Publications de Jérémie Dubray

Present status of heating neutral beam injection system at TCV

Patrick Blanchard, Basil Duval, Damien Fasel, Ambrogio Fasoli, Yves Martin, Olivier Sauter, Stefano Coda, Ugo Siravo, Alexander Karpushov, Yanis Andrebe, Jérémie Dubray, Frédéric Dolizy, Rémy Jacquier, Matthieu Toussaint, Dmytry Mykytchuk

The paper describes the operation and upgrade of the Heating Neutral Beam Injection (HNBI) system as well as the related infrastructure at the Tokamak Configuration Variable (TCV) during the last years. In 2023, the installation of new TCV neutron shieldin ...

2025

Maintenance and optimization of the TCV power supply

Damien Fasel, Ugo Siravo, Jérémie Dubray

The TCV tokamak is powered by a flywheel generator to supply the magnetic coils and the auxiliary heating systems. The generator has just undergone its fourth major overhaul to make it ready for the next ten years, after more than thirty years of almost tr ...

Elsevier Science Sa2024

Experimental characterization of the TCV dual-frequency gyrotron and validation of numerical codes including the effect of After Cavity Interaction

Stefano Alberti, Damien Fasel, Timothy Goodman, Jean-Philippe Hogge, Ugo Siravo, Jérémie Dubray, Matthieu Toussaint, Jérémy Genoud, Falk Hans Braunmüller

A dual-frequency gyrotron has been developed within the context of the recent Tokamak à Configuration Variable (TCV) upgrade. The gyrotron is designed to generate a 1 MW, 2 seconds RF wave at 84 or 126 GHz. Before integrating the gyrotrons in the TCV tokam ...

2024

Applicability of the ITER-like EC HVPS design to the DEMO ECS

Damien Fasel, Ugo Siravo, Jérémie Dubray, Elena Gaio, Alberto Ferro

Elsevier Science Sa2024

EMC and earthing concept of the ITER EC-system

Damien Fasel, Ugo Siravo, Francisco Sanchez, Jérémie Dubray

Gyrotrons and High Voltage Power Supplies (HVPS) used on electron cyclotron (EC) systems are the source of large electromagnetic interference (EMI). Arcing events inside gyrotrons is the most frequently cited issue, but fast shutdown of a HVPS can produce ...

2023

Control upgrade for the TCV coils power supplies

Damien Fasel, Ugo Siravo, Jérémie Dubray, Nicolas Cherix

The Tokamak a` Configuration Variable (TCV) coil converters are fed, during the plasma pulse, by a flywheel generator (FG) providing the AC voltages few seconds before the plasma pulse. The synchronization with the 120 Hz frequency delivered by the FG, var ...

ELSEVIER SCIENCE SA2023

TCV Tokamak Neutron Shielding Upgrade for Dual NBI Operation

Patrick Blanchard, Basil Duval, Henri Weisen, Alexander Karpushov, Duccio Testa, Jérémie Dubray, Antoine Pierre Emmanuel Alexis Merle, Matteo Vallar

The Tokamak a Configuration variable (TCV) is equipped with two neutral beam injection (NBI) systems delivering up to 1.2 MW each for pulse durations of up to 2 s. The first system (NBI1), designed for an injection energy in the range of 25 to 30 keV has b ...

2023

Homogenous power distribution along gyrotron collector walls

Stefano Alberti, Damien Fasel, Pierre-François Isoz, Jean-Philippe Hogge, Ugo Siravo, Jérémie Dubray, Miguel Filipe Silva Füglister

EC RF power sources will play a major role in the future operation of large scale tokamaks (ITER, DEMO). A 1MW/170GHz gyrotron is the standard RF power unit considered for ITER. Even though the efficiency of such devices has been significantly increased th ...

2023

Homogenous power distribution along gyrotron collector walls

Stefano Alberti, Damien Fasel, Pierre-François Isoz, Jean-Philippe Hogge, Ugo Siravo, Jérémie Dubray, Miguel Filipe Silva Füglister

2023

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

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

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

Megawatt power generation of the dual-frequency gyrotron for TCV at 84 and 126 GHz, in long pulses

Stefano Alberti, Damien Fasel, Timothy Goodman, Blaise Marlétaz, Minh Quang Tran, Jean-Philippe Hogge, Ugo Siravo, Christian Moura, Jérémie Dubray, Ioannis Pagonakis, Jonathan Sylvain Masur, Matthieu Toussaint, Jérémy Genoud, Konstantinos Avramidis

In the frame of the TCV Tokamak upgrade, two 84/126 GHz/2 s dual frequency gyrotrons designed by SPC and KIT and manufactured by THALES will be added to the existing EC-System. The first unit has been delivered to EPFL-SPC and tested. In the commissioning ...

2020

Enhanced operation of the Eu Ec test facility

Stefano Alberti, Damien Fasel, Timothy Goodman, Albert Perez, Jean-Philippe Hogge, Ugo Siravo, Jérémie Dubray

A Test Facility (TF) has been designed and installed at SPC to allow for the commissioning of the EU gyrotrons developed in view of their integration to the ITER EC system. The first phase of operation of this TF was dedicated to the development of the EU ...

ELSEVIER SCIENCE SA2019

Electrical integration of two 1MW/2s dual-frequency gyrotrons into the EC-system of the TCV tokamak

Stefano Alberti, Damien Fasel, Albert Perez, Ugo Siravo, Jérémie Dubray

The electron-cyclotron heating system of the TCV tokamak is being enhanced as part of a major upgrade. Two MW-class dual-frequency gyrotrons will be installed. The first has already been delivered and will be fully commissioned on-site by the end of 2018 w ...

ELSEVIER SCIENCE SA2019

From W7-X Towards ITER and Beyond: 2019 Status on EU Fusion Gyrotron Developments

Stefano Alberti, Damien Fasel, Blaise Marlétaz, Jean-Philippe Hogge, Jérémie Dubray, Ioannis Pagonakis, Jérémy Genoud, Konstantinos Avramidis

In Europe, the research and development with main focus on achieving robust industrial designs of series gyrotrons for electron cyclotron heating and current drive of today's nuclear fusion experiments and towards a future DEMOnstration fusion power plant ...

IEEE2019

Manufacturing and Test of the 1 MW Long-Pulse 84/126 GHz Dual-Frequency Gyrotron for TCV

Stefano Alberti, Damien Fasel, Blaise Marlétaz, Jean-Philippe Hogge, Jérémie Dubray, Ioannis Pagonakis, Jérémy Genoud, Konstantinos Avramidis

An 1 MW long-pulse (2s), 84/126 GHz dual frequency gyrotron has been produced by THALES MSI, France responding to the needs for upgrading the ECH system of the TCV tokamak The initial tests of the prototype carried out at EPFL, Switzerland, have verified a ...

IEEE2019

High-efficiency, long-pulse operation of MW-level dual-frequency gyrotron, 84/126GHz, for the TCV Tokamak

Stefano Alberti, Damien Fasel, Timothy Goodman, Pierre-François Isoz, Pierre Lavanchy, Blaise Marlétaz, Jean-Philippe Hogge, Ugo Siravo, Jérémie Dubray, Jonathan Sylvain Masur, Miguel Filipe Silva Füglister, Matthieu Toussaint, Jérémy Genoud

The first unit of the dual-frequency gyrotron, 84-126GHz/lMW/2s, for the upgrade of the TCV ECH system has been delivered and is presently being commissioned. During a first phase, long-pulse operation (TRF>0.5s) has been achieved and powers in excess of 0 ...

IEEE2019

Jérémie Dubray

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Present status of heating neutral beam injection system at TCV

Maintenance and optimization of the TCV power supply

Experimental characterization of the TCV dual-frequency gyrotron and validation of numerical codes including the effect of After Cavity Interaction

Applicability of the ITER-like EC HVPS design to the DEMO ECS

EMC and earthing concept of the ITER EC-system

Control upgrade for the TCV coils power supplies

TCV Tokamak Neutron Shielding Upgrade for Dual NBI Operation

Homogenous power distribution along gyrotron collector walls

Homogenous power distribution along gyrotron collector walls

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

Megawatt power generation of the dual-frequency gyrotron for TCV at 84 and 126 GHz, in long pulses

Enhanced operation of the Eu Ec test facility

Electrical integration of two 1MW/2s dual-frequency gyrotrons into the EC-system of the TCV tokamak

From W7-X Towards ITER and Beyond: 2019 Status on EU Fusion Gyrotron Developments

Manufacturing and Test of the 1 MW Long-Pulse 84/126 GHz Dual-Frequency Gyrotron for TCV

High-efficiency, long-pulse operation of MW-level dual-frequency gyrotron, 84/126GHz, for the TCV Tokamak

EMC improvement of an ECH power supplies system at TCV

Beam duct for the 1 MW neutral beam heating injector on TCV

Commissioning of the heating neutral beam injector on the TCV tokamak

Embedded control systems for gyrotrons applications based on NI solutions