Publications by Stefano Coda | EPFL Graph Search

Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER

Olivier Sauter, Stefano Coda, Timothy Goodman, Jonathan Graves, Costanza Zucca, Martin Jucker, Otto Asunta

13 MW of electron cyclotron current drive (ECCD) power deposited inside the q = 1 surface is likely to reduce the sawtooth period in ITER baseline scenario below the level empirically predicted to trigger neoclassical tearing modes (NTMs). However, since t ...

IOP2013

Power distribution in the snowflake divertor in TCV

Basil Duval, Stefano Coda, Holger Reimerdes, Benoît Labit, Federico Nespoli, Wouter Vijvers

TCV experiments demonstrate the basic power exhaust properties of the snowflake (SF) plus and SF minus divertor configurations by measuring the heat fluxes at each of their four divertor legs. The measurements indicate an enhanced transport into the privat ...

Iop Publishing Ltd2013

Observations on turbulence and beam-ion driven modes in TEXTOR

Stefano Coda, Mattia Albergante, Cornelis Adrianus de Meijere

At a sufficiently weak toroidal magnetic field, neutral beam injection heated, limited plasmas in the TEXTOR tokamak exhibit bursts of beam-ion driven 'fishbone' and Alfven modes, which are characterized for the first time using the multi-antenna reflectom ...

Iop Publishing Ltd2012

3rd harmonic ECRH absorption enhancement by 2nd harmonic heating at the same frequency in a tokamak

Stefano Coda, Timothy Goodman, Joan Decker, Silvano Gnesin

The fundamental mechanisms responsible for the interplay and synergy between the absorption dynamics of extraordinary-mode electron cyclotron waves at two different harmonic resonances (the 2nd and 3rd) are investigated in the TCV tokamak. An enhanced 3rd ...

2012

Development and validation of a tokamak skin effect transformer model

Stefano Coda, Jean-Marc Moret, Federico Alberto Alfredo Felici

A lumped parameter, state space model for a tokamak transformer including the slow flux penetration in the plasma (skin effect transformer model) is presented. The model does not require detailed or explicit information about plasma profiles or geometry. I ...

2012

Overview of Recent and Current Research on the TCV Tokamak

Stefano Coda

Through a diverse research programme, the Tokamak a Configuration Variable (TCV) addresses physics issues and develops tools for ITER and for the longer term goals of nuclear fusion, relying especially on its extreme plasma shaping and electron cyclotron r ...

Iop Publishing Ltd2012

Edge-localized mode control by electron cyclotron waves in a tokamak plasma

Olivier Sauter, Stefano Coda, Timothy Goodman, Yves Martin, Jean-Marc Moret, Duccio Testa, Federico Alberto Alfredo Felici, Jonathan Rossel

Electron cyclotron resonance heating is applied to the edge of a high-confinement (H-mode) plasma featuring type I edge-localized modes (ELMs) in the TCV tokamak. As the deposition location is shifted gradually in a highly controlled manner towards the pla ...

2012

Integrated real-time control of MHD instabilities using multi-beam ECRH/ECCD systems on TCV

Olivier Sauter, Basil Duval, Stefano Coda, Timothy Goodman, Federico Alberto Alfredo Felici, Jonathan Rossel

Simultaneous real-time control of multiple MHD instabilities is experimentally demonstrated in the TCV tokamak. Multiple sources of EC heating and current drive, injected through real-time controlled launchers, are used to stabilize 3/2 and 2/1 neoclassica ...

2012

Bifurcated Helical Core Equilibrium States in Tokamaks

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, David Pfefferlé, Federico David Halpern, Daniele Brunetti, Jonathan Rossel, Mattia Albergante

Tokamaks with weak to moderate reversed central shear in which the minimum rotational transform

q_{min}

is in the neighbourhood of unity can trigger bifurcated MagnetoHydrodynamic (MHD) equilibrium states, one of which is similar to a saturated ideal ...

2012

Rotation studies in electron Internal Transport Barriers on TCV

Olivier Sauter, Basil Duval, Stefano Coda, Alexander Karpushov, Yanis Andrebe, Lucia Isabel Federspiel

This paper reports simultaneous measurements of intrinsic toroidal and poloidal plasma rotation during the evolution of electron Internal Transport Barriers (eITBs) on TCV. A CXRS diagnostic-beam system provides ion parameter profiles for stationary pre-ba ...

2012

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Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER

Power distribution in the snowflake divertor in TCV

Observations on turbulence and beam-ion driven modes in TEXTOR

3rd harmonic ECRH absorption enhancement by 2nd harmonic heating at the same frequency in a tokamak

Development and validation of a tokamak skin effect transformer model

Overview of Recent and Current Research on the TCV Tokamak

Edge-localized mode control by electron cyclotron waves in a tokamak plasma

Integrated real-time control of MHD instabilities using multi-beam ECRH/ECCD systems on TCV

Bifurcated Helical Core Equilibrium States in Tokamaks

Rotation studies in electron Internal Transport Barriers on TCV

Observations on turbulence and beam-ion driven modes in TEXTOR

Rotation studies in electron Internal Transport Barriers on TCV

Overview of Recent and Current Research on the TCV Tokamak

Power distribution in the snowflake divertor in TCV

Development and validation of a tokamak skin effect transformer model

Integrated real-time control of MHD instabilities using multi-beam ECRH/ECCD systems on TCV

Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER

Bifurcated Helical Core Equilibrium States in Tokamaks

Edge-localized mode control by electron cyclotron waves in a tokamak plasma

3rd harmonic ECRH absorption enhancement by 2nd harmonic heating at the same frequency in a tokamak