UKAEA Journals

Showing 1 - 10 of 64 Journals Results
2020
UKAEA-CCFE-PR(20)135

The poloidal harmonics of the toroidal normal modes of an unstable axisymmetric tokamak plasma are employed as basis functions for the minimisation of the 3D energy functional. This approach presents a natural extension of the perturbative method considered in [M.S. Anastopoulos Tzanis et al, Nuclear Fusion 59:126028, 2019]. This variational formul…

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The published version of this paper is currently under embargo and will be available on 21/08/2021
2020
UKAEA-CCFE-PR(20)115

Spectrum unfolding is a key tool used together with diagnostics in the determination of nuclear fields that are associated with a range of nuclear technologies spanning fusion, fission, nuclear medicine and accelerator domains. The underlying process requires a mathematical method for solving the Fredholm integral equation of the first kind. Thi…

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The published version of this paper is currently under embargo and will be available on 19/10/2022
2020
UKAEA-CCFE-PR(20)15

We discuss the development, testing and comparison of a combined framework of methods for per-forming neutron spectrum unfolding, which includes the UF_G and UF_M codes, based on the un-derlying mathematics of the GRAVEL and MAXED methods respectively, along with a custom pa-rameterised code, UF_P. We compared the behaviour of each method using a s…

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2018
UKAEA-CCFE-PR(20)22

A linear perturbation theory is used to model the MHD stability of tokamak equilibria under the application of external 3D magnetic perturbations [C.C. Hegna, Physics of Plasmas 21 :072502, 2014]. The symmetry breaking produces the coupling of toroidal n modes. We use ELITE [H.R. Wilson et al., Physics of Plasmas 9 :1277, 2002] to produ…

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2019
UKAEA-CCFE-PR(20)07

ELM simulations for the MAST-U Super-X tokamak have been obtained, using the JOREK code. The JOREK visco-resistive MHD model has been used to obtain comparisons of divertor configurations. The simulations show a factor 10 decrease in the peak heat flux to the outer target of the Super-X in comparison to a conventional divertor configuration. A roll…

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