M. Wigram
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View article: SOLPS-ITER numerical simulations of ITER-scale Snowflake divertors: low-field-side SF−/SF+ and high-field-side SF−/SF+ configurations
SOLPS-ITER numerical simulations of ITER-scale Snowflake divertors: low-field-side SF−/SF+ and high-field-side SF−/SF+ configurations Open
Using the edge plasma code package SOLPS-ITER, we study the four types of Snowflake (SF) divertors for an ITER-size tokamak, with toroidal magnetic field B T ∼ 5 T, major radius R ∼ 5 m and plasma current I p ∼ 10 MA. Our aim is to provide…
View article: Determination of confinement regime boundaries via separatrix parameters on Alcator C-Mod based on a model for interchange-drift-Alfvén turbulence
Determination of confinement regime boundaries via separatrix parameters on Alcator C-Mod based on a model for interchange-drift-Alfvén turbulence Open
The separatrix operational space (SepOS) model (Eich and Manz 2021 Nucl. Fusion 61 086017) is shown to predict the L–H transition, the L-mode density limit, and the ideal magnetohydrodynamic ballooning limit in terms of separatrix paramete…
View article: The separatrix operational space of next-step fusion experiments: From ASDEX Upgrade data to SPARC scenarios
The separatrix operational space of next-step fusion experiments: From ASDEX Upgrade data to SPARC scenarios Open
Fusion power plants require ELM-free, detached operation to prevent divertor damage and erosion. The separatrix operational space (SepOS) is proposed as a tool for identifying access to the type-I ELM-free quasi-continuous exhaust regime. …
View article: Enhanced pedestal transport driven by edge collisionality on Alcator C-Mod and its role in regulating H-mode pedestal gradients
Enhanced pedestal transport driven by edge collisionality on Alcator C-Mod and its role in regulating H-mode pedestal gradients Open
Experimental measurements of plasma and neutral profiles across the pedestal are used in conjunction with 2D edge modeling to examine pedestal stiffness in Alcator C-Mod H-mode plasmas. Enhanced D α experiments on Alcator C-Mod observed pe…
View article: Cross-code comparison of the edge codes SOLPS-ITER, SOLEDGE2D and UEDGE in modelling a high-power neon-seeded scenario in the DTT
Cross-code comparison of the edge codes SOLPS-ITER, SOLEDGE2D and UEDGE in modelling a high-power neon-seeded scenario in the DTT Open
In this work, we cross-compare the state-of-the-art edge plasma codes SOLPS-ITER, SOLEDGE2D, and UEDGE in a reactor-relevant neon-seeded Divertor Tokamak Test scenario at nominal power, extending the simplified test-bed of Moscheni et al (…
View article: Power handling in a highly-radiative negative triangularity pilot plant
Power handling in a highly-radiative negative triangularity pilot plant Open
This work explores detailed power handling solutions for a class of high-field, highly-radiative negative triangularity (NT) reactors based around the MANTA concept (Rutherford et al 2024 Plasma Phys. Control. Fusion ). The divertor design…
View article: MANTA: a negative-triangularity NASEM-compliant fusion pilot plant
MANTA: a negative-triangularity NASEM-compliant fusion pilot plant Open
The MANTA (Modular Adjustable Negative Triangularity ARC-class) design study investigated how negative-triangularity (NT) may be leveraged in a compact, fusion pilot plant (FPP) to take a ‘power-handling first’ approach. The result is a pu…
View article: Power handling in a highly-radiative negative triangularity pilot plant
Power handling in a highly-radiative negative triangularity pilot plant Open
This work explores power handling solutions for high-field, highly-radiative negative triangularity (NT) reactors based around the MANTA concept \cite{rutherford_manta_2024}. The divertor design is kept as simple as possible, opting for a …
View article: Particle control via cryopumping and its impact on the edge plasma profiles of Alcator C-Mod
Particle control via cryopumping and its impact on the edge plasma profiles of Alcator C-Mod Open
At the high $n_{e}$ proposed for high-field fusion reactors, it is uncertain whether ionization, as opposed to plasma transport, will be most influential in determining $n_{e}$ at the pedestal and separatrix. A database of Alcator C-Mod di…
View article: Scaling laws for electron kinetic effects in tokamak scrape-off layer plasmas
Scaling laws for electron kinetic effects in tokamak scrape-off layer plasmas Open
Tokamak edge (scrape-off layer (SOL)) plasmas can exhibit non-local transport in the direction parallel to the magnetic field due to steep temperature gradients. This effect along with its consequences has been explored at equilibrium for …
View article: Novel SOLPS-ITER simulations of X-point target and snowflake divertors
Novel SOLPS-ITER simulations of X-point target and snowflake divertors Open
The design and understanding of alternative divertor configurations may be crucial for achieving acceptable steady-state heat and particle material loads for magnetic confinement fusion reactors. Multiple X-point alternative divertor geome…
View article: Simulation of the SPARC plasma boundary with the UEDGE code
Simulation of the SPARC plasma boundary with the UEDGE code Open
Here in this work, the UEDGE edge transport code is used to examine conditions in the SPARC divertor and edge plasma for various levels of carbon impurity and power from the core (PSOL). A double-null magnetic configuration is simulated as…
View article: Incorporating nonlocal parallel thermal transport in 1D ITER SOL modelling
Incorporating nonlocal parallel thermal transport in 1D ITER SOL modelling Open
Accurate modelling of the thermal transport in the 'scrape-off-layer' (SOL) is of great importance for assessing the divertor exhaust power handling in future high-power tokamak devices. In conditions of low collisionality and/or steep tem…
View article: Performance assessment of long-legged tightly-baffled divertor geometries in the ARC reactor concept
Performance assessment of long-legged tightly-baffled divertor geometries in the ARC reactor concept Open
Extremely intense power exhaust channels are projected for tokamak-based fusion power reactors; a means to handle them remains to be demonstrated. Advanced divertor configurations have been proposed as potential solutions. Recent modelling…
View article: Study of passively stable, fully detached divertor plasma regimes attained in innovative long-legged divertor configurations
Study of passively stable, fully detached divertor plasma regimes attained in innovative long-legged divertor configurations Open
Numerical modeling of divertor configurations with radially or vertically extended, tightly baffled, outer divertor legs has demonstrated the existence of a passively-stable fully detached divertor regime. Here in the simulations, long-leg…
View article: Performance assessment of long-legged tightly-baffled divertor geometries in the ARC reactor concept
Performance assessment of long-legged tightly-baffled divertor geometries in the ARC reactor concept Open
Extremely intense power exhaust channels are projected for tokamak-based fusion power reactors; a means to handle them remains to be demonstrated. Advanced divertor configurations have been proposed as potential solutions. Recent modelling…
View article: UEDGE modelling of detached divertor operation for long‐leg divertor geometries in ARC
UEDGE modelling of detached divertor operation for long‐leg divertor geometries in ARC Open
Simulations of the ARC scrape‐off layer and divertor configuration are carried out using UEDGE to perform the first power‐handling assessment for the divertor design. A convective–diffusive anomalous transport model is implemented in the c…
View article: Design Studies and Commissioning Plans for PARS Experimental Program
Design Studies and Commissioning Plans for PARS Experimental Program Open
PARS (Plasma Acceleration Research Station) is an electron beam driven plasma wakefield acceleration test stand proposed for VELA/CLARA facility in Daresbury Laboratory. In order to optimise various operational configurations, 2D numerical…
View article: Design Studies and Commissioning Plans for PARS Experimental Program
Design Studies and Commissioning Plans for PARS Experimental Program Open
PARS (Plasma Acceleration Research Station) is an electron beam driven plasma wakefield acceleration test stand proposed for VELA/CLARA facility in Daresbury Laboratory. In order to optimise various operational configurations, 2D numerical…