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Francesca Maria Poli

Cette personne a quitté l’EPFL

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Publications associées (62)

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Experimental characterization of drift-interchange instabilities in a simple toroidal plasma

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Stephan Brunner, Mario Ludovico Podesta, Francesca Maria Poli, Gennady Plyushchev

Low frequency electrostatic instabilities are investigated on TORPEX [Fasoli, Labit, McGrath, Muller, Podesta, and Poli, Bull. Am. Phys. Soc. 48, 119 (2003)], a toroidal device for basic plasma physics experiments with a toroidal magnetic field 100 mT and ...

2006

Plasma turbulence, suprathermal ion dynamics and code validation on the basic plasma physics device TORPEX

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Benoît Labit, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Mario Ludovico Podesta, Fabio Avino, Francesca Maria Poli, Gennady Plyushchev, Kyle Gustafson, Alexandre Dominique Bovet, Davoud Iraji

The TORPEX basic plasma physics device at the Center for Plasma Physics Research (CRPP) in Lausanne, Switzerland is described. In TORPEX, simple magnetized toroidal configurations, a paradigm for the tokamak scrape-off layer (SOL), as well as more complex ...

Cambridge University Press2015

A new mechanism for increasing density peaking in tokamaks: improvement of the inward particle pinch with edge E x B shearing

Yiming Li, Olivier Sauter, Richard Pitts, Ambrogio Fasoli, Basil Duval, Henri Weisen, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Nicola Vianello, Mikhail Maslov, Patrick Blanchard, Alessandro Pau, Davide Galassi, Federico Alberto Alfredo Felici, Antonio José Pereira de Figueiredo, Cristian Sommariva, Jonathan Graves, Emiliano Fable, Francesca Maria Poli, Antoine Pierre Emmanuel Alexis Merle, Federico Nespoli, Daniele Brunetti, Anna Teplukhina, Hamish William Patten, Samuel Lanthaler, Haomin Sun, Alberto Mariani, Michele Marin

Developing successful tokamak operation scenarios, as well as confident extrapolation of present-day knowledge requires a rigorous understanding of plasma turbulence, which largely determines the quality of the confinement. In particular, accurate particle ...

2019

Experimental Observation of the Blob-Generation Mechanism from InterchangeWaves in a Plasma

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler, Mario Ludovico Podesta, Francesca Maria Poli

The mechanism for blob generation in a toroidal magnetized plasma is investigated using time-resolved measurements of two-dimensional structures of electron density, temperature, and plasma potential. The blobs are observed to form from a radially elongate ...

2008

Experimental characterization and modelling of the particle source in an Electron-Cyclotron wave driven toroidal plasma

Ambrogio Fasoli, Benoît Labit, Mario Ludovico Podesta, Francesca Maria Poli

The plasma particle source resulting from ionization by microwaves in the electron-cyclotron range of frequencies is investigated in the simple magnetized torus TORPEX ( Fasoli A et al 2006 Phys. Plasmas 13 055902), together with its dependence upon experi ...

2006

Enhanced production of runaway electrons during a disruptive termination of discharges heated with lower hybrid power in the frascati tokamak upgrade

Francesca Maria Poli

We report on the observation of a large production of runaway electrons during a disruptive termination of discharges heated with lower-hybrid waves at the Frascati Tokamak Upgrade. The runaway current plateaus, which can carry up to 80% of the predisrupti ...

2006

Recurrence Plots for Dynamic Analysis of Type-I ELMs at JET With a Carbon Wall

In this paper, the dynamic characteristics of type-I edge-localized modes (ELM) time series from the JET tokamak, the world's largest magnetic confinement plasma physics experiment, have been investigated through recurrence plots (RPs). The analysis has be ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2019

Tests and developments of a long-pulse high-power 170 GHz absorbing matched load

Timothy Goodman, Stefano Alberti, Jean-Philippe Hogge, Damien Fasel, Francesca Maria Poli, Francisco Sanchez, Ioannis Pagonakis

The future EC systems will consist of several gyrotron sources providing MW-level millimeter wave power at a frequency around or above 170 GHz. The development of matched loads is necessary to test the new sources, the components for the transmission lines ...

ELSEVIER SCIENCE SA2019

Statistical properties of electrostatic turbulence in toroidal magnetized plasmas

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Jan Horacek, Paolo Ricci, Christian Gabriel Theiler, Mario Ludovico Podesta, Francesca Maria Poli, Gennady Plyushchev, Davoud Iraji

A unique parabolic relation is observed to link skewness and kurtosis of density fluctuation signals, measured over the whole cross-section of the simple toroidal device TORPEX for a broad range of experimental conditions. This relationship is also valid f ...

2007

Characterization of the electron distribution function in an electron-cyclotron driven toroidal plasma

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Mario Ludovico Podesta, Francesca Maria Poli

The local properties of the electron energy distribution function are investigated in the electron-cyclotron wave driven toroidal device TORPEX (Fasoli et al 2006 Phys. Plasmas 13 055902). The electron energy distribution function is measured by means of a ...

2007

Adaptive learning for disruption prediction in non-stationary conditions

Yiming Li, Olivier Sauter, Richard Pitts, Ambrogio Fasoli, Basil Duval, Henri Weisen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Nicola Vianello, Mikhail Maslov, Patrick Blanchard, Alessandro Pau, Davide Galassi, Federico Alberto Alfredo Felici, Antonio José Pereira de Figueiredo, Cristian Sommariva, Samuel Lanthaler, Yann Camenen, Jonathan Graves, Emiliano Fable, Francesca Maria Poli, Antoine Pierre Emmanuel Alexis Merle, Federico Nespoli, Daniele Brunetti, Anna Teplukhina, Hamish William Patten, Haomin Sun, Alberto Mariani, Michele Marin

For many years, machine learning tools have proved to be very powerful disruption predictors in tokamaks. On the other hand, the vast majority of the techniques deployed assume that the input data is independent and is sampled from exactly the same probabi ...

IOP Publishing Ltd2019

Transition from drift to interchange instabilities in an open magnetic field line configuration

Ambrogio Fasoli, Paolo Ricci, Mario Ludovico Podesta, Francesca Maria Poli

The transition from a regime dominated by drift instabilities to a regime dominated by pure interchange instabilities is investigated and characterized in the simple magnetized toroidal device TORPEX [TORoidal Plasma EXperiment, A. Fasoli et al., Phys. of ...

American Institute of Physics (AIP)2008

Mechanism for blob generation in the TORPEX toroidal plasma

Jonathan Graves, Ambrogio Fasoli, Ivo Furno, Benoît Labit, Paolo Ricci, Stephan Brunner, Christian Gabriel Theiler, Mario Ludovico Podesta, Francesca Maria Poli

The mechanism for blob generation is detailed in the toroidal magnetized plasma of the TORPEX device [ Fasoli et al., Phys. Plasmas 13, 055902 (2006) ] using an experimental configuration, which features a plasma region dominated by a coherent wave and a r ...

2008

Antenna excitation of drift wave in a toroidal plasma

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Paolo Ricci, Mario Ludovico Podesta, Francesca Maria Poli, Stefan Müller

In a magnetized toroidal plasma, an antenna tunable in vertical wave number is used to excite density perturbations. Coherent detection is performed by means of Langmuir probes to directly determine both the wave vector and the plasma response induced by t ...

American Institute of Physics2007

Control of the hydrogen:deuterium isotope mixture using pellets in JET

Yiming Li, Olivier Sauter, Richard Pitts, Ambrogio Fasoli, Basil Duval, Henri Weisen, Yann Camenen, Jan Horacek, Javier García Hernández, Duccio Testa, Marco Wischmeier, Nicola Vianello, Mikhail Maslov, Patrick Blanchard, Alessandro Pau, Davide Galassi, Antonio José Pereira de Figueiredo, Cristian Sommariva, Jonathan Graves, Federico Alberto Alfredo Felici, Emiliano Fable, Francesca Maria Poli, Antoine Pierre Emmanuel Alexis Merle, Federico Nespoli, Daniele Brunetti, Anna Teplukhina, Hamish William Patten, Samuel Lanthaler, Haomin Sun, Alberto Mariani, Michele Marin

Deuterium pellets are injected into an initially pure hydrogen H-mode plasma in order to control the hydrogen: deuterium (H:D) isotope mixture. The pellets are deposited in the outer 20% of the minor radius, similar to that expected in ITER, creating trans ...

IOP Publishing Ltd2019

Plasma production by low-field side injection of electron cyclotron waves in a simple magnetized torus

Ambrogio Fasoli, Benoît Labit, Mario Ludovico Podesta, Francesca Maria Poli

The mechanisms leading to ionization of neutral gas by means of microwaves in the electron cyclotron range of frequencies in a simple toroidal plasma configuration are investigated in the TORPEX device (Fasoli A et al 2003 Bull. Am. Phys. Soc. 48 119). The ...

2005

Development of electrostatic turbulence from drift-interchange instabilities in a toroidal plasma

Ambrogio Fasoli, Mario Ludovico Podesta, Francesca Maria Poli

Electrostatic instabilities develop on TORPEX (TORoidal Plasma EXperiment) [A. Fasoli et al., Phys. of Plasmas, 13, 55902 (2006)] in the bad curvature region and propagate consistently with the drift wave dispersion relation. The wave number and frequency ...

2007

Cross-field transport by instabilities and blobs in a magnetized toroidal plasma

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler, Mario Ludovico Podesta, Francesca Maria Poli

The mechanisms for anomalous transport across the magnetic field are investigated in a toroidal magnetized plasma. The role of plasma instabilities and macroscopic density structures (blobs) is discussed. Examples from a scenario with open magnetic field l ...

2008

Langmuir probe-based observables for plasma-turbulence code validation and application to the TORPEX basic plasma physics experiment

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler, Mario Ludovico Podesta, Francesca Maria Poli, Stefan Müller

The methodology for plasma-turbulence code validation is discussed, with focus on the quantities to use for the simulation-experiment comparison, i.e., the validation observables, and application to the TORPEX basic plasma physics experiment [A. Fasoli , P ...

American Institute of Physics (AIP)2009

Experiments in a basic plasma device in support of the comparison with linear and nonlinear theories of electrostatic instabilities

Ambrogio Fasoli, Ivo Furno, Benoît Labit, Mario Ludovico Podesta, Francesca Maria Poli

2007