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Matteo Vallar

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Publications associées (23)

Enhanced confinement in diverted negative-triangularity L-mode plasmas in TCV

Olivier Sauter, Stefano Coda, Benoît Labit, Alessandro Pau, Laurie Porte, Antoine Pierre Emmanuel Alexis Merle, Umar Sheikh, Cedric Kar-Wai Tsui, Alessandro Marinoni, Matteo Vallar, Filippo Bagnato, Leonardo Pigatto

The favorable confinement properties of negative-triangularity (NT) tokamak configurations were discovered in the TCV tokamak in the late 1990s and were documented over the two following decades, through investigations of predominantly electron-heated plas ...
IOP Publishing Ltd2022

Development of a reduced model for energetic particle transport by sawteeth in tokamaks

Mario Ludovico Podesta, Francesca Maria Poli, Anna Teplukhina, Matteo Vallar, Jiangyan Yang

The sawtooth instability is known for inducing transport and loss of energetic particles (EPs), and for generating seed magnetic islands that can trigger tearing modes. Both effects degrade the overall plasma performance. Several theories and numerical mod ...
IOP Publishing Ltd2022

Simulating energetic particle losses in JET plasmas with a reverse integration biasing scheme

Mario Ludovico Podesta, Matteo Vallar

An integrated energetic particle transport model has been constructed in JET plasmas constrained by experimental fast ion loss measurements. The model incorporates a synthetic fast ion loss detector identical to JET's thin-foil Faraday cup fast ion loss de ...
IOP Publishing Ltd2022

Numerical studies on saturated kink and sawtooth induced fast ion transport in JET ITER-like plasmas

Mario Ludovico Podesta, Matteo Vallar

This presentation examines the energetic particle transport induced by saturated kink modes and sawtooth crashes in JET deuterium plasmas. It is known that kink mode-resonant transport and phase-space redistribution from sawtooth crashes can drive strong f ...
IOP Publishing Ltd2022

Improved heat and particle flux mitigation in high core confinement, baffled, alternative divertor configurations in the TCV tokamak

Basil Duval, Patrick Blanchard, Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler, Umar Sheikh, Artur Perek, Sophie Danielle Angelica Gorno, Claudia Colandrea, Matteo Vallar, Hugo De Oliveira, Filippo Bagnato, Harshita Raj

Nitrogen seeded detachment has been achieved in the tokamak a configuration variable (TCV) in alternative divertor configurations (ADCs), namely X-divertor and X-point target, with and without baffles in H-mode plasmas with high core confinement. Both ADCs ...
IOP Publishing Ltd2022

Upgrade of the neutral beam heating system on the TCV tokamak - second high energy neutral beam

Ambrogio Fasoli, Basil Duval, Stefano Coda, Yves Martin, Holger Reimerdes, Alexander Karpushov, Damien Fasel, Umar Sheikh, Matthieu Toussaint, Pierre Lavanchy, Ugo Siravo, Rémy Jacquier, Marcelo Baquero Ruiz, Frédéric Dolizy, Jérémie Dubray, Claudia Colandrea, Dmytry Mykytchuk, Blaise Marlétaz, Matteo Vallar, Filippo Bagnato, Lorenzo Martinelli

The TCV tokamak continues to leverage its unique shaping capabilities, flexible heating systems and modern control system to provide a stepladder approach for extrapolations of experimental results from different ma-chines to ITER and DEMO. TCV's configura ...
ELSEVIER SCIENCE SA2022

L-mode plasmas analyses and current ramp-up predictions for a JT-60SA hybrid scenario

Timothy Goodman, Javier García Hernández, Matteo Vallar

In this work, L-mode analyses are performed in order to assess a modeling framework for the prediction of electron cyclotron resonant heating (ECRH) -assisted current ramp-up phases for JT-60SA tokamak hybrid scenario #4-2. We compare two turbulence transp ...
IOP PUBLISHING LTD2021

Thermo-mechanical assessment of the JT-60SA fast-ion loss detector

Matteo Vallar

A fast-ion loss detector (FILD) is being designed for the JT-60SA tokamak. In this work, the preliminary mechanical design of this diagnostic is described. The expected motion needed to move the probe head between the parking and the measuring positions ha ...
2021

Advances in the physics studies for the JT-60SA tokamak exploitation and research plan

Stefano Coda, Javier García Hernández, Marco Wischmeier, Matteo Vallar, Kenji Tanaka, Aylwin Iantchenko, Samuele Mazzi, Leonardo Pigatto

JT-60SA, the largest tokamak that will operate before ITER, has been designed and built jointly by Japan and Europe, and is due to start operation in 2020. Its main missions are to support ITER exploitation and to contribute to the demonstration fusion rea ...
IOP PUBLISHING LTD2020

Observation of Alfvén Eigenmodes driven by off-axis neutral beam injection in the TCV tokamak

Olivier Sauter, Basil Duval, Duccio Testa, Alexander Karpushov, Marcelo Baquero Ruiz, Matteo Vallar, Claudio Marini, Filippo Bagnato, Lorenzo Stipani

Fast-particle driven Alfv´en Eigenmodes have been observed in low-collisionality discharges with off-axis neutral beam injection (NBI), electron cyclotron resonance heating (ECRH) and a reduced toroidal magnetic field. During NBI and ECRH, toroidicity indu ...
2020

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