A5103156995- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Antenna Design and Analysis
- Underwater Vehicles and Communication Systems
- Atomic and Subatomic Physics Research
- Electromagnetic Launch and Propulsion Technology
- Nuclear Physics and Applications
- Electrostatic Discharge in Electronics
- Vacuum and Plasma Arcs
- Radio Wave Propagation Studies
- Electron and X-Ray Spectroscopy Techniques
- Electrical Fault Detection and Protection
- Internet of Things and Social Network Interactions
- Gas Dynamics and Kinetic Theory
- High-Energy Particle Collisions Research
- Muon and positron interactions and applications
- Geophysical Methods and Applications
- Microwave Imaging and Scattering Analysis
- Viral Infections and Vectors
Technical University of Denmark
2023-2025
Institut de Recherche sur la Fusion par Confinement Magnétique
2024
CEA Cadarache
2024
National Agency for New Technologies, Energy and Sustainable Economic Development
2022
University of Padua
2022
Royal Military Academy
2016-2021
Laboratoire de Physique des Plasmas
2017-2020
Ghent University
2017-2019
Ghent University Hospital
2016-2017
Max Planck Society
2016
The European DEMO is a pulsed device with pulse length of 2 hours. functions devoted to the heating and current drive system are: plasma breakdown, ramp-up flat-top where fusion reactions occur, control during phase, finally ramp-down. EU-DEMO project was in Pre-Concept Design Phase 2014-2020, meaning that some cases, design values precise requirements from physics point view were not yet frozen. A total 130 MW considered for all phases plasma: flat top, 30 required neoclassical tearing...
We report observations of nonlinear two-plasmon decay instabilities (TPDIs) a high-power microwave beam, process similar to half-harmonic generation in optics, during electron cyclotron resonance heating tokamak. TPDIs are found occur regularly the plasma edge due wave trapping density fluctuations for various confinement modes, and frequencies both observed daughter waves agree with modeling. Emissions from cascade subsequent decays, which indicate ion Bernstein waves, correlated fast-ion...
In this paper, we present the design and commissioning results of upgraded collective Thomson scattering diagnostic at Wendelstein 7-X stellarator. The has a new radiometer designed to operate between second third harmonics electron cyclotron emission from plasma 171–177 GHz, where background minimum is order 10–100 eV. It allows us receive scattered electromagnetic field with significantly improved signal-to-noise ratio extends set possible geometries compared case original instrument...
Ion cyclotron resonance heating is a versatile method that has been demonstrated to be able efficiently couple power directly the ions via fast magnetosonic wave. However, at temperatures relevant for reactor grade devices such as DEMO, electron damping becomes increasingly important. To reduce damping, it possible use an antenna with spectrum dominated by low parallel wavenumbers. Moreover, using unidirectional spectrum, travelling wave array antenna, wavenumber can downshifted mounting in...
Abstract The SPARC tokamak is a compact high-field device that will operate at high plasma density with the aim to demonstrate net fusion energy. experimentally unexplored conditions in require carefully selected set of diagnostics for monitoring and control. Here we explore conceptual design options potential measurement capabilities collective Thomson scattering diagnostic SPARC.
 We show 140 GHz X-mode CTS system most attractive option terms optimizing signal-to-noise ratio...
Abstract For the central heating of a fusion reactor ion cyclotron radio frequency (ICRH) is first choice method as it able to couple RF power ions without density limit. The drawback this problem excitation magneto-sonic wave through plasma boundary layer from antenna located along wall, exceeding its voltage standoff. amount coupling depends on and surface admittance at output due profile. paper deals with optimization by use sections traveling-wave antennas (TWAs) distributed all wall...
Three identical new WEST Ion Cyclotron Resonance Heating (ICRH) antennas have been designed, assembled then commissioned on plasma from 2013 to 2019.The ICRH system is both load-resilient and compatible with long-pulse operations.The three successfully operated together in 2019 2020.The load resilience capability has demonstrated the antenna feedback controls for phase matching developed.The breakdown detection systems validated protected antennas.The use of combination Lower Hybrid...
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 Collective Thomson Scattering (CTS) diagnostics measure the scattering spectrum of monochromatic incident radiation off collective fluctuations in plasma. In this contribution, we present first results from upgraded CTS diagnostic at Wendelstein 7-X (W7-X) operating frequency range between 172 and 176 GHz. This allows for minimization noise originating electron cyclotron emission Consequently, good signal-to-noise ratio measurements fast ions or bulk plasma parameters with higher...
The present paper offers an overview of the potential ion cyclotron resonance heating (ICRH) or radio frequency for DEMO machine. It is found that various suitable schemes are available. Similar to ITER and in view limited bandwidth about 10 MHz can be achieved ensure optimal functioning launcher, it proposed make core second harmonic tritium key scheme, assisted by fundamental 3He early phase discharge; design DEMO—with a static magnetic field strength Bo = 5.855 T—that places T layers f 60...
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...
Ion temperatures of over 100 million degrees need to be reached in future fusion reactors for the deuterium–tritium reaction work. cyclotron resonance heating (ICRH) is a method that has capability directly heat ions such high temperatures, via resonant interaction between plasma and radiofrequency waves launched plasma. This paper gives an overview recent developments this field. In particular novel recently developed three-ion scenario will highlighted. It flexible scheme with potential...
Travelling Wave Array (TWA) antennas distributed along the periphery of tokamak are presently considered as Ion Cyclotron Resonance Frequencies (ICRF) heating solution for DEMO reactor. Compared to conventional ICRF antenna systems currently in use or designed future machines like ITER, TWA consists sections integrated breeding blanket scattered around machine, each one fed through a variable coupler resonant ring configuration. Previous modelling an system with 16 quadruple 8 straps shows...
Two ion cyclotron resonance heating (ICRH) systems are planned for ITER, each system containing 24 antennas distributed as a two by four array of poloidal triplets. The ITER designed to operate at phase difference between the upper and lower triplet in antenna currents. Since current tokamak experiments normally , experience from ICRH schemes with is lacking. In this paper, effects phasing on power absorption coupling studied using novel code FEMIC, which described here. Simulations JET...
An upgraded version of the fast semi-analytical code ANTITER is used to model refueled TWA sections any arbitrary number straps facing a low coupling plasma profile. The computes Y, Z and S matrices antenna array from which performances their feeding system are deduced as function geometry TWA. incorporates section by resonant ring circuit recirculating output power each section. Approximate scaling laws guiding design derived for main parameters. A first optimization DEMO made resulting...
Abstract Electron- (ECWC) and ion- (ICWC) cyclotron wall conditioning are essential means for controlled fusion to modify the surface state of plasma-facing components in order reduce impurity generation fuel accumulation wall. Development ECWC ICWC requires characterization neutral particle fluxes generated discharges, because neutrals enhance homogeneity conditioning, which may contribute remote or shadowed areas, especially presence a permanent magnetic field (e.g. W7-X, ITER). A...
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...
Abstract This paper presents the current status of WEST TWA antenna, its mock-up and a possible extrapolation to DEMO. The updated design has reduced antenna length features feeding mechanical support from single vessel port. A was designed in 2019, manufactured during 2020 installed TITAN test facility at beginning 2021. results low high power, diagnostic system prospects are explained. Extensions towards for future DEMO tokamak reactor briefly discussed.
This paper proposes a Traveling Wave Antenna for ICRH heating of T-15MD located below the equatorial plane tokamak operation at 60MHz. Resonant ring feeding allows recirculation RF power that is not radiated to plasma and termination TWA section in its iterative impedance. The describes antenna design, tuning algorithm expected performances this concept. chosen geometry sections compatible with future reactor therefore system also represents test bed DEMO.
Different feeding options for distributed ICRF antenna systems in DEMO are analysed and compared, based on detailed circuit modelling. Voltages currents (amplitude phase) computed each element of the array. The power delivered by networks is evaluated characterizing system. Although results presented a small number radiating elements, procedure can be scaled to any arbitrary straps connections. Among three (i.e. allfed; distributed; resonant ring) ring appears most suitable configuration...