Publications de Luke Simons | EPFL Graph Search

An upper pressure limit for low-Z benign termination of runaway electron beams in TCV

Basil Duval, Stefano Coda, Holger Reimerdes, Joan Decker, Umar Sheikh, Luke Simons, Claudia Colandrea

We present a model for the particle balance in the post-disruption runaway electron plateau phase of a tokamak discharge. The model is constructed with the help of, and applied to, experimental data from TCV discharges investigating the so-called 'low-Z be ...

IOP Publishing Ltd2025

Investigating the influence of divertor baffles on nitrogen-seeded detachment in TCV with SOLPS-ITER simulations and TCV experiments

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Guang-Yu Sun, Luke Simons, Olivier Claude Martin Février, Sophie Danielle Angelica Gorno, Claudia Colandrea

Plasma edge simulations with the SOLPS-ITER code are performed to study the influence of divertor baffles on nitrogen-seeded detachment in Tokamak & agrave; Configuration Variable (TCV) single-null, L-mode discharges. Scans of nitrogen seeding rate are con ...

IOP Publishing Ltd2025

𝑋-Point Target Radiator Regime in Tokamak Divertor Plasmas

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Artur Perek, Luke Simons, Garance Hélène Salomé Durr-Legoupil-Nicoud, Daniele Hamm, Francesco Pastore, Sophie Danielle Angelica Gorno, Curdin Tobias Wüthrich

Fusion plasma regimes with a strongly radiating magnetic 𝑋 point are promising candidates to tackle the outstanding power exhaust challenge in reactor-scale devices. In this Letter, we report on a new type of 𝑋-point radiator, the XPTR (𝑋-point target radi ...

American Physical Society (APS)2025

Interpretation of divertor ion temperature measurements from an attached towards a detached regime

Basil Duval, Patrick Blanchard, Holger Reimerdes, Christian Gabriel Theiler, Artur Perek, Luke Simons, Christine Stollberg, Olivier Claude Martin Février, Lorenzo Martinelli, Sophie Danielle Angelica Gorno

We present simultaneous profiles of the poloidal distribution of electron temperature and density (Te, ne), the poloidal emissivity distributions of a range of spectral lines together with the corresponding ion temperatures, Ti, in the TCV divertor plasma. ...

2025

Experimental investigation of the radial structure of energetic particle driven GAM in TCV

Duccio Testa, Alexander Karpushov, Mario Ludovico Podesta, Umar Sheikh, Luke Simons, Jesús Poley Sanjuán

High amplitude energetic particle geodesic acoustic mode (EGAM) oscillations driven by Neutral Beam (NBI) injected in the direction counter to the toroidal plasma current are observed in the TCV tokamak. The modes appear at frequencies close to the geodesi ...

IOP Publishing Ltd2025

Access to an ELM-suppressed X-point radiator regime in TCV snowflake minus configurations

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Artur Perek, Guang-Yu Sun, Luke Simons, Daniele Hamm, Olivier Claude Martin Février, Sophie Danielle Angelica Gorno, Curdin Tobias Wüthrich

TCV’s operating regime with an X-point radiator (XPR) has been broadened by changing the magnetic geometry. XPRs have properties that could make them an attractive power exhaust solution for fusion reactors. These include the conversion of a high fraction ...

Elsevier2024

X-point radiator and power exhaust control in configurations with multiple X-points in TCV

Holger Reimerdes, Christian Gabriel Theiler, Federico Alberto Alfredo Felici, Antoine Pierre Emmanuel Alexis Merle, Artur Perek, Guang-Yu Sun, Luke Simons, Garance Hélène Salomé Durr-Legoupil-Nicoud, Olivier Claude Martin Février, Filippo Bagnato

Novel power exhaust solutions are being developed to address the challenge of integrating a high performance fusion core plasma with a well-protected divertor, if the single null configuration does not scale to a reactor device. This work aims to elucidate ...

American Institute of Physics (AIP)2024

Experimental research on the TCV tokamak

Olivier Sauter, Ambrogio Fasoli, Stefano Coda, Timothy Goodman, Yves Martin, Stefano Alberti, Ivo Furno, Duccio Testa, Patrick Blanchard, Holger Reimerdes

Tokamak à configuration variable (TCV), recently celebrating 30 years of near-continual operation, continues in its missions to advance outstanding key physics and operational scenario issues for ITER and the design of future power plants such as DEMO. The ...

IOP Publishing Ltd2024

Overview of the EUROfusion Tokamak Exploitation programme in support of ITER and DEMO

Olivier Sauter, Basil Duval, Stefano Coda, Timothy Goodman, Jean-Marc Moret, Duccio Testa, Patrick Blanchard, Holger Reimerdes, Benoît Labit, Christian Gabriel Theiler

Within the 9th European Framework programme, since 2021 EUROfusion is operating five tokamaks under the auspices of a single Task Force called ‘Tokamak Exploitation’. The goal is to benefit from the complementary capabilities of each machine in a coordinat ...

IOP Publishing Ltd2024

Expulsion of runaway electrons using ECRH in the TCV tokamak

Basil Duval, Stefano Coda, Cristian Sommariva, Laurie Porte, Joan Decker, Umar Sheikh, Luke Simons, Umesh Kumar, Jean Arthur Cazabonne, Arsène Stéphane Tema Biwole

Runaway electrons (REs) are a concern for tokamak fusion reactors from discharge startup to termination. A sudden localized loss of a multi-megaampere RE beam can inflict severe damage to the first wall. Should a disruption occur, the existence of a RE see ...

IOP Publishing Ltd2024