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376 results on '"DE TOMMASI, GIANMARIA"'

1. Vertical stabilization of tokamak plasmas via Extremum Seeking

Author

De Tommasi, Gianmaria, di Grazia, Luigi Emanuel, Dubbioso, Sara, Mattei, Massimiliano, Mele, Adriano, and Pironti, Alfredo

Subjects
Physics - Plasma Physics, 93D15
Abstract

In this paper we propose a vertical stabilization~(VS) control system for tokamak plasmas based on the extremum seeking (ES) algorithm. The gist of the proposed strategy is to inject an oscillating term in the control action and exploit a modified ES algorithm in order to bring to zero the average motion of the plasma along the unstable mode. In this way, the stabilization of the unstable vertical dynamic of the plasma is achieved. The approach is validated by means of both linear and nonlinear simulations of the overall~ITER tokamak magnetic control system, with the aim of demonstrating robust operation throughout the flat-top phase of a discharge and the capability of reacting to a variety of disturbances., Comment: 17 pages, 14 figures

Published
2022

3. Empirical error field control at JET in preparation of ITER start-up

Author

Piron, L., Paz-Soldan, Carlos, Lennholm, Morten, Kirov, Krassimir, Valcarcel, Daniel, Baruzzo, Matteo, Bolzonella, Tommaso, Cicioni, Rachele, De Vries, Peter, Ferron, Nicolò, Gambrioli, Matteo, Gribov, Y., Henriques, R., Joffrin, Emmanuel, Martin, Piero, Mattei, Massimiliano, Manduchi, Gabriele, Pangione, Luigi, Pigatto, Leonardo, Pironti, Alfredo, De Tommasi, Gianmaria, and Zabeo, Luca

Published
2024
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4. Finite-Time stabilization of linear systems with unknown control direction via Extremum Seeking

Author

Mele, Adriano, De Tommasi, Gianmaria, and Pironti, Alfredo

Subjects
Mathematics - Optimization and Control
Abstract

In this paper the finite-time stabilization problem is solved for a linear time-varying system with unknown control direction by exploiting a modified version of the classical extremum seeking algorithm. We propose to use a suitable oscillatory input to modify the system dynamics, at least in an average sense, so as to satisfy a Differential Linear Matrix Inequality (DLMI) condition which in turns guarantees that the system's state remains inside a prescribed time varying hyper-ellipsoid in the state space. The finite-time stability (FTS) of the averaged dynamics implies the FTS of the original system, as the distance between the original and the averaged dynamics can be made arbitrarily small by choosing a sufficiently high value of the dithering frequency used by the extremum seeking algorithm. An estimate of the necessary minimum dithering/mixing frequency is provided, and the effectiveness of the proposed finite-time stabilization approach is analysed by means of numerical examples.

Published
2021

11. Error field detection and correction studies towards ITER operation

Author

Piron, Lidia, primary, Paz-Soldan, Carlos, additional, Pigatto, Leonardo, additional, Zanca, Paolo, additional, Sauter, Olivier, additional, Pütterich, Thomas, additional, Bettini, Paolo, additional, Bonotto, Matteo, additional, Cunningham, Geoffrey, additional, De Tommasi, Gianmaria, additional, Ferron, Nicolò, additional, Gambrioli, Matteo, additional, Graham, Georgina, additional, de Vries, Peter C, additional, Gribov, Yuri, additional, Hu, Qiming, additional, Kirov, Krassimir K, additional, Logan, Nikolas, additional, Lennholm, Morten, additional, Mattei, Massimiliano, additional, Maraschek, Marc, additional, Markovic, Tomas, additional, Manduchi, Gabriele, additional, Martin, Piero, additional, Pironti, Alfredo, additional, Polevoi, Alexei R, additional, Ravensbergen, Timo, additional, Ryan, David Anthony, additional, Sieglin, Bernhard, additional, Suttrop, Wolfgang, additional, Terranova, David, additional, Teschke, Markus, additional, Valcarcel, Daniel, additional, and Vincent, Charles, additional

Published
2024
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14. A Variant of the Generalized Assignment Problem for Reliable Allocation of Sensor Measurements in a Diagnostic System

Author

De Tommasi, Gianmaria, Neto, André C., Sforza, Antonio, Sterle, Claudio, Vigo, Daniele, Editor-in-Chief, Agnetis, Alessandro, Series Editor, Amaldi, Edoardo, Series Editor, Guerriero, Francesca, Series Editor, Lucidi, Stefano, Series Editor, Messina, Enza, Series Editor, Sforza, Antonio, Series Editor, Dell'Amico, Mauro, editor, Gaudioso, Manlio, editor, and Stecca, Giuseppe, editor

Published
2019
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17. Input-Output Finite-Time Stability

Author

De Tommasi, Gianmaria, Ambrosino, Roberto, Carannante, Giuseppe, Cosentino, Carlo, Pironti, Alfredo, and Amato, Francesco

Subjects
Computer Science - Systems and Control, Mathematics - Optimization and Control
Abstract

This paper introduces the extension of Finite-Time Stability (FTS) to the input-output case, namely the Input-Output FTS (IO-FTS). The main differences between classic IO stability and IO-FTS are that the latter involves signals defined over a finite time interval, does not necessarily require the inputs and outputs to belong to the same class of signals, and that quantitative bounds on both inputs and outputs must be specified. This paper revises some recent results on IO-FTS, both in the context of linear systems and in the context of switching systems. In the final example the proposed methodology is used to minimize the maximum displacement and velocity of a building subject to an earthquake of given magnitude., Comment: 14 pages, 9 figures, 2 tables. This paper has been accepted for presentation at AUTOMATICA.IT, Convegno Annuale dei Docenti e Ricercatori Italiani in Automatica, Pisa, Italy, September 2011

Published
2011

22. Controller Design for the Finite-Time Stabilization of IDLSs

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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23. FTS Analysis Via PQLFs

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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24. FTS of IDLSs

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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25. Robustness Issues for IDLSs

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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26. FTS of Discrete-Time Linear Systems

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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28. Robustness Issues

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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29. Introduction

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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30. FTS Analysis of Continuous-Time Linear Systems

Author

Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, De Tommasi, Gianmaria, Thoma, Manfred, Series editor, Allgöwer, Frank, Series editor, Morari, Manfred, Series editor, Amato, Francesco, Ambrosino, Roberto, Ariola, Marco, Cosentino, Carlo, and De Tommasi, Gianmaria

Published
2014
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35. Strategy to Systematically Design and Deploy the Iter Plasma Control System: A System Engineering and Model-Based Design Approach

Author

De Vries, Peter C., primary, Cinque, Marcello, additional, de Tommasi, Gianmaria, additional, Treutterer, Wolfgang, additional, Humphreys, David A., additional, Walker, Michael L., additional, Felici, Frederico, additional, Gomez, Igor, additional, Zabeo, Luca, additional, Ravensbergen, Timo, additional, Luigi, Pangione, additional, Rimini, Fernanda, additional, Rosiello, Stefano, additional, Gribov, Yuri, additional, Dubrov, Maksim, additional, Vu, Anna Trang, additional, Carvalho, Ivo, additional, Lee, Woonryol, additional, Tak, Taehyun, additional, Zagar, Anze, additional, Gunion, Robert, additional, Pitts, Richard, additional, Mattei, Massimiliano, additional, Pironti, Alfredo, additional, Kudlacek, Ondrej, additional, Raupp, Gerhard, additional, Pautasso, Gabriella, additional, Nouailletas, Remy, additional, Moreau, Philippe Jacques, additional, and Weoldon, David, additional

Published
2023
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45. First plasma operation of the enhanced JET vertical stabilisation system

Author

Rimini, Fernanda G., Crisanti, Flavio, Albanese, Raffaele, Ambrosino, Giuseppe, Ariola, Marco, Artaserse, Giovanni, Bellizio, Teresa, Coccorese, Vincenzo, De Tommasi, Gianmaria, De Vries, Peter, Lomas, Peter J., Maviglia, Francesco, Neto, Andre, Nunes, Isabel, Pironti, Alfredo, Ramogida, Giuseppe, Sartori, Filippo, Shaw, Stephen R., Tsalas, Maximos, Vitelli, Riccardo, and Zabeo, Luca

Published
2011
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50. Design of the plasma position and shape control in the ITER tokamak using in-vessel coils

Author

Ambrosino, Giuseppe, Ariola, Marco, De Tommasi, Gianmaria, Pironti, Alfredo, and Portone, Alfredo

Subjects
Business, Chemistry, Electronics, Electronics and electrical industries
Abstract

The International Thermonuclear Experimental Reactor (ITER) is the next step toward the realization of electricity-producing fusion power plants, and it is planned to be in operation in 2016. ITER has been designed so as to reach the plasma burning condition and to operate with high-elongated unstable plasmas. However, due to the constraints that affect the machine realization, these open-loop unstable high-performance plasmas can hardly be stabilized using the poloidal field coils placed outside the tokamak vessel. For this reason, during the ITER design review phase, it has been proposed to investigate the possibility of using in-vessel coils in order to improve the best achievable performance of the vertical stabilization (VS) system. This paper proposes a new approach for the plasma current, position, and shape control design in the presence of in-vessel coils. Two control loops are designed: a first loop that guarantees the VS driving the voltage applied to in-vessel coils, and a second loop that controls the plasma current and up to 32 geometrical shape descriptors as close as possible to the reference values. The performance of the proposed control system is shown by means of simulations of some cases of interest. Index Terms--Plasma shape control, plasma vertical stabilization (VS), tokamaks control.

Published
2009

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