Y. Feng
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View article: Neural network-based surrogate model for 3D edge-plasma transport in the standard configuration of W7-X
Neural network-based surrogate model for 3D edge-plasma transport in the standard configuration of W7-X Open
This paper presents a neural‐network surrogate model for Wendelstein 7-X (W7-X) edge transport simulations, trained on an EMC3-EIRENE dataset that spans nearly the entire operating-parameter space currently explored in the W7-X standard co…
View article: Study of radial field dependent flows in inboard limited Aditya-U plasmas using EMC3-Eirene simulations
Study of radial field dependent flows in inboard limited Aditya-U plasmas using EMC3-Eirene simulations Open
The intrinsically generated plasma rotation in magnetically confined tokamak plasmas has implications for a number of edge and core phenomena. In recent Aditya-U tokamak circular plasma discharges with plasma current of range (142–170) kA,…
View article: Integrated simulation of the impacts of resonant magnetic perturbations on tungsten radiation on EAST
Integrated simulation of the impacts of resonant magnetic perturbations on tungsten radiation on EAST Open
A significant reduction of 70% in tungsten (W) radiation intensity has been experimentally observed under resonant magnetic perturbation (RMP) fields on the EAST tokamak. To study the reduction in W radiation during RMP application, dedica…
View article: A Bayesian framework for genome-wide circadian rhythmicity biomarker detection
A Bayesian framework for genome-wide circadian rhythmicity biomarker detection Open
Circadian rhythms are endogenous $\sim $24-h cycles that significantly influence physiological and behavioral processes. These rhythms are governed by a transcriptional–translational feedback loop of core circadian genes and are essential …
View article: Multi-X-point radiation and its dynamics in up/down asymmetry in plasma detachment regimes in Wendelstein 7-X
Multi-X-point radiation and its dynamics in up/down asymmetry in plasma detachment regimes in Wendelstein 7-X Open
In Wendelstein 7-X (W7-X), stable plasma detachment in ECRH hydrogen plasmas is routinely achieved with the standard magnetic configuration, containing five magnetic islands in the scrape-off layer (SOL). Plasma detachment induced by intri…
View article: A neural network-based method for input parameter optimization of edge transport modeling utilizing experimental diagnostics
A neural network-based method for input parameter optimization of edge transport modeling utilizing experimental diagnostics Open
A neural network–based method is developed to fast optimize EMC3-EIRENE input parameters, enabling EMC3-EIRENE to produce synthetic data that closely match experimental measurements on Wendelstein 7-X (W7-X). Initially, an EMC3-EIRENE simu…
View article: Exploring Gain/Pain Share Mechanisms for Carbon Emission Reduction in the Australian Construction Industry: A Scoping Review
Exploring Gain/Pain Share Mechanisms for Carbon Emission Reduction in the Australian Construction Industry: A Scoping Review Open
This study investigates the application of gain/pain share mechanisms to incentivize carbon emission reductions in the Australian construction industry, addressing a critical gap in sustainable construction practices. The research employs …
View article: Institutional Innovation in the Context of Ecological Civilization Construction: A Study on the Concession of Giant Panda National Park
Institutional Innovation in the Context of Ecological Civilization Construction: A Study on the Concession of Giant Panda National Park Open
The national park franchise system is an important management mechanism for the government to authorize the recipients to carry out non-resource-consuming business activities through the competition mechanism, aiming to balance ecological …
View article: A novel method for treating MAR in EMC3-Eirene, and first applications to W7-X
A novel method for treating MAR in EMC3-Eirene, and first applications to W7-X Open
This paper presents a novel ‘prediction-correction method’ for treating molecule-assisted recombination (MAR) in the three-dimensional (3D) boundary plasma transport code—EMC3-Eirene. In this approach, certain MAR products are first isolat…
View article: Experimental and numerical investigation of wavelength and resolution dependency of dynamic optical coherence tomography signals
Experimental and numerical investigation of wavelength and resolution dependency of dynamic optical coherence tomography signals Open
The wavelength and system-resolution dependencies of dynamic optical coherence tomography (DOCT) are investigated experimentally and numerically. Experimental investigations demonstrate significant wavelength dependency for the DOCT values…
View article: Magnetic mesh generation and field line reconstruction for scrape-off layer and divertor modeling in stellarators
Magnetic mesh generation and field line reconstruction for scrape-off layer and divertor modeling in stellarators Open
The design of divertor targets and baffles for optimal heat and particle exhaust from magnetically confined fusion plasmas requires a combination of fast, low-fidelity models (such as EMC3-Lite (Feng 2022 Plasma Phys. Control. Fusion 64 12…
View article: Improved Coulomb collision operator for kinetic ion transport with EMC3-EIRENE simulating Nitrogen seeding in medium density ITER L-mode scenario
Improved Coulomb collision operator for kinetic ion transport with EMC3-EIRENE simulating Nitrogen seeding in medium density ITER L-mode scenario Open
Previous simulations with the kinetic ion transport module of EMC3-EIRENE for Nitrogen seeding in a medium density ITER L-mode scenario showed that the currently simplified Coulomb collision model of EIRENE leads to a strongly overestimate…
View article: Investigating the role of divertor geometry on density build-up in the island divertor
Investigating the role of divertor geometry on density build-up in the island divertor Open
The island divertor has been proposed for power and particle exhaust in stellarators. It is investigated in the Wendelstein 7-X (W7-X) experiment. The divertor capabilities such as particle exhaust or radiative power dissipation scale with…
View article: Integrated modelling of lithium transport and radiation under a liquid lithium divertor on EAST
Integrated modelling of lithium transport and radiation under a liquid lithium divertor on EAST Open
The edge transport and core accumulation of lithium (Li) impurity under a liquid Li divertor on EAST have been investigated by the EMC3-EIRENE and STRAHL codes, respectively. At the edge region, the Li density distribution and power dissip…
View article: Investigation of island size effect on radiation distribution during attached and detached plasmas in the island divertor of W7-X
Investigation of island size effect on radiation distribution during attached and detached plasmas in the island divertor of W7-X Open
View article: Wearable Fabric System for Sarcopenia Detection
Wearable Fabric System for Sarcopenia Detection Open
Sarcopenia has been a serious concern in the context of an increasingly aging global population. Existing detection methods for sarcopenia are severely constrained by cumbersome devices, the necessity for specialized personnel, and control…
View article: Echo: Simulating Distributed Training At Scale
Echo: Simulating Distributed Training At Scale Open
Simulation offers unique values for both enumeration and extrapolation purposes, and is becoming increasingly important for managing the massive machine learning (ML) clusters and large-scale distributed training jobs. In this paper, we bu…
View article: Numerical modeling of impurity powder injection in W7-X
Numerical modeling of impurity powder injection in W7-X Open
In this work, we present numerical simulation results of powder injection in W7-X using the EMC3-EIRENE and DIS codes. First, we model powder injection experiments performed in W7-X with the Probe Mounted Powder Injector. The simulation re…
View article: Integrated modeling of boron powder injection for real-time plasma-facing component conditioning
Integrated modeling of boron powder injection for real-time plasma-facing component conditioning Open
An integrated modeling framework for investigating the application of solid boron (B) powder injection for real-time surface conditioning of plasma-facing components (PFCs) in tokamak environments is presented. Utilizing the DIII-D impurit…
View article: Data and figures for "Integrated modeling of boron powder injection for real-time plasma-facing component conditioning"
Data and figures for "Integrated modeling of boron powder injection for real-time plasma-facing component conditioning" Open
This dataset contains raw and processed data, as well as supplementary figures used in the paper titled "Integrated modeling of boron powder injection for real-time plasma-facing component conditioning." The data includes simulation result…
View article: A universal target plate design scheme for stellarators: theoretical basis and its application to heat load control
A universal target plate design scheme for stellarators: theoretical basis and its application to heat load control Open
This study introduces a novel divertor target design scheme for stellarators, grounded in mathematical treatments and tailored to control of toroidal heat load distributions. Initially, a differential equation characterizing toroidally uni…
View article: First experimental confirmation of island SOL geometry effects in a high radiation regime on W7-X
First experimental confirmation of island SOL geometry effects in a high radiation regime on W7-X Open
This work characterizes the detachment behavior and radiation characteristics of the low iota configuration in the Wendelstein 7-X (W7-X) stellarator. The island scrape-off layer (SOL) of the low iota has a poloidal mode number of six isla…
View article: A semi-automated algorithm for designing stellarator divertor and limiter plates and application to HSX
A semi-automated algorithm for designing stellarator divertor and limiter plates and application to HSX Open
We present a semi-automated algorithm for designing three-dimensional divertor or limiter plates targeting low heat loads. The algorithm designs the plates in two stages: Firstly, the parallel heat flux distribution is caught on vertically…
View article: Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components
Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components Open
After a long device enhancement phase, scientific operation resumed in 2022. The main new device components are the water cooling of all plasma facing components and the new water-cooled high heat flux divertor units. Water cooling allowed…
View article: Off-target gradient-driven flows in 3D simulations of ADITYA-Upgrade tokamak scrape-off layer plasma transport
Off-target gradient-driven flows in 3D simulations of ADITYA-Upgrade tokamak scrape-off layer plasma transport Open
Coupled plasma-neutral transport simulations are performed on ADITYA-Upgrade tokamak scrape-off layer (SOL) plasma, where flows in the core and SOL were measured to reverse signs with density variation. The simulations performed using the …
View article: Integrated modeling of boron powder injection for real-time plasma-facing component conditioning
Integrated modeling of boron powder injection for real-time plasma-facing component conditioning Open
An integrated modeling framework for investigating the application of solid boron powder injection for real-time surface conditioning of plasma-facing components in tokamak environments is presented. Utilizing the DIII-D impurity powder dr…
View article: Conditions and benefits of X-point radiation for the island divertor
Conditions and benefits of X-point radiation for the island divertor Open
We present a method to geometrically quantify the three magnetic island chains with the poloidal mode numbers m = 4, 5, and 6 (referred to in this paper as high-iota, standard, and low-iota islands, respectively), on which the W7-X diverto…
View article: Heat and particle exhaust in high-performance plasmas in Wendelstein 7-X
Heat and particle exhaust in high-performance plasmas in Wendelstein 7-X Open
The paper reports for the first time the heat and particle exhaust at the plasma boundary through various edge diagnostics for the high-performance plasma obtained after pellet injection on Wendelstein 7-X. The plasma density at the edge i…
View article: Heuristic predictions of RMP configurations for ELM suppression in ITER burning plasmas and their impact on divertor performance
Heuristic predictions of RMP configurations for ELM suppression in ITER burning plasmas and their impact on divertor performance Open
A subspace of resonant magnetic perturbation (RMP) configurations for edge localized mode (ELM) suppression is predicted for H-mode burning plasmas at 15 MA current and 5.3 T magnetic field in ITER. Perturbations to the core plasma can be …
View article: Discovery of Very-high-energy Gamma-ray Emissions from the Low Luminosity AGN NGC 4278 by LHAASO
Discovery of Very-high-energy Gamma-ray Emissions from the Low Luminosity AGN NGC 4278 by LHAASO Open
The first source catalog of Large High Altitude Air Shower Observatory reported the detection of a very-high-energy gamma ray source, 1LHAASO J1219+2915. In this paper a further detailed study of the spectral and temporal behavior of this …