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Basil Duval

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Related publications (369)

Fast seeding of NTMs by sawtooth crashes in TCV and their preemption using ECRH

Basil Duval, Timothy Goodman, Antoine Pochelon, Olivier Sauter, Holger Reimerdes, Jonathan Graves, Duccio Testa

Many tokamaks have observed that sawteeth of sufficient duration may trigger neoclassical tearing modes (NTMs) that lead to plasma performance degradation. In this paper, TCV's ability to accurately control the period of individual sawteeth is exploited, u ...

IOP Publishing Ltd2013

Real-time control of the period of individual ELMs by EC power on TCV

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

The period of individual type-I edge-localized modes (ELMs) in TCV H-mode plasmas is controlled by real-time controlled application of electron cyclotron (EC) power close to the plasma pedestal. An ELM pacing algorithm, closely related to sawtooth pacing [ ...

IOP Publishing Ltd2013

Plasma radiation dynamics with the upgraded Absolute Extreme Ultraviolet tomographical system in the Tokamak a Configuration Variable

René Chavan, Basil Duval, Benoît Labit

We introduce an upgraded version of a tomographical system which is built up from Absolute Extreme Ultraviolet-type (AXUV) detectors and has been installed on the Tokamak a Configuration Variable (TCV). The system is suitable for the investigation of fast ...

Amer Inst Physics2013

Power distribution in the snowflake divertor in TCV

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

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

Indirect measurement of poloidal rotation using inboard–outboard asymmetry of toroidal rotation and comparison with neoclassical predictions

Basil Duval, Olivier Sauter, Alexander Karpushov, Yanis Andrebe, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon

An alternative experimental spectroscopic measurement of poloidal plasma rotation in toroidally confined plasmas is proven effective in the TCV tokamak. Charge exchange recombination measurements of the toroidal rotation profile over the full mid-plane pla ...

Int Atomic Energy Agency2012

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

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

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 ...

IOP Publishing Ltd2012

Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas

Basil Duval

Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coin ...

American Institute of Physics (AIP)2012

Bifurcated Helical Core Equilibrium States in Tokamaks

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

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

Electron temperature and density profile evolution during the ELM cycle in ohmic and EC-heated H-mode plasmas in TCV

Roland Behn, Basil Duval, Olivier Sauter, Laurent Villard, Laurie Porte, János Márki, Andreas Pitzschke

2012

Dependence of L-mode confinement on the electron cyclotron power deposition profile in the TCV tokamak

Roland Behn, Basil Duval, Timothy Goodman, Antoine Pochelon, Olivier Sauter, Stefano Coda, Alexander Karpushov, Loïc Curchod, Benoît Labit, Mikael Rancic

Institute of Physics2012

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

Stephan Brunner, Basil Duval, Timothy Goodman, Jean-Marc Moret, Antoine Pochelon, Olivier Sauter, Laurent Villard, Holger Reimerdes, Stefano Coda, Alberto Bottino, Sébastien Jolliet, Jonathan Rossel, Alexander Karpushov, Laurie Porte, Paolo Angelino, Benoît Labit, Alessandro Marinoni, Mikael Rancic, Andreas Pitzschke, Dávid Wágner, David Nicholas Wagner

2012

Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L-Mode Plasmas

Basil Duval

Direction reversals of intrinsic toroidal rotation have been observed in diverted Alcator C-Mod Ohmic L-mode plasmas following electron density ramps. For low density discharges, the core rotation is directed cocurrent, and reverses to countercurrent follo ...

2011

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

Observations of core toroidal rotation reversals in Alcator C-Mod ohmic L-mode plasmas

Basil Duval, Alessandro Bortolon

Direction reversals of intrinsic toroidal rotation have been observed in Alcator C-Mod ohmic L-mode plasmas following modest electron density or toroidal magnetic field ramps. The reversal process occurs in the plasma interior, inside of the q = 3/2 surfac ...

IOP Publishing Ltd2011

A scoping study of the application of neutral beam heating on the TCV tokamak

René Chavan, Basil Duval, Olivier Sauter, Henri Weisen, Alexander Karpushov, Emiliano Fable

The TCV tokamak contributes to the physics understanding of fusion plasmas, broadening the parameter range of reactor relevant regimes, by investigations based on an extensive use of the existing main experimental tools: flexible shaping and high power rea ...

Elsevier B.V.2011

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

Overview of toroidal momentum transport

Basil Duval, Yann Camenen, Alessandro Bortolon, Giovanni Tardini

Toroidal momentum transport mechanisms are reviewed and put in a broader perspective. The generation of a finite momentum flux is closely related to the breaking of symmetry (parity) along the field. The symmetry argument allows for the systematic identifi ...

IOP Publishing Ltd2011

Use of webcams as tools for alignment and supervision of a Thomson Scattering System in the near infrared

Roland Behn, Basil Duval, Pierre Etienne, Yanis Andrebe, Andreas Pitzschke

The alignment stability is a major concern for Thomson scattering systems. Even small angular deviations of the laser beams crossing the plasma lead to a loss of the calibration resulting in unreliable measurements of the electron density profile. For the ...

Fusion Engineering and Design2010

Experimental demonstration of an up-down asymmetry effect on intrinsic rotation in the TCV tokamak

Basil Duval, Olivier Sauter, Alexander Karpushov, Yann Camenen, Lucia Isabel Federspiel, Alessandro Bortolon, Francesco Piras

A new mechanism has recently been proposed that generates a radial flux of parallel momentum in toroidal plasmas. Namely, by considering up-down asymmetric flux surfaces, the symmetry following the magnetic field can be broken and an additional contributio ...

Institute of Physics2010

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