrape Off Layer (SOL) transport and filamentary characteristics in high density tokamak regimes
Nuclear Fusion
2020
DOI : 10.1088/1741-4326/ab423e
* Status, scientific results and technical improvements of the NBH on TCV tokamak
Fusion Engineering And Design
2019-09-01
DOI : 10.1016/j.fusengdes.2019.01.077
* Role of the pedestal position on the pedestal performance in AUG, JET-ILW and TCV and implications for ITER
Nuclear Fusion
2019-07-01
DOI : 10.1088/1741-4326/ab1eb9
* Validation of the ICRF antenna coupling code RAPLICASOL against TOPICA and experiments
Nuclear Fusion
2019-04-01
DOI : 10.1088/1741-4326/aaf455
* ELM-induced cold pulse propagation in ASDEX Upgrade
Plasma Physics And Controlled Fusion
2019-04-01
DOI : 10.1088/1361-6587/aaf9c3
* Overview of physics studies on ASDEX Upgrade
Nuclear Fusion
2019-11-01
DOI : 10.1088/1741-4326/ab18b8
* Experimental implementation of a real-time power flux estimator for the ITER first wall on the TCV tokamak
Fusion Engineering And Design
2019-10-01
DOI : 10.1016/j.fusengdes.2019.111242
* Langmuir probe electronics upgrade on the tokamak a configuration variable
Review Of Scientific Instruments
2019-08-01
DOI : 10.1063/1.5108876
* Real time magnetic control of the snowflake plasma configuration in the TCV tokamak
Nuclear Fusion
2019
DOI : 10.1088/1741-4326/ab4440
* An improved understanding of the roles of atomic processes and power balance in divertor target ion current loss during detachment
Nuclear Fusion
2019
DOI : 10.1088/1741-4326/ab4251
* Physics research on the TCV tokamak facility: from conventional to alternative scenarios and beyond
Nuclear Fusion
2019
DOI : 10.1088/1741-4326/ab25cb
* A locked mode indicator for disruption prediction on JET and ASDEX upgrade
Fusion Engineering And Design
2019-01-01
DOI : 10.1016/j.fusengdes.2018.11.021
* A Variable Structure Control Scheme Proposal for the Tokamak a Configuration Variable
Complexity
2019-01-01
DOI : 10.1155/2019/2319560
* Progress toward divertor detachment on TCV within H-mode operating parameters
Plasma Physics and Controlled Fusion
2019
DOI : 10.1088/1361-6587/ab140e
* Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade
Nuclear Fusion
2019
DOI : 10.1088/1741-4326/ab2211
* Application of a two-fluid two-point model to SolEdge2D-EIRENE simulations of TCV H-mode plasma
Nuclear Materials and Energy
2019
DOI : 10.1016/j.nme.2018.11.026
* Millimeter-wave beam scattering by edge-plasma density fluctuations in TCV
Plasma Physics and Controlled Fusion
2019
DOI : 10.1088/1361-6587/aae7bf
* Pedestal structure and energy confinement studies on TCV
Plasma Physics And Controlled Fusion
2019-01-01
DOI : 10.1088/1361-6587/aae7bd
* Conduction-based model of the Scrape-Off Layer power sharing between inner and outer divertor in diverted low-density tokamak plasmas
Nuclear Materials and Energy
2019-03-22
DOI : 10.1016/j.nme.2019.03.020
* The effect of the secondary x-point on the scrape-off layer transport in the TCV snowflake minus divertor
Nuclear Fusion
2018-12-05
DOI : 10.1088/1741-4326/aaee1b
* Disruption avoidance through the prevention of NTM destabilization in TCV
Nuclear Fusion
2018
DOI : 10.1088/1741-4326/aad924
* Parameter dependences of small edge localized modes (ELMs)
Nuclear Fusion
2018
DOI : 10.1088/1741-4326/aad757
* Fluctuation characteristics of the TCV snowflake divertor measured with high speed visible imaging
Plasma Physics and Controlled Fusion
2018
DOI : 10.1088/1361-6587/aae005
* Filamentary velocity scaling validation in the TCV tokamak
Physics of Plasmas
2018
DOI : 10.1063/1.5038019
* Impurity seeding for suppression of the near scrape-off layer heat flux feature in tokamak limited plasmas
Physics of Plasmas
2018
DOI : 10.1063/1.5023201
* Analysis of wall-embedded Langmuir probe signals in different conditions on the Tokamak à Configuration Variable
Review of Scientific Instruments
2018
DOI : 10.1063/1.5022459
* Dependence of the L-Mode scrape-off layer power fall-off length on the upper triangularity in TCV
Plasma Physics and Controlled Fusion
2018
DOI : 10.1088/1361-6587/aaaef7
* Experimental observations of modes with geodesic acoustic character from the core to the edge in the TCV tokamak
Plasma Physics and Controlled Fusion
2018
DOI : 10.1088/1361-6587/aaa71d
* Divertor power load studies for attached L-mode single-null plasmas in TCV
Nuclear Fusion
2018
DOI : 10.1088/1741-4326/aa986b
* Detachment evolution on the TCV tokamak
Nuclear Materials and Energy
2017
DOI : 10.1016/j.nme.2016.10.020
* TCV experiments towards the development of a plasma exhaust solution
Nuclear Fusion
2017
DOI : 10.1088/1741-4326/aa82c2
* TCV divertor upgrade for alternative magnetic configurations
Nuclear Materials And Energy
2017
DOI : 10.1016/j.nme.2017.02.013
* Effect of plasma geometry on divertor heat flux spreading: MONALISA simulations and experimental results from TCV
Nuclear Materials And Energy
2017
DOI : 10.1016/j.nme.2016.10.003
* Overview of progress in European medium sized tokamaks towards an integrated plasma-edge/wall solution
Nuclear Fusion
2017
DOI : 10.1088/1741-4326/aa6084
* Modification of SOL profiles and fluctuations with line-average density and divertor flux expansion in TCV
Nuclear Fusion
2017
DOI : 10.1088/1741-4326/aa7db3
* Exploring drift effects in TCV single-null plasmas with the UEDGE code
Plasma Physics and Controlled Fusion
2017
DOI : 10.1088/1361-6587/aa7c8e
* Understanding and suppressing the near Scrape-Off Layer heat flux feature in inboard-limited plasmas in TCV
Nuclear Fusion
2017
DOI : 10.1088/1741-4326/aa84e0
* Spectroscopic investigations of divertor detachment in TCV
Nuclear Materials and Energy
2017
DOI : 10.1016/j.nme.2017.01.004
* Poloidal asymmetry in the narrow heat flux feature in the TCV scrape-off layer
Physics of Plasmas
2017
DOI : 10.1063/1.4985075
* Overview of the TCV tokamak program: scientific progress and facility upgrades
Nuclear Fusion
2017
DOI : 10.1088/1741-4326/aa6412
* Blob properties in full-turbulence simulations of the TCV scrape-off layer
Plasma Physics and Controlled Fusion
2017
DOI : 10.1088/1361-6587/aa6276
* Results from recent detachment experiments in alternative divertor configurations on TCV
Nuclear Fusion
2017
DOI : 10.1088/1741-4326/aa5fb7
* Numerical study of potential heat flux mitigation effects in the TCV snowflake divertor
Plasma Physics And Controlled Fusion
2016
DOI : 10.1088/0741-3335/58/4/045027
* Enhanced (E)over-right-arrow x (B)over-right-arrow drift effects in the TCV snowflake divertor
Nuclear Fusion
2015
DOI : 10.1088/0029-5515/55/12/123023
* X-Point-Position-Dependent Intrinsic Toroidal Rotation in the Edge of TCV
Physical Review Letters
2015
DOI : 10.1103/PhysRevLett.114.245001
* X-point Position Dependence of Edge Intrinsic Toroidal Rotation on TCV
Physics of Plasmas
2015
DOI : 10.1063/1.4921158
* Plasma turbulence, suprathermal ion dynamics and code validation on the basic plasma physics device TORPEX
Journal Of Plasma Physics
2015
DOI : 10.1017/S0022377815000161
* Impact of a narrow limiter SOL heat flux channel on the ITER first wall panel shaping
Nuclear Fusion
2015
DOI : 10.1088/0029-5515/55/3/033019
* High density experiments in TCV ohmically heated and L-mode plasmas
Plasma Physics and Controlled Fusion
2015
DOI : 10.1088/0741-3335/57/2/025002
* Threshold power for the transition into H-mode for H, D, and He plasmas in TCV
Plasma Physics and Controlled Fusion
2015
DOI : 10.1088/0741-3335/57/2/025007
* Power exhaust in the snowflake divertor for L- and H-mode TCV tokamak plasmas
Nuclear Fusion
2014
DOI : 10.1088/0029-5515/54/2/023009
* First EMC3-Eirene simulations of the TCV snowflake divertor
Plasma Physics and Controlled Fusion
2014
DOI : 10.1088/0741-3335/56/3/035009
* Theory-based scaling of the SOL width in circular limited tokamak plasmas
Nuclear Fusion
2013
DOI : 10.1088/0029-5515/53/12/122001
* Plasma radiation dynamics with the upgraded Absolute Extreme Ultraviolet tomographical system in the Tokamak a Configuration Variable
Review Of Scientific Instruments
2013
DOI : 10.1063/1.4848155
* Bifurcated Helical Core Equilibrium States in Tokamaks
Nuclear Fusion
2013
DOI : 10.1088/0029-5515/53/7/073021
* Recent TCV results – innovative plasma shaping to improve plasma properties and insight
Plasma and Fusion Research
2012
DOI : 10.1585/pfr.7.2502148
* Dependence of L-mode confinement on the electron cyclotron power deposition profile in the TCV tokamak
Plasma Physics and Controlled Fusion
2012
DOI : 10.1088/0741-3335/54/1/015011
* Three-Dimensional Imaging of a Radially Propagating Plasma Blob Using Conditional Sampling Techniques
IEEE Transactions on Plasma Science
2011
DOI : 10.1109/TPS.2011.2162254
* Blob motion and control in simple magnetized plasmas
Physics of Plasmas
2011
DOI : 10.1063/1.3562944
* Blob-induced toroidal momentum transport in simple magnetized plasmas
Physics of Plasmas
2011
DOI : 10.1063/1.3559462
* Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device
Plasma Physics and Controlled Fusion
2010
DOI : 10.1088/0741-3335/52/12/124020
* "Snowflake" H Mode in a Tokamak Plasma
Physical Review Letters
2010
DOI : 10.1103/PhysRevLett.105.155003
* Observation of a critical pressure gradient for the stabilization of interchange modes in simple magnetized toroidal plasmas
Physics of Plasmas
2009
DOI : 10.1063/1.3204704
* Cross-field plasma blob motion in an open magnetic field line configuration
Physical Review Letters
2009
DOI : 10.1103/PhysRevLett.103.065001
* Langmuir probe-based observables for plasma-turbulence code validation and application to the TORPEX basic plasma physics experiment
Physics of Plasmas
2009
DOI : 10.1063/1.3082698
* Cross-field transport by instabilities and blobs in a magnetized toroidal plasma
Physical Review Letters
2008
DOI : 10.1103/PhysRevLett.101.045001
* Two-dimensional time resolved measurements of toroidal velocity correlated with density blobs in magnetized plasmas
Review of Scientific Instruments
2008
DOI : 10.1063/1.2965141
* Dynamics of plasma blobs in a shear flow
Physical Review Letters
2008
DOI : 10.1103/PhysRevLett.101.115005
* The role of the density gradient on intermittent cross-field transport events in a simple magnetized toroidal plasma
Physics of Plasmas
2008
DOI : 10.1063/1.2901188
* Experimental Observation of the Blob-Generation Mechanism from InterchangeWaves in a Plasma
Physical Review Letters
2008
DOI : 10.1103/PhysRevLett.100.055004
* Plasma blobs in a basic toroidal experiment: Origin, dynamics, and induced transport
Physics of Plasmas
2007
DOI : 10.1063/1.2813193
* Antenna excitation of drift wave in a toroidal plasma
Physics of Plasmas
2007
DOI : 10.1063/1.2784464
* Statistical properties of electrostatic turbulence in toroidal magnetized plasmas
Plasma Physics and Controlled Fusion
2007
DOI : 10.1088/0741-3335/49/12B/S26
* Universal statistical properties of drift-interchange turbulence in TORPEX plasmas
Physical Review Letters
2007
DOI : 10.1103/PhysRevLett.98.255002
* Comparison between fluid electron-temperature-gradient driven simulations and Tore Supra experiments on electron heat transport
Journal of Plasma Physics
2007
DOI : 10.1017/S0022377806004466
* Characterization of the electron distribution function in an electron-cyclotron driven toroidal plasma
Plasma Physics and Controlled Fusion
2007
DOI : 10.1088/0741-3335/49/2/007
* Electrostatic turbulence and transport in a simple magnetized plasma
Physics of Plasmas
2006
DOI : 10.1063/1.2178773
* Probabilistic analysis of turbulent structures from two-dimensional plasma imaging
Physics of Plasmas
2006
DOI : 10.1063/1.2351960
* Fast ion source and detector for investigating the interaction of turbulence with suprathermal ions in a low temperature toroidal plasma - art. no. 10F503
Review of Scientific Instruments
2006
DOI : 10.1063/1.2219407
* Experimental characterization and modelling of the particle source in an Electron-Cyclotron wave driven toroidal plasma
Plasma Physics and Controlled Fusion
2006
DOI : 10.1088/0741-3335/48/8/001
* Experimental characterization of drift-interchange instabilities in a simple toroidal plasma
Physics of Plasmas
2006
DOI : 10.1063/1.2356483
* Basic turbulence studies on TORPEX and challenges in the theory-experiment comparison
Physics of Plasmas
2005
DOI : 10.1063/1.2034367
* Plasma production by low-field side injection of electron cyclotron waves in a simple magnetized torus
Plasma Physics and Controlled Fusion
2005
DOI : 10.1088/0741-3335/47/11/008
* Effects of a vertical magnetic field on particle confinement in a magnetized plasma torus
Physical Review Letters
2004
DOI : 10.1103/PhysRevLett.93.165003