B.P. Duval
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View article: High-resolution visible spectroscopy for ion temperature and flow velocity measurements of the TCV divertor plasma
High-resolution visible spectroscopy for ion temperature and flow velocity measurements of the TCV divertor plasma Open
A high-resolution spectroscopic system was installed on the Tokamak à Configuration Variable (TCV), whose toroidal lines-of-sight (LOS) cross the divertor region. This system simultaneously measures the Doppler broadening and Doppler shift…
View article: First velocity-space resolved measurements of relativistic electron losses in a magnetically confined plasma
First velocity-space resolved measurements of relativistic electron losses in a magnetically confined plasma Open
This letter reports on the first direct velocity-space resolved measurements of runaway electrons (REs) losses in magnetically confined plasmas using a unique Fast Particle Loss Detector (FPLD) installed on the magnetic confinement fusion …
View article: First measurements of velocity-space resolved intra-ELM fast-ion losses on the TCV tokamak
First measurements of velocity-space resolved intra-ELM fast-ion losses on the TCV tokamak Open
Edge Localised Modes (ELMs) induced fast-ion losses have been characterised in the energy, E , and pitch, , space using a unique Fast Ion Loss Detector (FILD) on the tokamak à configuration variable. The FILD is equipped with a 1…
View article: Isotope effects in linear and saturated ohmic confinement of TCV tokamak and gyrokinetic validation
Isotope effects in linear and saturated ohmic confinement of TCV tokamak and gyrokinetic validation Open
We investigated isotope effects during the tokamak à configuration variable (TCV) ohmic discharge of a diverted positive triangular shape configuration of deuterium (D) and hydrogen (H) plasmas. The transition from the linear ohmic confine…
View article: First microsecond velocity-space resolved simultaneous measurements of co- and counter-current fast-ion losses in forward and reverse magnetic field in a tokamak
First microsecond velocity-space resolved simultaneous measurements of co- and counter-current fast-ion losses in forward and reverse magnetic field in a tokamak Open
A novel Fast Ion Loss Detector was designed, manufactured, installed and commissioned at the Tokamak á Configuration Variable. This is the first Fast Ion Loss Detector to feature four collimators that enable simultaneous detection of co- a…
View article: Interpretation of divertor ion temperature measurements from an attached towards a detached regime
Interpretation of divertor ion temperature measurements from an attached towards a detached regime Open
We present simultaneous profiles of the poloidal distribution of electron temperature and density ( T e , n e ), the poloidal emissivity distributions of a range of spectral lines together with the corresponding ion temperatures, T i , in …
View article: L–H power threshold for neutral beam heated plasmas with deuterium, hydrogen, helium and mixed ion species in TCV
L–H power threshold for neutral beam heated plasmas with deuterium, hydrogen, helium and mixed ion species in TCV Open
A systematic study of the power threshold for L–H transition has been conducted in TCV. Only results from NB heated plasmas are reported. The dependencies of on plasma current, plasma density and main ion species have been investig…
View article: An upper pressure limit for low-<i>Z</i> benign termination of runaway electron beams in TCV
An upper pressure limit for low-<i>Z</i> benign termination of runaway electron beams in TCV Open
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…
View article: Transport and confinement physics: Chapter 2 of the special issue: on the path to tokamak burning plasma operation
Transport and confinement physics: Chapter 2 of the special issue: on the path to tokamak burning plasma operation Open
Progress in physics understanding and theoretical model development of plasma transport and confinement (TC) in the ITPA TC Topical Group since the publication of the ITER Physics Basis (IPB) document (Doyle et al 2007 Nucl. Fusion 47 S18)…
View article: Machine learning enhanced tomographic reconstruction for multispectral imaging on TCV
Machine learning enhanced tomographic reconstruction for multispectral imaging on TCV Open
A multispectral camera setup is used to infer a 2D map of plasma parameters in a tokamak from spectral emissions. However, the light measured by these cameras is line integrated in the toroidal direction, whereas emissivities on the poloid…
View article: Investigating the influence of divertor baffles on nitrogen-seeded detachment in TCV with SOLPS-ITER simulations and TCV experiments
Investigating the influence of divertor baffles on nitrogen-seeded detachment in TCV with SOLPS-ITER simulations and TCV experiments Open
Plasma edge simulations with the SOLPS-ITER code are performed to study the influence of divertor baffles on nitrogen-seeded detachment in Tokamak à Configuration Variable (TCV) single-null, L-mode discharges. Scans of nitrogen seeding rat…
View article: Dependence of divertor turbulence on plasma density and current in TCV
Dependence of divertor turbulence on plasma density and current in TCV Open
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 turbule…
View article: Experimental research on the TCV tokamak
Experimental research on the TCV tokamak Open
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 …
View article: Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration
Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration Open
Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The imp…
View article: Expulsion of runaway electrons using ECRH in the TCV tokamak
Expulsion of runaway electrons using ECRH in the TCV tokamak Open
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 exis…
View article: Automated shot-to-shot optimization of the plasma start-up scenario in the TCV tokamak
Automated shot-to-shot optimization of the plasma start-up scenario in the TCV tokamak Open
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 mor…
View article: X-point radiator and power exhaust control in configurations with multiple X-points in TCV
X-point radiator and power exhaust control in configurations with multiple X-points in TCV Open
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 …
View article: Study of impurity C transport and plasma rotation in negative triangularity on the TCV tokamak
Study of impurity C transport and plasma rotation in negative triangularity on the TCV tokamak Open
Carbon impurity transport is studied in the TCV tokamak using a charge exchange recombination diagnostic. TCVs flexible shaping capabilities were exploited to extend previous impurity transport studies to negative triangularity ( δ < 0). A…
View article: Comparison of detachment in Ohmic plasmas with positive and negative triangularity
Comparison of detachment in Ohmic plasmas with positive and negative triangularity Open
In recent years, negative triangularity (NT) has emerged as a potential high-confinement L-mode reactor solution. In this work, detachment is investigated using core density ramps in lower single null Ohmic L-mode plasmas across a wide ran…
View article: Experimental validation of momentum transport theory in the core of H-mode plasmas in the ASDEX Upgrade tokamak
Experimental validation of momentum transport theory in the core of H-mode plasmas in the ASDEX Upgrade tokamak Open
This study employs the established momentum transport analysis at ASDEX Upgrade [Zimmermann et al., Nucl. Fusion 63, 124003 (2023)] to investigate the parametric variations of the momentum transport coefficients in the core of H-mode plasm…
View article: Parallel flows as a key component to interpret Super-X divertor experiments
Parallel flows as a key component to interpret Super-X divertor experiments Open
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 confi…
View article: X-point radiator and power exhaust control in configurations with multiple X-points in TCV
X-point radiator and power exhaust control in configurations with multiple X-points in TCV Open
The purpose of this data repository is to provide supplementary material to the article entitled "X-point radiator and power exhaust control in configurations with multiple X-points in TCV" [Gorno et al., submitted to PoP, 2024]. The diver…
View article: Overview of ASDEX upgrade results in view of ITER and DEMO
Overview of ASDEX upgrade results in view of ITER and DEMO Open
Experiments on ASDEX Upgrade (AUG) in 2021 and 2022 have addressed a number of critical issues for ITER and EU DEMO. A major objective of the AUG programme is to shed light on the underlying physics of confinement, stability, and plasma ex…
View article: X-point radiator and power exhaust control in configurations with multiple X-points in TCV
X-point radiator and power exhaust control in configurations with multiple X-points in TCV Open
The purpose of this data repository is to provide supplementary material to the article entitled "X-point radiator and power exhaust control in configurations with multiple X-points in TCV" [Gorno et al., submitted to PoP, 2024]. The diver…
View article: Benign termination of runaway electron beams on ASDEX Upgrade and TCV
Benign termination of runaway electron beams on ASDEX Upgrade and TCV Open
This paper discusses the development of a benign termination scenario for runaway electron (RE) beams on ASDEX Upgrade and TCV. A systematic study revealed that a low electron density ( n e ) companion plasma was required to achieve a larg…
View article: Resonant interaction between runaway electrons and the toroidal magnetic field ripple in TCV
Resonant interaction between runaway electrons and the toroidal magnetic field ripple in TCV Open
This work explains the anomalously high runaway electron (RE) pitch angles inferred in the flat-top of dedicated Tokamak à Configuration Variable (TCV) experiments. Kinetic modelling shows that the resonant interaction between the gyromoti…
View article: Comparison of detachment in Ohmic plasmas with positive and negative triangularity
Comparison of detachment in Ohmic plasmas with positive and negative triangularity Open
In recent years, negative triangularity (NT) has emerged as a potential high-confinement L-mode reactor solution. In this work, detachment is investigated using core density ramps in lower single null Ohmic L-mode plasmas across a wide ran…
View article: Experimental determination of the three components of toroidal momentum transport in the core of a tokamak plasma
Experimental determination of the three components of toroidal momentum transport in the core of a tokamak plasma Open
A new approach to infer the momentum transport in tokamak core plasmas via perturbation experiments is presented. For the first time, the analysis self-consistently includes all momentum transport components and their time dependencies, wh…
View article: Comparison of momentum transport in matched hydrogen and deuterium H-mode plasmas in ASDEX Upgrade
Comparison of momentum transport in matched hydrogen and deuterium H-mode plasmas in ASDEX Upgrade Open
Advanced momentum transport analysis is used to study matched hydrogen (H) and deuterium (D) plasmas in the core of ASDEX Upgrade. The aim is to validate gyrokinetic theory and assess a possible isotope dependence. The methodology extracts…