Publications associées à First Measurement of the Damping Rate of High-n Toroidal Alfvén Eigenmodes in JET Tokamak Plasmas

Publications associées (12)

Reducing transport via extreme flux-surface triangularity

Based on a gyrokinetic analysis of and extrapolation from TCV discharges with large negative and positive triangularity delta, the potential of extreme | delta | in reducing turbulent transport is assessed. Linearly, both positive and negative delta can ex ...

IOP Publishing Ltd2024

TCV Tokamak Neutron Shielding Upgrade for Dual NBI Operation

Basil Duval, Henri Weisen, Duccio Testa, Patrick Blanchard, Alexander Karpushov, Antoine Pierre Emmanuel Alexis Merle, Matteo Vallar, Jérémie Dubray

The Tokamak a Configuration variable (TCV) is equipped with two neutral beam injection (NBI) systems delivering up to 1.2 MW each for pulse durations of up to 2 s. The first system (NBI1), designed for an injection energy in the range of 25 to 30 keV has b ...

2023

Mitigation of divertor edge localised mode power loading by impurity seeding

Olivier Claude Martin Février

One of the major challenges for the design of future thermonuclear reactors is the problem of power exhaust — the removal of heat fluxes deposited by plasma particles onto the plasma-facing components (PFCs) of the reactor wall. In order for the reactor to ...

IOP Publishing Ltd2023

Negative ion characterization in a helicon plasma source for fusion neutral beams by cavity ring-down spectroscopy and Langmuir probe laser photodetachment

Ivo Furno, Alan Howling, Gennady Plyushchev, Philippe Frédérique Bruno Guittienne, Riccardo Agnello, Rémy Jacquier

Negative ions are characterized in the helicon plasma source resonant antenna ion device (RAID) at the Swiss plasma center by means of cavity ring-down spectroscopy (CRDS) and Langmuir probe (LP)-assisted laser photodetachment. A high density and axially h ...

IOP Publishing Ltd2020

Nearing final design of the ITER EC H&CD Upper Launcher

Olivier Sauter, Timothy Goodman, René Chavan, Robert Bertizzolo, Jean-Daniel Landis, Matteo Vagnoni, Florian Ramseyer

The ITER ECRH system consists of 24 gyrotrons with up to 24 MW installed millimeter wave heating power at 170 GHz, power supplies, control system, transmission lines, one Equatorial and the four Upper Launchers. With its high frequency and small beam focus ...

ELSEVIER SCIENCE SA2019

Overview of recent gyrotron R&D towards DEMO within EUROfusion Work Package Heating and Current Drive

Jean-Philippe Hogge, Ioannis Pagonakis, Jérémy Genoud

Gyrotron R&D within the EUROfusion Work Package Heating and Current Drive (WPHCD) is addressing the challenging requirements posed on gyrotrons by the European concept for a demonstration fusion power plant (EU DEMO). These requirements, as specified withi ...

IOP Publishing Ltd2019

Turbulent regimes in the tokamak scrape-off layer

Paolo Ricci, Federico David Halpern, Sébastien Jolliet, Joaquim Loizu Cisquella, Annamaria Mosetto

We identify the turbulent regimes in the tokamak scrape-off layer as a function of plasma resistivity, electron to ion mass ratio, safety factor, and magnetic shear. We find that two main instabilities drive turbulence in the SOL: Drift Waves, with their r ...

2013

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Olivier Sauter, Jonathan Graves, Wilfred Anthony Cooper

Bifurcated magnetohydrodynamic (MHD) equilibrium states are computed for ITER hybrid scenario and RFX-mod SHAx configurations with very flat or reversed core magnetic shear conditions. In the ITER studies, the minimum inverse rotational transform qmin is n ...

IOP Publishing2011

Practical solutions for reliable triple probe measurements in magnetized plasmas

Ambrogio Fasoli, Ivo Furno, Christian Gabriel Theiler, Philippe Marmillod

The triple probe method to obtain local, time-resolved measurements of density, electron temperature and plasma potential is investigated in detail. The difficulties in obtaining reliable measurements with this technique are discussed and overcome. These i ...

2011

Functional Performance Analysis and Optimization for the High-Frequency Magnetic Diagnostic System in ITER - I: Overview of the Results

Jonathan Bryan Lister, Duccio Testa, Jean-Marc Moret, René Chavan, Matthieu Toussaint

The measurement performance of the baseline system design for the ITER high-frequency magnetic diagnostic has been analyzed using an algorithm based on the sparse representation of signals. This algorithm, derived from the SparSpec code [S.Bourguignon et a ...

American Nuclear Society2009

Influence of particle sources on electron density peaking in TCV and JET

Henri Weisen, Alexander Karpushov, Alexey Zabolotskiy

Calculations of the particle flux caused by neutrals originating from the edge are performed for TCV and JET using the one-dimensional kinetic transport code Kn1D. The analysis, confirmed by experimental evidence, shows that for TCV and JET edge fuelling a ...

IOP Publishing Ltd2006

Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV tokamak

Richard Pitts, Yves Martin, Stefano Alberti, Laurie Porte, Alexander Karpushov, Alessandro Bortolon, Gilles Arnoux

In the moderate magneticfield of TCV (1.5T), the recently installed X3 system (3 gyrotrons @118 GHz, 0.45 MW/each, 2s) broadens the operational space with the possibility of heating plasmas at high density, well above the cutoff density of the X2 system (X ...

2005