J. Buermans
A5062999831- Magnetic confinement fusion research
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Fault Detection and Control Systems
- Anomaly Detection Techniques and Applications
- Laser-induced spectroscopy and plasma
- Computational Fluid Dynamics and Aerodynamics
- Nuclear Materials and Properties
Ghent University
2021-2025
Laboratoire de Physique des Plasmas
2025
CEA Cadarache
2024
Royal Military Academy
2019-2024
National Centre for Nuclear Research
2021
Abstract The tokamak à configuration variable (TCV) continues to leverage its unique shaping capabilities, flexible heating systems and modern control system address critical issues in preparation for ITER a fusion power plant. For the 2019–20 campaign configurational flexibility has been enhanced with installation of removable divertor gas baffles, diagnostic capabilities an extensive set upgrades new dual frequency gyrotrons. baffles reduce coupling between main chamber allow detailed...
Abstract The research program of the TCV tokamak ranges from conventional to advanced-tokamak scenarios and alternative divertor configurations, exploratory plasmas driven by theoretical insight, exploiting device’s unique shaping capabilities. Disruption avoidance real-time locked mode prevention or unlocking with electron-cyclotron resonance heating (ECRH) was thoroughly documented, using magnetic radiation triggers. Runaway generation high- Z noble-gas injection runaway dissipation...
Wall conditioning is essential in tokamak and stellarator research to achieve plasma performance reproducibility. This paper presents an overview of recent results, both from experiments present devices modelling, view with superconducting coils, focus on W7-X, JT-60SA ITER. In these devices, the coils stay energised throughout experimental day or week which demands for new techniques that work presence nominal field, addition proven methods such as baking, glow discharge (GDC) low-Z wall...
The experiments carried out in hydrogen at the TOMAS facility show possibility of controlling plasma parameters such as temperature and electron density a combined cyclotron resonance radio frequency (ECR+RF) discharge. A maximum up to ≈6 × 1016 m−3 35 eV are observed ECR+RF propagation RF waves under weak magnetic field is analyzed. Depending on experimental conditions, radial distribution field, there can be several cases: only slow wave propagate, simultaneously fast or propagate....
Within the EUROfusion MST1 work package, a series of experiments has been conducted on AUG and TCV devices to disentangle role plasma fueling shape for onset small ELM regimes. On both devices, regimes with high confinement are achieved if only two conditions fulfilled at same time. Firstly, density separatrix must be large enough (), leading pressure profile flattening separatrix, which stabilizes type-I ELMs. Secondly, magnetic configuration close double null (DN), reduction shear in...
Abstract A sequence of fuel recovery methods was tested in JET, equipped with the ITER-like beryllium main chamber wall and tungsten divertor, to reduce plasma deuterium concentration less than 1% preparation for operation tritium. This also a key activity regard refining clean-up strategy be implemented at end 2nd DT campaign JET (DTE2) assess tools that are envisaged mitigate tritium inventory build-up ITER. The began 4 days baking 320 °C, followed by further which Ion Cyclotron Wall...
The Toroidal Magnetized System device has been significantly upgraded to enable development of various wall conditioning techniques, including methods based on ion and electron cyclotron (IC/EC) range frequency plasmas, complement plasma–wall interaction research in tokamaks stellarators. toroidal magnetic field generated by 16 coils can reach its maximum 125 mT the axis. EC system is operated at 2.45 GHz with up 6 kW forward power. IC couple 10 MHz–50 MHz. direct current glow discharge a...
Abstract Within the 9th European Framework programme, since 2021 EUROfusion is operating five tokamaks under auspices of a single Task Force called ‘Tokamak Exploitation’. The goal to benefit from complementary capabilities each machine in coordinated way and help developing scientific output scalable future largre machines. programme this ensures that ASDEX Upgrade, MAST-U, TCV, WEST JET (since 2022) work together achieve objectives Missions 1 2 Roadmap: i) demonstrate plasma scenarios...
To improve the plasma performance and control density quality during flat top phase, wall conditioning techniques are used in large fusion devices like W7-X JT60-SA. study of electron cyclotron conditioning, numerous experiments were performed on TOroidally MAgnetized System, which is operated by LPP-ERM/KMS at FZ-Jülich. It a facility designed to production, plasma–surface interactions. The produced resonance heating plasmas characterized various conditions temperature measurements using...
Abstract Efficient Electron Cyclotron Resonance Heating (ECRH) breakdown and pre-ionization can be achieved with fundamental X-mode, while higher harmonics introduce excessive stray radiation. Fundamental heating however is characterized by a low cut-off density, introducing additional power absorption mechanisms in the plasma. A good knowledge of these necessary to use X-mode as an efficient method. Numerous experiments were performed on TOroidally MAgnetized System (TOMAS) study deposition...
Abstract This paper presents an overview of the TOMAS plasma diagnostics. The Langmuir probe method is employed to measure electron temperature, density and floating potential distributions.Two triple probes (horizontal vertical distributions) a single distribution) are used. measured parameters by compared. ion neutral atom flux energy distribution respectively characterized with Residual Field Energy Analyzer Time-of-Flight Neutral Particle Analyzer. To determine elemental/charge content...
Abstract A large superconducting machine, JT-60SA has been constructed to provide major contributions the ITER program and DEMO design. For success of project fusion reactor, understanding development plasma controllability in relevant higher beta regimes are essential. focused on for scenario risk mitigation as well investigating regimes. This paper summarizes high research priorities strategy project. Recent works simulation studies prepare physics control experiments presented, such...
Abstract Electron cyclotron wall condition (ECWC) discharges are characterised in ASDEX Upgrade with full tungsten plasma facing components and X2 polarised waves launched from the equatorial ports, relevant to ECWC conditions ITER Pre-Fusion Power Operation phase 1. The characterisation of deuterium plasmas is based on experimental inputs such as electron density measurements, in-vessel pressure poloidal field maps obtained measured coil currents, well advanced tomographic methods camera...
In the TOMAS device, a triple Langmuir probe is used to measure electron temperature and density. The accuracy of this measurement depends on correct determination effective collecting area probe, which complex plasma transport processes. can be calibrated by cyclotron resonance heating experiments using cut-off density ordinary wave (O-wave). This threshold only frequency injected wave, occurrence phenomenon clearly visible in evolution. value consequently known at point calibrate...
The 1-dimensional reaction-diffusion-convection code TOMATOR-1D describes plasma production by RF waves inside a tokamak using the Braginskii continuity and heat balance equations. model simulates self-consistent radial density temperature profiles for magnetised mixtures of hydrogen helium. reproduces X2 electron cyclotron resonance heating (ECRH) plasmas on TCV proposes Bohm-like poloidal magnetic field dependent scaling anomalous diffusion convection that results from drifts in toroidal...
Abstract The toroidal magnetized system (TOMAS) plasma facility aims at complementary research on wall conditioning methods, production and plasma–surface interaction studies. This paper explores for the first time parameters in helium electron-cyclotron resonance (ECR) combined ECR + radio-frequency (RF) discharges TOMAS. discharge this work, 2.45 GHz 87.6 mT, is main one creating maintaining plasma, while addition of RF power 25 MHz allows to broaden achievable electron temperature density...
A characterization of plasma parameters and neutral particle energies fluxes has been performed for radio frequency microwave discharges in the Toroidal Magnetized System (TOMAS). movable triple Langmuir probe was used to study electron densities temperatures, a time-of-flight analyzer measure energy particles, as function total injected power antenna generate plasma. The experimental results can provide information on behavior particles at low wall conditioning plasmas.
Abstract The beams of fast runaway electrons (RE), which are often produced during tokamak discharges, particularly dangerous and can induce serious damages the vacuum vessel internal components machine. proper diagnostics RE is essential for controlling discharge, e.g., by early mitigation disruptions potentially beams. usually based on measurements radiation emitted either these electrons, or as a result their interactions with plasma and/or walls. Such recorded means probes placed outside...