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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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UKAEA-CCFE-PR(26)4282026
This paper presents simulations of alpha-particle transport in ITER driven by static 3D magnetic field perturbations in the high-performance 15 MA Q = 10 baseline scenario, specifically resonant magnetic perturbations (RMPs) arising from edge-localized mode (ELM) control coils, combined with toroidal field ripple (TFR) and effects from ferromagn…
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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-RACE-PR(26)122025
The current strategy for joining ITER diverter cooling pipes is to conduct semi-automated autogenous Tungsten Inert Gas (TIG) welding on thin-walled pipes using an inserted flat washer filler ring. In this approach, the positioning of the filler ring and the alignment the pipe stubs so far can only be achieved manually. However, it has limitatio…
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UKAEA-CCFE-PR(26)4632025
Experiments at the MAST-U tokamak, supported by simulations, investigate the exhaust benefits of the “Super-X Double-Null” magnetic configuration, particularly whether its elongated, strongly wall-baffled divertor legs enable a broader detachment window than conventional, short-legged designs. This study presents SOLPS-ITER simulations of Su…
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UKAEA-RACE-PR(26)082025
In scenarios involving radiation such as decommissioning of nuclear disasters and operating nuclear power plants, it is necessary to perform tasks including maintenance, demolition, and inspection using robots in order to protect human workers from harm. LIDAR (LIght Detection And Ranging) sensors are used for many demanding real-time tasks in robo…
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UKAEA-CCFE-CP(26)372025
Recent results from MAST Upgrade are presented, emphasising understanding the capabilities of this new device and deepening understanding of key physics issues for the operation of ITER and the design of future fusion power plants. The impact of MHD instabilities on fast ion confinement have been studied, including the first observation of fast i…
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UKAEA-CCFE-CP(26)352025
Diagnostics are critical on the path to commercial fusion machines, since the ability to understand and measure plasma features is important to sustaining fusion reactions. Gamma spectroscopy is a technique in experimental nuclear physics that can be used to aid fusion diagnostics, including providing information in neutron activation analyses to c…
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UKAEA-CCFE-PR(26)4152025
An understanding of the occurrence of opacity is important for modelling the power exhaust of magnetic confinement fusion plasmas. The absorption and reemission of radiation alters the magnitude and distribution of radiation within the divertor of the fusion machines, the plasma volume wi…
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UKAEA-STEP-PR(26)012025
We have investigated the response of detached plasmas to multi-ms timescale power transients using 1D simulations of the scrape-off layer on a scale and parameter range relevant for reactor-scale tokamaks, such as the Spherical Tokamak for Energy Production (STEP). Simulations were performed using the fluid code Hermes3, employing the solver CVODE…
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