Journals

Showing 11 - 20 of 1482 Journals Results
2020
UKAEA-CCFE-PR(20)103

We develop a dynamic model for the evolution of an ensemble of hundreds of interacting irradiation-induced mobile nanoscale defects in a micrometre size sample. The model uses a Langevin defect dynamics approach coupled to a finite element model, treated using the superposition method. The elastic field of each defect is described by its elastic di…

Preprint
2020
UKAEA-CCFE-PR(20)102

Modification of the external tearing index, Δ\’ext , by magnetic feedback is analytically investigated, for the purpose of controlling the resistive plasma resistive wall mode (RP-RWM). The matching method is pursued, by deriving expressions for the close-loop Δ\’ext and by linking it to the counterpart from the inner layer. Various feedback…

Preprint
2020
UKAEA-CCFE-PR(20)101

A method to quantify the energy transfer among turbulent structures using singular value decomposition (SVD) is presented. We apply the method to numerical turbulence data obtained from a global plasma simulation using the Hasegawa-Wakatani fluid model, in which the Kelvin-Helmholtz instability plays a dominant role. Using the SVD method, the e…

Preprint
2020
UKAEA-CCFE-PR(20)99

If correct, the Lengyel Model offers a simple and powerful tool to predict detachment onset in future fusion reactors. We assess its validity against a comprehensive SOLPS-4.3 simulation database of ITER baseline (Q=10) neon-seeded plasmas (Pacher etal 2015 {it J. Nucl. Mater.} {bf 463} 591). In absolute terms, the Lengyel Model is found to overpre…

Preprint
2020
UKAEA-CCFE-PR(20)100

Dedicated experiments to generate high-energy D ions and D-3He fusion-born alpha particles have been performed at the Joint European Torus (JET) with the ITER-like wall (ILW). Deuterium ions from neutral beam injection (NBI) with acceleration voltage of 100 keV were accelerated to higher energies in the core of mixed D-3He pl…

Preprint
2020
UKAEA-CCFE-PR(20)98

A high performing DEMO divertor target mock-up design that uses the thermal break interlayer concept is presented.  The design evolved from a previous design of which six mock-ups were designed, fabricated and subjected to high heat flux testing.  The new design was generated using optimisation techniques; specifically, software was developed to …

Preprint Purchase
2020
UKAEA-CCFE-PR(20)96

The atmosphere in powder-based additive manufacturing influences the level of impurities inside the build volume as well as the phases formed during cooldown. We use a thermodynamic model to investigate trends for steels commonly considered for fusion reactors and power plants, namely 316L, F91, F92 and Eurofer97. The atmospheres considered are vac…

Preprint
2020
UKAEA-CCFE-PR(20)97

Materials data are an essential aspect of any engineering design and simulation effort. Here we describe a method to capture and log materials data in a human- and machine-readable framework, based on the JSON format.

Preprint
2020
UKAEA-CCFE-PR(20)94

Fusion energy is an area of active development and innovation worldwide, with many design concepts exhibiting a range of technical challenges. A significant portion of technical challenges will be unique for a given design concept, however th…

Preprint
2020
UKAEA-CCFE-PR(20)93

Parametric dependencies of the linear stability of toroidal Alfv´en eigenmode (TAE) in the presence of neutral beam injection (NBI) are investigated to understand the beam drive and damping effect of TAEs in JET and KSTAR. It is found that the results depend on the drift orbit width of the beam-ions normalized to the characteristic mode widths. In…

Preprint Purchase
The published version of this paper is currently under embargo and will be available on 28/04/2021