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UKAEA-STEP-PR(26)062024
The programme to design plasma scenarios for the Spherical Tokamak for Energy Production (STEP), a reactor concept aiming at net electricity production, seeks to exploit the inherent advantages of the spherical tokamak (ST) while making conservative assumptions about plasma performance. This approach is motivated by the large gap between present-da…
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UKAEA-CCFE-PR(26)4732024
Components on the inner wall of fusion reactors are exposed to extremely high heat loads, and significant care must be taken to minimise the damage to these components during operation. UFOs, also known as Transient Impurity Events (TIEs), are small particles of dust within the tokamak vessel which can lead to plasma disruptions. These can cause se…
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UKAEA-CCFE-CP(26)462025
Background: Off-Site Modular Construction (OSMC) can decrease direct costs by 20-80%[1]. Utilizing OSMC presents exponentially more options for plant designers, along with the configurations presented by cogeneration options such as desalination, residential/ industrial heat, cogeneration, hydrogen production. Objective: It has…
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UKAEA-CCFE-PR(26)4802026
We present a numerical framework for the simulation of collisional plasma dynamics, based on a coupling between Direct Simulation Monte Carlo (DSMC) and Particle-in-Cell (PIC) methods for the Vlasov–Maxwell–Landau system. The approach extends previously developed DSMC techniques for the homogeneous Landau equation to the fully inhomogeneous, el…
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UKAEA-CCFE-PR(26)4822023
When designing a fusion plant plant, many first-of-a-kind components are required. This presents a large potential design space across as many dimensions as the component’s parameters. In addition, multiphysics, multiscale, high-fidelity simulations are required to reliably capture a component\\\\\\\\\\\\’s performance under given boundary c…
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UKAEA-CCFE-PR(26)4832026
Predicting three-dimensional thermal loads during tokamak disruptions is essential for ITER yet remains weakly developed. We present a physics-based workflow that couples MHD simulations of vertical displacement events with field line tracing on a realistic 3D first wall model and a transient wall thermal response. The approach is validated agai…
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UKAEA-STEP-CP(26)022025
The nonlinear transition to large heat fluxes in local gyrokinetic simulations of electromagnetic turbulence in STEP (a conceptual spherical tokamak power plant) is investigated. Consistent with results reported elsewhere, the onset of enhanced transport is shown to depend on a critical value of q2βe and appears closely connected to a limit on β…
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UKAEA-CCFE-PR(26)4842026
In this paper we present the FreeGSNKE Pulse Design Tool (FPDT), an open-source, purely Python-based computational framework that enables in silico predictive design and testing of experimental tokamak plasma scenarios and control strategies. The FPDT couples FreeGSNKE’s evolutive equilibrium solver with a new virtual Plasma Control System (PCS),…
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UKAEA-STEP-CP(26)032024
The Spherical Tokamak for Energy Production (STEP) programme aims to deliver a UK prototype fusion energy plant, targeting 2040, and a path to commercial viability of fusion. The STEP Prototype Powerplant (SPP) has the objectives to generate 100 MWe of net electrical power, be tritium self-sufficient, demonstrate high-grade heat, an…
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UKAEA-STEP-PR(26)142026
The STEP Programme began in 2019 with the mission to deliver a UK prototype fusion energy plant, targeting 2040, and a path to commercial viability of fusion. The STEP Prototype Plant (SPP) aims to demonstrate power plant characteristics by producing at least 100MW net electrical output, being fuel self-sufficient, demonstrating high grade heat …
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