A5103078852- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Diamond and Carbon-based Materials Research
- Nuclear reactor physics and engineering
- High-Energy Particle Collisions Research
- Advanced materials and composites
- Dust and Plasma Wave Phenomena
- Advanced optical system design
- Economic and Environmental Valuation
- Optical Polarization and Ellipsometry
- Powder Metallurgy Techniques and Materials
- Liquid Crystal Research Advancements
- Radio Astronomy Observations and Technology
- GNSS positioning and interference
- Advanced Optical Imaging Technologies
- Advancements in Photolithography Techniques
- Full-Duplex Wireless Communications
- Atomic and Subatomic Physics Research
Chinese Academy of Sciences
2014-2025
Hefei Institutes of Physical Science
2021-2025
Institute of Plasma Physics
2012-2024
Max Planck Institute for Plasma Physics
2015-2023
Taiyuan University of Technology
2023
Max Planck Society
2015-2021
Lodestar Research Corporation (United States)
2020
Ghent University
2016-2019
Eurogentec (Belgium)
2016
University of Saskatchewan
1993-2015
A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with linear electromagnetic TOPICA calculations is presented.The substantiates a reduction local electric field at radially protruding plasma-facing elements as relevant approach for minimizing tungsten (W) sputtering in conditions when slow wave strongly evanescent.The measured reaction time-averaged RF current limiters to feeding variations less sensitive than predicted by calculations.This likely have been caused temporal and...
A detailed cross-device investigation on the role of filamentary dynamics in high-density regimes has been performed within EUROfusion framework, comparing ASDEX Upgrade (AUG) and TCV tokamaks. Both devices run density ramp experiments at different levels plasma current, keeping toroidal field or q95 constant order to disentangle parallel connection length current. During scan a field, both scrape-off layer (SOL) profiles tend develop clear SOL shoulder lower edge whenever current is...
Abstract Ion Cyclotron Range of Frequencies (ICRF) heating and Neutral Beam Injection (NBI) can have synergy due to the acceleration NBI beam ions by ICRF wave fields at their harmonics. To understand influence ICRF-NBI on fast ion distribution plasma performance, dedicated experiments TRANSP simulations been carried out EAST. The simulation results are consistent with experimental results. They show that not only accelerates energy lower than 80 keV larger 300 keV, but also generates fusion...
Magnetic reconnection plays a fundamental role in transporting energy, momentum, and plasma from the solar wind to magnetosphere-ionosphere system. During an IMF southward turning, magnetopause X-line forms near magnetic equator region is considered drive dayside convection However, how azimuthal size of flows at ionosphere relate each other, what mechanisms control flow remain unclear. In this study, we use global ideal MHD simulation address question using event during turning. The results...
Last decade has seen greatly intensified interest in understanding the temperature evolution Holocene (~last 10,000 years), which provides background climate for our ongoing anthropogenic global warming.  Much of effort so far focused on mean annual (MAT). The called conundrum still remains unresolved: MAT exhibited a cooling trend as indicated most proxy reconstructions, or warming response to increased concentration greenhouse gases and retreating ice sheet models. Here, we...
Abstract Ion cyclotron resonance heating (ICRH) plays a crucial role in magnetic confinement nuclear fusion, enhancing plasma temperature and enabling sustained fusion reactions. Full wave simulations the ion range of frequency (ICRF) are essential for exploring mechanisms guiding experiments. This paper focuses on development application finite element method (FEM) based full simulation code, INTFLUK, which incorporates poloidal field to account up down shift effect parallel number. The...
Recent achievements in studies of the effects ICRF (Ion Cyclotron Range Frequencies) power on SOL (Scrape-Off Layer) and PWI (Plasma Wall Interactions) ASDEX Upgrade (AUG), Alcator C-Mod, JET-ILW are reviewed. Capabilities to diagnose model effect DC biasing associated impurity production at active antennas magnetic field connections described. The experiments show that near-fields can lead not only E × B convection, but also modifications density, which for C-Mod limited a narrow region...
Abstract Experiments have been performed under the coordination of International Tokamak Physics Activity (ITPA) on several tokamaks, including ASDEX Upgrade (AUG), JET and DIII-D, to characterize increased Ion cyclotron range frequency (ICRF) antenna loading achieved by optimizing position gas injection relative RF antennas. On AUG (with ITER-Like Wall) a 50% increase in was observed when injecting deuterium ELMy H-mode plasmas using mid-plane inlets close powered antennas instead divertor...
Abstract In recent experiments, a local gas puff was found to be an effective way tailor the scrape-off layer (SOL) density and improve ion cyclotron range of frequency (ICRF) power coupling in tokamaks. order quantitatively reproduce these understand corresponding physics optimize valve positions rates, simulations were carried out with 3D edge plasma transport code EMC3-EIRENE ASDEX Upgrade. An inter-ELM phase H-mode discharge moderate rate (1.2 × 10 22 electrons s −1 ) is used our...
In Ohmic heated low confinement mode (L-mode) discharges, the intermittent statistical characteristics of turbulent fluctuations have been investigated in edge and scrape-off layer (SOL) plasma on EAST (the experimental advanced superconducting tokamak) by fast reciprocating Langmuir probe measurements. Plasma structures (blobs holes) are observed found to originate together inside shear where skewness (S) ion-saturation current is close zero. The probability density functions SOL show a...
Abstract The Chinese Fusion Engineering Testing Reactor (CFETR) plans to use an ITER-type antenna and couple ∼30 MW ion cyclotron range of frequencies (ICRF) power the plasma. In this paper, physical design a CFETR in midplane port is carried out. Parameter scans were performed study optimized toroidal poloidal numbers straps as well geometric sizes straps. coupling resistance, spectrum, maximum voltage resonant transmission line strap parallel electric field vicinity are used determine...
Abstract The power threshold for low (L) to high (H) confinement mode transition achieved by radio-frequency (RF) heating and lithium-wall coating is investigated experimentally on EAST two sets of walls: an all carbon wall (C) molybdenum chamber a divertor (Mo/C). For both walls, minimum P thr ~0.6 MW was found when the operates in double null (DN) configuration with intensive coating. When operating upper single (USN) or lower (LSN), depends ion ∇ B drift direction. density dependence L–H...
The fast electron flux driven by Lower Hybrid Wave (LHW) in the scrape-off layer (SOL) EAST is analyzed both theoretically and experimentally. five bright belts flowing along magnetic field lines SOL hot spots at LHW guard limiters observed charge coupled device infrared cameras are attributed to flux, which directly measured retarding analyzers (RFA). current carried ranging from 400 6000 A/m2 direction opposite plasma current, scanned radial limiter surface position about 25 mm beyond...
Linear properties of the toroidal Alfvén eigenmode (TAE) excited by energetic particles (EP) in a DIII-D tokamak experiment have been studied global gyrokinetic particle simulations treating self-consistently kinetic effects EP, thermal ions, and electrons. Simulation results TAE frequency mode structure agree very well with experimental measurements. The non-perturbative EP contribution induces radial localization structure, break-down symmetry, as dependence on number. further demonstrate...
The coupling of ion cyclotron range frequencies (ICRF) power to the plasma depends critically on scrape-off layer (SOL) density since fast wave is evanescent below cut-off density. ICRF can be improved by increasing SOL locally in front antenna means local gas puffing/fueling. To understand influence puffing and find optimized valve positions maximize ITER, 3D code EMC3-EIRENE used calculate density, codes ANTITER FELICE are then resistances. Purely deuterium simulated total puff rate for...
Abstract Bursts of ion cyclotron emission (ICE), with spectral peaks corresponding to the hydrogen harmonic frequencies in plasma core are detected from helium plasmas heated by sub-Alfvénic beam-injected ions ASDEX Upgrade tokamak. Based on fast distribution function obtained TRANSP/NUBEAM code, together a linear analytical theory magnetoacoustic instability (MCI), growth rates MCI could be calculated. In our theoretical and experimental studies, we found that excitation mechanism ICE...
In magnetic controlled fusion devices, plasma heating with radio-frequency (RF) waves in the ion cyclotron (IC) range of frequency relies on electric field fast wave to heat plasma. However, slow can be generated parasitically. The induce large biased potential (DC potential) through sheath rectification. rapid variation rectified across equilibrium cause significant convective transport (E × B drifts) scrape-off layer (SOL). order understand this phenomenon and reproduce experiments, 3D...
At density filaments in magnetized plasmas, electromagnetic waves are guided along the filament (“wave-filament bound states”). Several wave-filament states exist beyond those predicted by Myra and D'Ippolito [Phys. Plasmas 17, 102510 (2010)]. The new occur under experimentally relevant conditions especially common typical NSTX conditions, where they a plausible mechanism for observed power losses edge plasma.
Abstract This paper summarizes recent progress in modeling the interaction between ion cyclotron range of frequency (ICRF) waves and edge plasma with application to ASDEX Upgrade. The basic theories, development ICRF codes, integrated methods some key results are reviewed. In particular, following physical aspects discussed: (1) power coupling; (2) slow wave propagation; (3) ICRF-rectified sheath; (4) ICRF-induced convection; (5) ICRF-edge turbulence interaction. Moreover, comprehensive...
A new model for the low-to-high ($L\text{\ensuremath{-}}H$) confinement transition has been developed based on a paradigm turbulence suppression by velocity shear [G. M. Staebler et al., Phys. Rev. Lett. 110, 055003 (2013)]. The indicates that $L\text{\ensuremath{-}}H$ can be mediated shift in radial wave number spectrum of turbulence, as evidenced here, first time, direct observation spectral and structure tilting prior to at tokamak edge probing. This mechanism does not require...
Recent JET (ITER-Like Wall) experiments have shown that the fueling gas puffed from different locations of vessel can result in scrape-off layer (SOL) density profiles and therefore radio frequency (RF) coupling. To reproduce experimental observations, to understand associated physics optimize puff methods, we carried out three-dimensional (3D) simulations with EMC3-EIRENE code JET-ILW including a realistic description geometry injection modules (GIMs) configuration. Various puffing methods...
Use of new 3-strap ICRF antennas with all-tungsten (W) limiters in ASDEX Upgrade results a reduction the W sources at antenna and content confined plasma by least factor 2 compared to W-limiter 2-strap used past. The is observed broad range shapes. In multiple locations frame, limiter source has minimum when RF image currents are decreased cancellation current contributions central outer straps. JET ITER-like wall, produces about 20% less main chamber radiation old A2 antennas. However...
Abstract ICRF antenna development for DEMO the pre-conceptual phase is carried out by merging existing knowledge about multi-strap ITER, JET and ASDEX upgrade antennas. Many aspects are taken over adapted to DEMO, including mechanical design RF performance optimization strategies. The minimization of ICRF-specific plasma-wall interactions aimed at optimizing feeding power balance, a technique already proven in practice. Technological limits elaborated components ITER system serve as...
Abstract The scattering of waves in the ion cyclotron range by plasma density perturbations edge has been previously studied Zhang et al with help antenna code RAPLICASOL (2020, Nucl. Fusion , 60 096001). further interesting question is whether have an effect on resonance heating (ICRH) core. In this paper, finite element method based 2D full wave integrating core used to study issue. analytical are applied influence field distribution, power deposition, coupling, partition among different...