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Stefano Coda

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Publications associées (367)

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

Timothy Goodman, Stefano Coda, Silvano Gnesin, Joan Decker

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

Helical core tokamak MHD equilibrium states

Wilfred Anthony Cooper, Basil Duval, Antoine Pochelon, Olivier Sauter, Holger Reimerdes, Stefano Coda, Jonathan Rossel, Jonathan Graves, Benoît Labit, Mattia Albergante

Bifurcated magnetohydrodynamic tokamak equilibrium states with axisymmetric or helical core structure are computed. When a peaked pressure profile is chosen, the helical core structures appear like the {em snakes} that are observed in the JET tokamak. They ...

Caroline Wilkinson2011

Progress and scientific results in the TCV tokamak

Stefano Coda

International Atomic Energy Agency2011

RF current drive and plasma fluctuations

Stefano Coda, Joan Decker

The role played by electron density fluctuations near the plasma edge on rf current drive in tokamaks is assessed quantitatively. For this purpose, a general framework for incorporating density fluctuations in existing modelling tools has been developed. I ...

Institute of Physics2011

Recent Advances in Sawtooth Control

Olivier Sauter, Stefano Coda, Jonathan Graves, James Paley

Important advances have been made recently in the invention and application of experimental methods to control the sawtooth instability in tokamak plasmas. The primary means of control involves the application of either ion cyclotron resonance heating (ICR ...

American Nuclear Society2011

Using APCS for Plasma Vertical Control at TCV

Basil Duval, Jean-Marc Moret, Stefano Coda, James Paley, Francesco Piras, Federico Alberto Alfredo Felici

Early tokamaks with circular cross-section plasmas were vertically stable in nature and no problems were reported on the control of the vertical position. However, the concept of vertically elongated plasma cross-section, with benefits to the energy confin ...

2011

Real-time physics-model-based simulation of the current density profile in tokamak plasmas

Basil Duval, Timothy Goodman, Jean-Marc Moret, Olivier Sauter, Stefano Coda, James Paley, Federico Alberto Alfredo Felici

A new paradigm is presented to reconstruct the plasma current density profile in a tokamak in real-time. The traditional method of basing the reconstruction on real-time diagnostics combined with a real-time Grad-Shafranov solver suffers from the difficult ...

IOP Publishing Ltd2011

A new sawtooth control mechanism relying on toroidally propagating ion cyclotron resonance frequency waves: Theory and Joint European Torus tokamak experimental evidence

Stefano Coda, Jonathan Graves

The sawtooth control mechanism in plasmas employing toroidally propagating ion cyclotron resonance waves is extended. The asymmetrically distributed energetic passing ions are shown to modify the ideal internal kink mode when the position of the minority i ...

APS2010

Experimental verification of sawtooth control by energetic particles in ion cyclotron resonance heated JET tokamak plasmas

Stefano Coda, Jonathan Graves

Experimental evidence from the JET tokamak is presented supporting the predictions of a recent theory (Graves et al 2009 Phys. Rev. Lett. 102 065005) on sawtooth instability control by toroidally propagating ion cyclotron resonance waves. Novel experimenta ...

IOP Publishing Ltd2010

Empirical scaling of sawtooth period for onset of neoclassical tearing modes

Olivier Sauter, Stefano Coda, Jonathan Graves

Experimental observations from a range of tokamaks show that neoclassical tearing modes (NTMs) are triggered at lower plasma pressure when the sawtooth period is longer. A multi-machine database from nine tokamaks has been established in order to extrapola ...

IOP Publishing Ltd2010

"Snowflake" H Mode in a Tokamak Plasma

Basil Duval, Jean-Marc Moret, Olivier Sauter, Stefano Coda, Benoît Labit, János Márki, Andreas Pitzschke, Francesco Piras

An edge-localized mode (ELM) H-mode regime, supported by electron cyclotron heating, has been successfully established in a snowflake (second-order null) divertor configuration for the first time in the TCV tokamak. This regime exhibits 2 to 3 times lowe ...

The American Physical Society2010

Snowflake divertor experiments on TCV

Basil Duval, Jean-Marc Moret, Olivier Sauter, Stefano Coda, Benoît Labit, János Márki, Andreas Pitzschke, Francesco Piras

An ELMy H-mode 'snowflake' (SF) divertor is established and studied for the first time in the TCV tokamak. The H-mode access and the edge localized mode (ELM) dynamics are compared with a conventional single-null diverted configuration. The SF configuratio ...

Institute of Physics2010

From sawtooth to profile control: developing feedback control using ECRH/ECCD systems on the TCV tokamak

Timothy Goodman, Stefano Coda, James Paley, Federico Alberto Alfredo Felici

Real time control of heating systems is essential to maximize plasma performance and avoid or neutralize instabilities under changing plasma conditions. Several feedback control algorithms have been developed on the Tokamak a Configuration Variable (TCV) t ...

Plasma Phys. Control. Fusion2009

The effect of plasma triangularity on turbulent transport:modelling TCV experiments by linear and non linear gyrokinetic simulations

Stephan Brunner, Antoine Pochelon, Olivier Sauter, Laurent Villard, Stefano Coda, Yann Camenen, Jonathan Graves, Alessandro Marinoni, Xavier Lapillonne

The effect of plasma shape on confinement has been experimentally explored in the TCV tokamak revealing that the core electron heat transport is significantly reduced by a negative triangularity configuration, which could indicate a (partial) stabilization ...

2009

Real time control of plasmas and ECRH systems on TCV

Basil Duval, Timothy Goodman, Yves Martin, Jean-Marc Moret, Stefano Coda, James Paley, Francesco Piras, Federico Alberto Alfredo Felici

Developments in the real time control hardware on Tokamak à Configuration Variable (TCV) coupled with the flexibility of plasma shaping and electron cyclotron (EC) heating and current drive actuators are opening many opportunities to perform real time expe ...

IOP Publishing Ltd2009

Current density evolution in electron internal transport barrier discharges in TCV

Timothy Goodman, Olivier Sauter, Stefano Coda, Emiliano Fable, Costanza Zucca

Simulations of the plasma current density evolution in electron internal transport barrier discharges on the Tokamak a Configuration Variable (TCV) have been performed, in order to determine the relationship between the safety-factor profile and the electr ...

2009

Sawtooth-Control Mechanism using Toroidally Propagating Ion-Cyclotron-ResonanceWaves in Tokamaks

Stefano Coda, Jonathan Graves

The sawtooth control mechanism in plasmas employing off-axis toroidally propagating ion cyclotron resonance waves in tokamaks is reinvestigated. The radial drift excursion of energetic passing ions distributed asymmetrically in the velocity parallel to the ...

American Physical Society2009

Real time control of the sawtooth period using EC launchers

Timothy Goodman, Stefano Coda, James Paley, Francesco Piras, Federico Alberto Alfredo Felici

Tokamak plasmas operating at high performance are limited by several MHD instabilities. The sawtooth instability limits the core plasma pressure and can drive the neoclassical tearing mode unstable, but also prevents accumulation of impurities in the core. ...

Plasma Phys. Control. Fusion2009

Suprathermal electron studies in the TCV tokamak: Design of a tomographic hard-x-ray spectrometer

Stefano Coda, Silvano Gnesin, Joan Decker

2008

Nonthermal electron Bernstein emission in NSTX-like discharges

Stefano Coda, Anton Smirnov

2008

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