Publications by Petri Nikkola | EPFL Graph Search

Shear modulation experiments with ECCD on TCV

Timothy Goodman, Stefano Alberti, Roland Behn, Petri Nikkola

Anomalous electron transport is determined by turbulence, which in turn is affected by magnetic shear. A novel application of electron cyclotron current drive (ECCD), aiming at localized shear modulation, has been applied on the TCV tokamak for experiments ...

IOP Publishing Ltd2006

Safety factor profile requirements for electron ITB formation in TCV

Olivier Sauter, Ambrogio Fasoli, Basil Duval, Stefano Coda, Timothy Goodman, Yves Martin, Jean-Marc Moret, Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge

On the Tokamak a Configuration Variable (TCV), electron internal transport barriers (eITBs) can be formed during a gradual evolution from a centrally peaked to a hollow current profile while all external actuators are held constant. The formation occurs ra ...

2005

Influence of non-Maxwellian velocity distributions during ECRH and ECCD on electron temperature measurements by Thomson scattering

Olivier Sauter, Roland Behn, Igor Klimanov, Petri Nikkola

Deposition of electron cyclotron waves at high-power densities for heating and current drive in a tokamak plasma generates a population of fast electrons and therefore the velocity distribution of the electron population will deviate from a Maxwellian. Apa ...

2005

Control of the eITB formation and performance in fully non-inductively sustained ECCD discharges in TCV

Olivier Sauter, Stefano Coda, Timothy Goodman, Antoine Pochelon, Yann Camenen, Roland Behn, Alberto Bottino, Emiliano Fable, Costanza Zucca, Petri Nikkola

2005

Inductive current density perturbations to probe electron internal transport barriers in tokamaks

Olivier Sauter, Stefano Coda, Timothy Goodman, Roland Behn, Alberto Bottino, Emiliano Fable, Costanza Zucca, Andrei Martynov, Petri Nikkola

Improved electron energy confinement in tokamak plasmas, related to internal transport barriers, has been linked to nonmonotonic current density profiles. This is difficult to prove experimentally since usually the current profiles evolve continuously and ...

2005

The physics performance of the front steering launcher for the ITER ECRH upper port

Olivier Sauter, René Chavan, Francisco Sanchez, Petri Nikkola, Hartmut Zohm

2005

High-bootstrap, noninductively sustained electron internal transport barriers in the Tokamak a Configuration Variable

Olivier Sauter, Stefano Coda, Timothy Goodman, Yann Camenen, Roland Behn, Alberto Bottino, Emiliano Fable, Andrea Scarabosio, Costanza Zucca, Andrei Martynov

Important ingredients of the advanced-tokamak route to fusion have been explored in depth in the Tokamak a Configuration Variable [F. Hofmann, J. B. Lister, M. Anton , Plasma Phys. Controlled Fusion 36, B277 (1994)] over the past two years. Using a uniquel ...

American Institute of Physics2005

Physics of steady-state electron internal transport barriers on TCV

Olivier Sauter, Stefano Coda, Timothy Goodman, Yann Camenen, Roland Behn, Alberto Bottino, Emiliano Fable, Costanza Zucca, Petri Nikkola, Andrei Martynov

2005

The front steering launcher design for the ITER ECRH upper port

Olivier Sauter, René Chavan, Francisco Sanchez, Petri Nikkola, Hartmut Zohm

2005

Rapid electron internal transport barrier formation during magnetic shear reversal in fully non-inductive TCV discharges

Olivier Sauter, Stefano Coda, Timothy Goodman, Antoine Pochelon, Yann Camenen, Emiliano Fable, Costanza Zucca, Petri Nikkola

The rapid formation of an electron internal transport barrier (eITB) is observed during a slow evolution (similar or equal to 200 ms) from a centrally peaked to a hollow current density profile, while all external actuators remain constant. The time consta ...

IOP Publishing Ltd2005