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Duccio Testa

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Related publications (245)

A phenomenological explanation for the anomalous ion heating observed in the JET alpha-heating experiment of 1997

In the so-called alpha-heating experiment performed on the JET tokamak during the deuterium-tritium campaign of 1997, the ion temperature was found to be far exceeding (both in absolute value and in its rise time) the level that could have been expected ...

Institute of Physics2012

Edge-localized mode control by electron cyclotron waves in a tokamak plasma

Timothy Goodman, Yves Martin, Jean-Marc Moret, Olivier Sauter, Stefano Coda, Jonathan Rossel, Duccio Testa, Federico Alberto Alfredo Felici

Electron cyclotron resonance heating is applied to the edge of a high-confinement (H-mode) plasma featuring type I edge-localized modes (ELMs) in the TCV tokamak. As the deposition location is shifted gradually in a highly controlled manner towards the pla ...

IOP Publishing Ltd2012

Plasma Isotopic Effect on the Damping Rate of Toroidal Alfven Eigenmodes with Intermediate Toroidal Mode Numbers

Patrick Blanchard, Ambrogio Fasoli, Duccio Testa, Theodoros Panis

This paper reports on the results of recent experiments performed on the JET tokamak on toroidal Alfvén eigenmodes (TAEs) with toroidal mode number (n) in the range up to |n|=7. The stability properties of these medium-nTAEs are investigated experimentally ...

2012

Analysis of damping rate measurements of toroidal Alfven eigenmodes as a function of n: part I

Ambrogio Fasoli, Duccio Testa, Theodoros Panis

Complementing the database approach that has been presented in part I, this paper probes into individual plasma discharges and investigates the damping rate variations that are driven by the evolving plasma configurations. In addition to confirming the sta ...

IOP Publishing Ltd2012

Analysis of damping rate measurements of toroidal Alfven eigenmodes as a function of n: part II (vol 52, 023014, 2012)

Ambrogio Fasoli, Duccio Testa, Theodoros Panis

IOP Publishing Ltd2012

Prototyping Conventionally Wound High-Frequency Magnetic Sensors for ITER

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

The high-frequency (HF) magnetic sensors for ITER are currently based on a conventional, Mirnov-type, pick-up coil, with an effective area in the range 0.03

American Nuclear Society2012

Evidence for a new path to the self-sustainment of the thermonuclear fusion in magnetically confined burning plasma experiments

Duccio Testa, Mattia Albergante

In this work we provide the first explanation for observations made in 1997 on the Joint European Torus of unexpected ion heating with fusion-born alpha particles occurring over time scales much shorter than those theoretically foreseen. We demonstrate tha ...

IOP Publishing - EPL Association2012

Design of the ITER high-frequency magnetic diagnostic coils

Thomas Maeder, Nadine Baluc, René Chavan, Jonathan Bryan Lister, Philippe Marmillod, Duccio Testa, Francisco Sanchez, Matthieu Toussaint

This paper is an overview of work carried out on the design of the ITER high-frequency magnetic diagnostic coil (HF sensor). In the first part, the ITER requirements for the HF sensor are presented. In the second part, the ITER reference design of the HF s ...

Elsevier2011

Assessment of the ITER high-frequency magnetic diagnostic set

Thomas Maeder, René Chavan, Jonathan Bryan Lister, Jean-Marc Moret, Albert Perez, Gilbert Tonetti, Duccio Testa, Francisco Sanchez, Jérôme Guterl, Matthieu Toussaint

The ITER high-frequency (HF) magnetic diagnostic system has to provide essential measurements of MHD instabilities with vertical bar delta B-MEAS/B-POL vertical bar similar to 10(-4) (similar to 1 G) for frequencies up to 2 MHz to resolve toroidal mode num ...

Elsevier2011

Nuclear technology aspects of ITER vessel-mounted diagnostics

Duccio Testa, Matthieu Toussaint

ITER has diagnostics with machine protection, basic and advanced control, and physics roles. Several are distributed on the inner and outer periphery of the vacuum vessel. They have reduced maintainability compared to diagnostics in ports. They also endure ...

Elsevier2011

Recent JET Experiments on Alfvén Eigenmodes with Intermediate Toroidal Mode Numbers: Measurements and Modelling with the TAEFL code

Patrick Blanchard, Ambrogio Fasoli, Duccio Testa, Theodoros Panis

This paper reports the results of recent experiments performed on the JET tokamak on Alfven eigenmodes (AEs) with toroidal mode number (n) in the range n=3—15. The stability properties of these medium-n AEs are investigated experimentally using a new set o ...

IOP Publishing Ltd2011

Assessment of the ITER High-Frequency Magnetic Diagnostic Set

Thomas Maeder, René Chavan, Jonathan Bryan Lister, Jean-Marc Moret, Albert Perez, Gilbert Tonetti, Duccio Testa, Francisco Sanchez, Jérôme Guterl, Matthieu Toussaint

The ITER high-frequency (HF) magnetic diagnostic system has to provide essential measurements of MHD instabilities with |deltaBmeas/BPOL|~1e-4 (~1G) for frequencies up to 2MHz to resolve toroidal mode numbers (n) in the range |n|=10 to |n|=50. A review of ...

2011

The JET Alfven Eigenmode Local Manager for the real-time detection and tracking of a frequency-degenerate spectrum of MHD instabilities

Patrick Blanchard, Ambrogio Fasoli, Pierre Lavanchy, Duccio Testa, Theodoros Panis

We present the real-time VME system used to detect and track MHD instabilities, and particularly Alfven Eigenmodes, on the JET tokamak [J.Wesson, Tokamaks, 3rd ed., Oxford Science Publication, Oxford, 2003, p.617]. This system runs on a 1 kHz clock cycle, ...

Elsevier2011

Prototyping a High-Frequency Inductive Magnetic Sensor Using the Nonconventional, Low-Temperature Co-Fired Ceramic Technology for Use in ITER

Thomas Maeder, René Chavan, Jonathan Bryan Lister, Jean-Marc Moret, Gilbert Tonetti, Duccio Testa, Jérôme Guterl, Matthieu Toussaint

The ITER high-frequency (HF) magnetic sensor is currently intended to be a conventional, Mirnov-type, pickup coil, designed to provide measurements of magnetic instabilities with magnitude as low as |dB|~10e-4G at the position of the sensors and up to freq ...

2011

Optimization of the active MHD spectroscopy system on JET for the excitation of individual intermediate and high-n Alfven eigenmodes

Patrick Blanchard, Ambrogio Fasoli, Duccio Testa, Theodoros Panis

The stability of Alfven eigenmodes (AEs) is studied experimentally in the JET tokamak by observing the plasma response to antenna-driven frequency-sweeping perturbations at the plasma edge. During the 2008/9 experimental campaigns, the complete set of the ...

International Atomic Energy Agency2010

Active excitation and damping rate measurement of intermediate-n Toroidal Alfvén Eigenmodes in JET, C-Mod and MAST plasmas

Ambrogio Fasoli, Duccio Testa, Theodoros Panis

The stability properties of Alfvén Eigenmodes (AEs) are investigated directly using external antenna excitation and detection of stable modes in a variety of plasma configurations in different devices. Dedicated methods to measure the AE damping rate separ ...

2010

AN ALGORITHM FOR THE REAL-TIME, BLIND DETECTION, DECOMPOSITION AND TRACKING OF THE INDIVIDUAL COMPONENTS IN A DEGENERATE, MULTI-HARMONICS SPECTRUM

Patrick Blanchard, Ambrogio Fasoli, Duccio Testa, Theodoros Panis

In this work we report the successful application of an innovative method, based on the Sparse Representation of signals, to perform a real-time, unsupervised detection of the individual components in a frequency degenerate, multi-harmonic spectrum, using ...

IOP Publishing - EPL Association2010

The Dependence of the Damping Rate of Medium-n Toroidal Alfvén Eigenmodes on the Edge Plasma Elongation in JET

Patrick Blanchard, Ambrogio Fasoli, Nicolas Mellet, Duccio Testa, Theodoros Panis

This paper reports the first quantitative analysis of the measurements of the damping rate (gamma/omega) for stable Alfvén Eigenmodes (AEs) with toroidal mode number (n) in the range |n|=3-15 as function of the edge plasma elongation (kappa95). We find tha ...

IOP Publishing Ltd2010

The Magnetic Diagnostic Set for ITER

Thomas Maeder, René Chavan, Jonathan Bryan Lister, Jean-Marc Moret, Albert Perez, Gilbert Tonetti, Yannick Sébastien Fournier, Duccio Testa, Francisco Sanchez, Benoît Schaller, Jérôme Guterl, Matthieu Toussaint

This paper presents the multiple set of requirements for the ITER magnetic diagnostic systems and the current status of the various R&D activities performed by the EU partners. ...

2010

The Magnetic Diagnostic Set for ITER

Thomas Maeder, René Chavan, Jonathan Bryan Lister, Jean-Marc Moret, Albert Perez, Gilbert Tonetti, Duccio Testa, Francisco Sanchez, Jérôme Guterl, Matthieu Toussaint

2010

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