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View article: Turbulence simulations of drift-Alfvén wave effects on edge-localized modes and divertor target heat flux width
Turbulence simulations of drift-Alfvén wave effects on edge-localized modes and divertor target heat flux width Open
A series of BOUT++ turbulence simulations are performed for two Pre-Fusion Power Operation (PFPO-1,2) phases of the ITER Research Plan proclaimed in 2019. Linear simulation results show that PFPO-1 is unstable to peeling–ballooning modes (…
View article: Exploring the transition from continuous turbulence fluctuations to bursting ELMs in high SOL density regimes
Exploring the transition from continuous turbulence fluctuations to bursting ELMs in high SOL density regimes Open
BOUT++ turbulence simulations of the DIII-D reveal that the density profile between the separatrix and pedestal plays a crucial role in the dynamics of edge localized modes (ELMs) and edge plasma turbulent transport. Nonlinear simulations …
View article: Fluctuation entrainment and SOL width broadening in small/grassy ELM regime
Fluctuation entrainment and SOL width broadening in small/grassy ELM regime Open
This study delves into the phenomena of fluctuation within the Scrape-Off Layer (SOL) of tokamak fusion reactors, with a specific focus on its impact on SOL width, particularly during grassy Edge Localized Modes (ELMs). Employing a compreh…
View article: Edge-localized mode mitigation enabled by active control of pedestal density gradient with new EAST tokamak divertor
Edge-localized mode mitigation enabled by active control of pedestal density gradient with new EAST tokamak divertor Open
Mitigation of large edge-localized modes (ELMs) has been achieved by actively reducing the pedestal density gradient with the EAST new right-angled lower divertor through changing the strike point position from the vertical target to the h…
View article: A metal-wall compatible high-confinement tokamak plasma regime for fusion energy
A metal-wall compatible high-confinement tokamak plasma regime for fusion energy Open
The international thermonuclear experimental reactor (ITER) is now considering to use tungsten as the material for plasma-facing components (PFCs) [1] and operate in the so-called high-confinement mode (H-mode) [2]. Heat pulse eruptions ca…
View article: <scp>HL</scp>‐<scp>2A</scp>'s <scp>ELM</scp> cycle simulations by integrating <scp>BOUT</scp>++'s drift <scp>MHD</scp> and transport code
<span>HL</span>‐<span>2A</span>'s <span>ELM</span> cycle simulations by integrating <span>BOUT</span>++'s drift <span>MHD</span> and transport code Open
A new integrating model has been developed to couple tokamak edge multiscale magnetohydrodynamic (MHD) events and transport simulations, such as edge‐localized mode (ELM) cycles. As a proof of principle, we first start from a set of three‐…
View article: Characterization of SOL profiles and turbulence in ICRF-heated plasmas in EAST
Characterization of SOL profiles and turbulence in ICRF-heated plasmas in EAST Open
Scrape-off layer (SOL) profiles and turbulence in ion cyclotron range of frequency (ICRF)-heated plasmas are investigated by the reciprocating probe diagnostic system (FRPs) and gas puff imaging (GPI) diagnostic in EAST. A radio-frequency …
View article: Turbulence spreading effects on the ELM size and SOL width
Turbulence spreading effects on the ELM size and SOL width Open
BOUT++ turbulence simulations were performed to investigate the impact of turbulence spreading on the edge localized mode (ELM) size and divertor heat flux width $({\lambda _q})$ broadening in small ELM regimes. This study is motivated by …
View article: Simulation of the impact of particle recycling on the plasma in <scp>MPS‐LD</scp> device based on the <scp>BOUT</scp>++ <scp>LPD</scp> module
Simulation of the impact of particle recycling on the plasma in <span>MPS‐LD</span> device based on the <span>BOUT</span>++ <span>LPD</span> module Open
A linear plasma device (LPD) module has been developed under the BOUT++ framework to simulate plasma transport in the MPS‐LD. However, previously, the LPD module used a simplistic neutral particle model that only includes particle density …
View article: How fluctuation intensity flux drives SOL expansion
How fluctuation intensity flux drives SOL expansion Open
Predictions of heat load widths based on particle orbits alone are very pessimistic. This paper shows that pedestal peeling-ballooning (P-B) magnetohydrodynamic (MHD) turbulence broadens the stable scrape-off layer (SOL) by the transp…
View article: Impact of pedestal density gradient and collisionality on ELM dynamics
Impact of pedestal density gradient and collisionality on ELM dynamics Open
BOUT++ turbulence simulations are conducted to capture the underlying physics of small ELM characteristics achieved by increasing separatrix density via controlling strike points from vertical to horizontal divertor plates for three EAST d…
View article: Data-driven model for divertor plasma detachment prediction
Data-driven model for divertor plasma detachment prediction Open
We present a fast and accurate data-driven surrogate model for divertor plasma detachment prediction leveraging the latent feature space concept in machine learning research. Our approach involves constructing and training two neural netwo…
View article: Simulation of plasma transport in MPS-LD linear plasma device by using BOUT++
Simulation of plasma transport in MPS-LD linear plasma device by using BOUT++ Open
A linear plasma device (LPD) module based on the 2D transport module under the BOUT++ framework is developed in this paper to simulate plasma transport in the LPD. The LPD module includes three parts, i.e. magnetic field calculation, simul…
View article: Characteristics of grassy ELMs and their impact on the divertor heat flux width
Characteristics of grassy ELMs and their impact on the divertor heat flux width Open
BOUT++ turbulence simulations are conducted for a 60 s steady-state long pulse high β p EAST grassy ELM discharge. BOUT++ linear simulations show that the unstable mode spectrum covers a range of toroidal mode numbers from low- n ( n = 10–…
View article: Impact of pedestal density gradient and collisionality on ELM dynamics
Impact of pedestal density gradient and collisionality on ELM dynamics Open
BOUT++ turbulence simulations are conducted to capture the underlying physics of the small ELM characteristics achieved by increasing separatrix density via controlling strike points from vertical to horizontal divertor plates for three EA…
View article: Data-driven model for divertor plasma detachment prediction
Data-driven model for divertor plasma detachment prediction Open
We present a fast and accurate data-driven surrogate model for divertor plasma detachment prediction leveraging the latent feature space concept in machine learning research. Our approach involves constructing and training two neural netwo…
View article: Characteristics of grassy ELMs and its impact on the divertor heat flux width
Characteristics of grassy ELMs and its impact on the divertor heat flux width Open
BOUT++ turbulence simulations are conducted for a 60s steady-state long pulse high \{beta}p EAST grassy ELM discharge. BOUT++ linear simulations show that the unstable mode spectrum covers a range of toroidal mode numbers from low-n (n=10~…
View article: Modeling of small tungsten dust grains in EAST tokamak with NDS-BOUT++
Modeling of small tungsten dust grains in EAST tokamak with NDS-BOUT++ Open
To investigate the transport of small dusts as well as their evolution property along their trajectories, the NDS module is developed under the BOUT++ framework, a highly desirable C++ code package to perform parallel plasma fluid simulati…
View article: Effects of radial transport on divertor power and particle flux widths under different operational regimes in EAST
Effects of radial transport on divertor power and particle flux widths under different operational regimes in EAST Open
Here, a study of the effects of radial transport on the outer divertor particle and power flux widths (λjs and λq) is carried out using plasmas under different operational regimes in the Experimental Advanced Superconducting Tokamak (EAST)…
View article: Simulations of divertor heat flux width using transport code with cross-field drifts under the BOUT++ framework
Simulations of divertor heat flux width using transport code with cross-field drifts under the BOUT++ framework Open
The fluid transport code [trans-electric field (Er) module] under the BOUT++ framework has been used to simulatedivertor heat flux width and boundary Er with all drifts and the sheath potential in the scrape-off layer. The calculated stead…
View article: Impact of plasma density/collisionality on divertor heat flux width
Impact of plasma density/collisionality on divertor heat flux width Open
Both ASDEX-Upgrade (AUG) data and the generalized HD (GHD) model showed that the scrape-off width broadens as the density/collisionality increases [1, 2]. A series of BOUT++ transport simulations are performed to study the physics of the s…
View article: Modelling of nanometer scale dust grains in tokamak
Modelling of nanometer scale dust grains in tokamak Open
Dust poses a serious threat to tokamak operation and safety. It is important to study the behaviour of dust grains under tokamak's discharge conditions, which depends heavily on their size and charge. Existing simulations mainly address is…
View article: Simulation of divertor heat flux width on EAST by BOUT++ transport code
Simulation of divertor heat flux width on EAST by BOUT++ transport code Open
The BOUT++ edge plasma transport code is applied to study the effects of neutral recycling, drifts and heating scheme on edge plasma profiles and the divertor heat flux width of two discharges of the experimental advanced superconducting t…
View article: Simulations of divertor heat flux width using transport code with cross-field drifts under the BOUT++ framework
Simulations of divertor heat flux width using transport code with cross-field drifts under the BOUT++ framework Open
The fluid transport code [trans-electric field (Er) module] under the BOUT++ framework has been used to simulate divertor heat flux width and boundary Er with all drifts and the sheath potential in the scrape-off layer. The calculated stea…
View article: Simulations of tokamak boundary plasma turbulence transport in setting the divertor heat flux width
Simulations of tokamak boundary plasma turbulence transport in setting the divertor heat flux width Open
The BOUT++ code has been used to simulate edge plasma electromagnetic (EM) turbulence and transport, and to study the role of EM turbulence in setting the scrape-off layer (SOL) heat flux width λq. More than a dozen tokamak discharges from…
View article: Prediction of divertor heat flux width for ITER using BOUT++ transport and turbulence module
Prediction of divertor heat flux width for ITER using BOUT++ transport and turbulence module Open
Investigation of turbulent transport dynamics in scrape-off-layer (SOL) and divertor heat flux width prediction is performed for ITER. Both BOUT++ transport and BOUT++ turbulence codes are applied to capture the physics on different tempor…