A5066568170- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Gyrotron and Vacuum Electronics Research
- Fusion materials and technologies
- Ionosphere and magnetosphere dynamics
- Antenna Design and Analysis
- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Electromagnetic Launch and Propulsion Technology
- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Electromagnetic Scattering and Analysis
- Electromagnetic Simulation and Numerical Methods
- Metal and Thin Film Mechanics
- Nuclear reactor physics and engineering
- Electromagnetic Compatibility and Measurements
- Laser-induced spectroscopy and plasma
- Muon and positron interactions and applications
- Energy Harvesting in Wireless Networks
- Antenna Design and Optimization
- Soil Moisture and Remote Sensing
- Electrostatic Discharge in Electronics
- Dust and Plasma Wave Phenomena
CEA Cadarache
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
Institut de Recherche sur la Fusion par Confinement Magnétique
2015-2024
Institute of Plasma Physics
2011-2022
Chinese Academy of Sciences
2011-2022
Southwestern Institute of Physics
2011-2020
Southwest Jiaotong University
2020
Royal Military Academy
2020
Plasma Technology (United States)
2016
Fusion Academy
2016
With WEST (Tungsten Environment in Steady State Tokamak) (Bucalossi et al 2014 Fusion Eng. Des. 89 907–12), the Tore Supra facility and team expertise (Dumont Plasma Phys. Control. 56 075020) is used to pave way towards ITER divertor procurement operation. It consists implementing a configuration installing ITER-like actively cooled tungsten monoblocks tokamak, taking full benefit of its unique long-pulse capability. user platform, open all partners. This paper describes physics basis WEST:...
The demand for a predictive tool to help in designing ion-cyclotron radio frequency (ICRF) antenna systems today's fusion experiments has driven the development of codes such as ICANT, RANT3D, and early TOPICA (TOrino Polytechnic Ion Cyclotron Antenna) code. This paper describes substantive evolution formulation implementation that presently allow it handle actual geometry ICRF antennas (with curved, solid straps, general-shape housing, Faraday screen, etc) well an accurate plasma...
A 20 MW/5 GHz lower hybrid current drive (LHCD) system was initially due to be commissioned and used for the second mission of ITER, i.e. Q = 5 steady state target. Though not part currently planned procurement phase, it is now under consideration an earlier delivery. In this paper, both physics technology conceptual designs are reviewed. Furthermore, appropriate work plan also developed. This design, R&D, installation a MW LHCD on ITER follows Scientific Technical Advisory Committee...
The Advanced LOwer Hybrid Antenna (ALOHA) code, has been developed to improve the modelling of coupling lower hybrid (LH) waves from antenna a cold inhomogeneous plasma while keeping fast tool. In contrast previous code Slow Wave ANtenna (SWAN) (that only described interaction slow wave between waveguides and in 1D model), equations are now solved 2D including contribution both waves, with low computational cost. This approach is completed either by full-wave computation that takes into...
With the rapid proliferation of telecommunication and RF applications, so, too, has demand grown for tools to design characterize these devices. scikit-rf is a Python package designed make RF/microwave engineering both robust approachable. The provides modern, object-oriented library network analysis, circuit building, calibration, simulation.
A detailed study of lower hybrid current drive (LHCD) in ITER is provided, focusing on the wave propagation and mechanisms. combination ray-tracing Fokker–Planck calculations are presented for various plasma scenarios, frequency polarization. The dependence driven location power deposition upon coupled spectrum systematically determined, order to set objectives antenna design. respective effects finite-power levels, magnetic trapping, spectra accounted quantitatively estimated. sensitivity...
A minimal two-field fluid approach is followed to describe the radio-frequency (RF) wave propagation in bounded scrape-off layer plasma of magnetic fusion devices self-consistently with direct current (DC) biasing this plasma. The RF and DC parts are coupled by non-linear sheath boundary conditions at both ends open field lines. physical model studied within a simplified framework featuring slow (SW) only lateral walls normal straight confinement field. possibility however kept excite system...
A 4.6 GHz lower-hybrid current drive (LHCD) system has been firstly commissioned in EAST the 2014 campaign. The first LHCD results with show that LHW can be coupled to plasma a low reflection coefficient, and rotation, modify profile, heat effectively. By means of configuration optimization local gas puffing near antenna, good LHW–plasma coupling coefficient less than 5% is obtained. maximum power up 3.5 MW. (CD) efficiency 1.1 × 1019 m−2 W−1 central electron temperature above 4 keV,...
Abstract The full W environment that is now foreseen for ITER puts strong emphasis on experimental results obtained in present devices similar conditions. In this context, the WEST tokamak well equipped to bring key contributions preparation of operation, thanks its capability perform long pulses dominant electron heating, torque-free scheme based RF systems, and ITERgrade actively cooled divertor. Recent interest cover understanding tungsten contamination evaluation conditioning methods,...
A new ITER-relevant lower hybrid current drive (LHCD) launcher, based on the passive-active-multijunction (PAM) concept, was brought into operation Tore Supra tokamak in autumn 2009. The PAM launcher concept designed view of ITER to allow efficient cooling waveguides, as required for long pulse operation. In addition, it offers low power reflection close cut-off density, which is very attractive ITER, where large distance between plasma and wall may bring density front values. first...
First principle modeling of the lower hybrid (LH) current drive in tokamak plasmas is a longstanding activity, which gradually gaining accuracy thanks to quantitative comparisons with experimental observations. The ability reproduce simulatenously plasma and non-thermal bremsstrahlung radial profiles hard x-ray (HXR) photon energy range represents this context significant achievement. Though subject limitations, ray tracing calculations are commonly used for describing wave propagation...
EAST has been equipped with two high power lower hybrid current drive (LHCD) systems operating frequencies of 2.45 GHz and 4.6 GHz. Comparative LHCD experiments the different were performed in same conditions plasma for first time. It was found that (CD) efficiency heating effect are much better LH waves than one High confinement mode (H-mode) discharges as sole auxiliary source have obtained is higher respect to produced previously by A combination ray-tracing Fokker-Planck calculations...
Abstract As part of ITPA-Integrated Operational Scenario activities, this contribution reviews recent experimental characterizations radio-frequency (RF)-induced scrape-off layer (SOL) modifications various tokamaks worldwide and the LArge Plasma Device at UCLA. The phenomenology, as observed using a large variety measurement techniques, is consistent with expectations from RF sheath rectification. Emphasis then put on complex three-dimensional (3D) spatial patterns RF–SOL interaction, in...
Extensive experimental data support reliable power deposition and current drive by lower-hybrid (LH) waves in conditions where a large spectral gap exists between the nominal parallel index of refraction prescribed antenna characteristics phasing, that required for significant Landau damping to take place. We argue only modification initial spectrum at plasma edge could explain observations. Based on this assumption, new prescription simulations LH using ray-tracing Fokker-Planck modelling...
Abstract This paper reports a new numerical scheme to simulate the radio-frequency (RF) induced RF sheath, which is suitable for large 3D simulation. In sheath boundary model, tangential component of electric field ( <?CDATA $E_\mathrm{t}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>E</mml:mi> <mml:mrow> <mml:mi mathvariant="normal">t</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) given by gradient scalar potential. We introduce two...
Lower hybrid current drive (LHCD) experiments with line-averaged density varying between 1.5 × 1019 and 6 m−3 are performed on the Tore Supra tokamak under quasi-steady-state conditions respect to fast electron dynamics. The LHCD efficiency is analysed from bremsstrahlung (FEB) cyclotron emission (ECE). effect of plasma equilibrium particle fuelling documented. It concluded that decay FEB could be consistent simple scaling FEB. Plasma edge measurements presented looking for emission. In a...
A novel method to simulate ion cyclotron wave coupling in the edge of a tokamak plasma with finite element technique is presented. It applied commercial software COMSOL Multiphysics. Its main features include perfectly matched layer (PML) emulate radiating boundary conditions beyond critical cutoff for fast (FW), full-wave propagation across inhomogeneous cold peripheral and detailed description launcher geometry. The PML technique, while widely used numerical simulations propagation, has...
Radio-frequency (RF) systems used in vacuum can be damaged by electronic avalanches triggered the multipactor effect. This undesirable phenomenon appear for RF components space communication payloads as well experimental fusion devices, among others. To determine breakdown threshold, expensive tests made or simulations performed. second method uses Total Electron Emission Yield (TEEY) curve input and threshold predicted simulation highly depends on this curve. Consequently we decided to make...
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...
Lower hybrid current drive (LHCD) experiments performed at a density close to that required for the steady-state (SS) scenario are reported. On C-Mod, FTU and Tore Supra, strong decay of bremsstrahlung emission is observed when increased, much faster prediction LHCD modelling. JET, LH power deposition also found be sensitive plasma density: modulation indicates moves very edge (r/a ∼ 0.9) approaches requirement JET SS scenario. From this experiment but from reconstruction electron cyclotron...
A new concept of lower hybrid antenna for current drive has been proposed ITER (Bibet et al 1995 Nucl. Fusion 35 1213–23 ): the passive active multijunction (PAM) that relies on a periodic combination and waveguides. An actively cooled PAM at 3.7 GHz recently installed tokamak Tore Supra. This paper summarizes comprehensive experimental characterization coupling properties to Supra plasmas. In this paper, electromagnetic are measured reduced power (<1 MW) allow systematic comparison with...
Abstract To achieve steady-state operation on future fusion devices, in particular ITER, the coupling of lower hybrid wave must be optimized a wide range edge conditions. However, under some specific conditions, deleterious effects current drive (LHCD) are sometimes observed Tore Supra. In this way, dedicated LHCD experiments have been performed using system Supra, composed two different conceptual designs launcher: fully active multi-junction (FAM) and new passive (PAM) antennas. A...