Publications de Curdin Tobias Wüthrich

Dependence of divertor turbulence on plasma density and current in TCV

Basil Duval, Christian Gabriel Theiler, Garance Hélène Salomé Durr-Legoupil-Nicoud, Davide Galassi, Curdin Tobias Wüthrich, Nicola Offeddu

To reliably predict the distribution of heat and particle fluxes at the target plates of tokamaks, a comprehensive understanding of turbulence throughout the entire Scrape-Off-Layer (SOL) is imperative. This study examines divertor turbulence systematicall ...

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

Characterization of the I-phase regime at TCV

Christian Gabriel Theiler, Curdin Tobias Wüthrich, Nicola Offeddu

The I-phase is an H-mode confinement regime of tokamaks characterized by limit cycle oscillations, the so-called LCOs or bursts. These bursts are the manifestation of a periodic flattening of the plasma edge pressure profile. The profile flattening is caus ...

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

Automated shot-to-shot optimization of the plasma start-up scenario in the TCV tokamak

Basil Duval, Stefano Coda, Federico Alberto Alfredo Felici, Antoine Pierre Emmanuel Alexis Merle, Cristian Galperti, Artur Perek, Pedro Andres Molina Cabrera, Curdin Tobias Wüthrich

Plasma start-up is typically achieved manipulating poloidal magnetic fields, gas injection and possibly auxiliary heating. Model-based design techniques have been gaining increasing attention in view of future large tokamaks which have more stringent const ...

IOP Publishing Ltd2024

Role of radiation re-absorption in the thermal helium beam diagnostic

Christian Gabriel Theiler, Yanis Andrebe, Curdin Tobias Wüthrich

The Thermal Helium Beam (THB) is a diagnostic for simultaneously measuring the electron temperature and density profiles of the plasma edge and scrape off layer (SOL). It exploits the line ratio technique of selected He line intensities, emitted by He gas ...

2024

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

Parallel flows as a key component to interpret Super-X divertor experiments

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Artur Perek, Guang-Yu Sun, Luke Simons, Olivier Claude Martin Février, Garance Hélène Salomé Durr-Legoupil-Nicoud, Davide Galassi

The Super-X Divertor (SXD) is an alternative divertor configuration leveraging total flux expansion at the Outer Strike Point (OSP). While the extended 2-Point Model (2PM) predicts facilitated detachment access and control in the SXD configuration, these a ...

IOP Publishing Ltd2024

Divertor turbulence characterisation using Gas Puff Imaging in the TCV tokamak

Curdin Tobias Wüthrich

The performance of magnetic confinement fusion devices, such as tokamaks, is strongly correlated to the phenomena that occur in the boundary region of the plasma core that faces the wall of the device. The dominant cross-field transport mechanisms from the ...

EPFL2024

Estimating cross-field particle transport at the outer midplane of TCV by tracking filaments with machine learning

Christian Gabriel Theiler, Davide Galassi, Claudia Colandrea, Curdin Tobias Wüthrich, Nicola Offeddu

Cross-field transport of particles in the boundary region of magnetically confined fusion plasmas is dominated by turbulence. Blobs, intermittent turbulent structures with large amplitude and a filamentary shape appearing in the scrape-off layer (SOL), are ...

IOP Publishing Ltd2023