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René Chavan

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Publications associées (99)

Plasma radiation dynamics with the upgraded Absolute Extreme Ultraviolet tomographical system in the Tokamak a Configuration Variable

René Chavan, Basil Duval, Benoît Labit

We introduce an upgraded version of a tomographical system which is built up from Absolute Extreme Ultraviolet-type (AXUV) detectors and has been installed on the Tokamak a Configuration Variable (TCV). The system is suitable for the investigation of fast ...

Amer Inst Physics2013

The ITER EC H&CD Upper Launcher: Maintenance concepts

René Chavan, Jean-Daniel Landis

Maintenance of the ITER EC H&CD Upper Launcher (UL) shall be performed through the use of Remote Handling (RH) in the ITER Hot Cell Facility (HCF). The UL design will have to be fully compliant with ITER RH maintenance requirements and the set of RH toolin ...

Elsevier Science Sa2013

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

The ITER EC H&CD upper launcher: Structural design

René Chavan, Timothy Goodman, Jean-Daniel Landis

Four ITER EC H&CD (Electron Cyclotron Heating and Current Drive) Upper Launchers will be installed in the ITER Tokamak to counteract plasma instabilities by injection of up to 20 MW of millimeter-wave power at 170 GHz. Each Launcher features a structural s ...

Elsevier2011

Overview of the ITER EC H&CD system and its capabilities

Stefano Alberti, René Chavan, Timothy Goodman, Olivier Sauter, Minh Quang Tran, Jean-Philippe Hogge, Jean-Daniel Landis, Hartmut Zohm, Laurie Porte, Robert Bertizzolo, Francisco Sanchez, Ioannis Pagonakis, Emanuele Poli

The Electron Cyclotron (EC) system for the ITER tokamak is designed to inject >= 20 MW RF power into the plasma for Heating and Current Drive (H&CD) applications. The EC system consists of up to 26 gyrotrons (between 1 and 2 MW each), the associated power ...

Elsevier2011

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

The ITER EC H&CD upper launcher: Analysis of remote handling compatibility

René Chavan, Timothy Goodman

The present design of the ECH (Electron Cyclotron Heating) upper port launcher has been evaluated in light of the ITER remote handling (RH) requirements. Changes to the launcher design associated with the accessibility, maintainability and manageability of ...

Elsevier2011

A scoping study of the application of neutral beam heating on the TCV tokamak

René Chavan, Basil Duval, Olivier Sauter, Henri Weisen, Alexander Karpushov, Emiliano Fable

The TCV tokamak contributes to the physics understanding of fusion plasmas, broadening the parameter range of reactor relevant regimes, by investigations based on an extensive use of the existing main experimental tools: flexible shaping and high power rea ...

Elsevier B.V.2011

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

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

Progress on the ITER H&D EC Upper Launcher Steering-Mirror Control System

René Chavan, Timothy Goodman, Jean-Daniel Landis, Robert Bertizzolo, Francisco Sanchez, Frédéric Dolizy, Federico Alberto Alfredo Felici

The ITER Heating and Current Drive Upper Launcher (H&CD EC UL) uses a pneumomechanical steering-mirror assembly (SMA) to steer the RF beams for their deposition in the appropriate location in the plasma to control magnetohydrodynamic activity (neoclassical ...

Institute of Electrical and Electronics Engineers2010

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

Progress On The Iter Upper Launcher Millimeter Wave Design And Testing

René Chavan, Frédéric Dolizy, Federico Alberto Alfredo Felici

The main purpose of the ITER ECH upper launcher is to control magnetohydrodynamic activity, in particular neoclassical tearing modes, in the plasma. The mm-wave optical system is optimized to insure that the eight RF beams are all focused to a small beam w ...

2009

Design status of the ITER ECRH upper launcher mm-wave system

René Chavan, Jean-Daniel Landis, Robert Bertizzolo, Francisco Sanchez, Frédéric Dolizy, Federico Alberto Alfredo Felici

The purpose of the ITER electron cyclotron resonance heating (ECRH) upper launcher (UL), or antennae will be to provide localised current drive by accurately directing mm-wave beams up to 2MW, out of the four allocated upper port plugs, at chosen rational ...

Elsevier2009

Progress on the ITER ECRH upper launcher steering mirror identification and control

René Chavan, Jean-Daniel Landis, Robert Bertizzolo, Francisco Sanchez, Frédéric Dolizy, Federico Alberto Alfredo Felici

The main objective of the ITER ECRH upper launcher (UL) is to control magnetohydrodynamic activity, in particular neoclassical tearing modes (NTMs), by driving several MW of EC Current near the q = 1, 3/2, 2 flux surfaces, where NTMs are expected to occur. ...

Elsevier2009

The magnetics diagnostic set for ITER

René Chavan, Jonathan Bryan Lister

The current status of the ITER magnetics diagnostic is summarised. The various risks are discussed on the basis of when they could be present during ITER operation and appropriate mitigation is reviewed. An implementation risk or common mode operation fail ...

Elsevier2009

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

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

Progress on the ITER Electron Cyclotron Heating and Current Drive Upper Launcher Steering Mirror Control System

René Chavan, Timothy Goodman, Jean-Daniel Landis, Robert Bertizzolo, Francisco Sanchez, Frédéric Dolizy, Federico Alberto Alfredo Felici

The ITER ECRH upper launcher (UL) uses a steering mechanism assembly (SMA) to steer the beams in the appropriate location for controlling magnetohydrodynamic (MILD) activity in the plasma (NTMs and sawtooth oscillations). ...

IEEE2009

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