D. Borba
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View article: Observation of modes in the sub-cyclotronic range of frequencies in JET
Observation of modes in the sub-cyclotronic range of frequencies in JET Open
The excitation of modes in the JET tokamak in the sub-cyclotronic range of frequencies (frequencies comprised between the Alfvén frequency and the cyclotron frequency) is for the first time reported. The modes were identified as compressio…
View article: Predictive modeling of Alfvén eigenmode stability in inductive scenarios in JT-60SA
Predictive modeling of Alfvén eigenmode stability in inductive scenarios in JT-60SA Open
The JT-60SA device offers unique conditions before ITER for the study of the interaction of energetic particles with plasma waves. With similar dimensions to JET, e.g., a major radius but with a slightly more elongated plasma volume, JT-60…
View article: Stability analysis of alpha driven toroidal Alfvén eigenmodes observed in JET deuterium-tritium internal transport barrier plasmas
Stability analysis of alpha driven toroidal Alfvén eigenmodes observed in JET deuterium-tritium internal transport barrier plasmas Open
A toroidal Alfvén eigenmode (TAE) has been observed to be driven by alpha particles in a JET deuterium-tritium internal transport barrier plasma. The observation occurred 50 ms after the removal of neutral beam heating (NBI). The mode is o…
View article: High-order coupling of shear and sonic continua in JET plasmas
High-order coupling of shear and sonic continua in JET plasmas Open
A recent model coupling the shear-Alfvén and acoustic continua, which depends strongly on the equilibrium shaping and on elongation in particular, is employed to explain the properties of Alfvénic activity observed on JET plasmas below but…
View article: High-order coupling of shear and sonic continua in JET plasmas
High-order coupling of shear and sonic continua in JET plasmas Open
A recent model coupling the shear-Alfvén and acoustic continua, which depends strongly on the equilibrium shaping and on elongation in particular, is employed to explain the properties of Alfvénic activity observed on JET plasmas below but…
View article: Toroidal Alfvén eigenmode stability in JET internal transport barrier afterglow experiments
Toroidal Alfvén eigenmode stability in JET internal transport barrier afterglow experiments Open
In this work, we use reduced and perturbative models to examine the stability of toroidal Alfvén eigenmodes (TAEs) during the internal transport barrier (ITB) afterglow in JET experiments designed for the observation of alpha driven TAEs. …
View article: EUROfusion-theory and advanced simulation coordination (E-TASC): programme and the role of high performance computing
EUROfusion-theory and advanced simulation coordination (E-TASC): programme and the role of high performance computing Open
This paper is a written summary of an overview oral presentation given at the 1st Spanish Fusion High Performance Computer (HPC) Workshop that took place on the 27 November 2020 as an online event. Given that over the next few years ITER 2…
View article: Energetic ion losses ‘channeling’ mechanism and strategy for mitigation
Energetic ion losses ‘channeling’ mechanism and strategy for mitigation Open
Results from two different sets of JET experiments are presented. In experiments in which toroidicity-induced Alfven eigenmodes (TAEs) localized at different radial locations had the same frequencies and toroidal mode numbers, the occurren…
View article: Systematic linear-stability assessment of Alfvén eigenmodes in the presence of fusion α-particles for ITER-like equilibria
Systematic linear-stability assessment of Alfvén eigenmodes in the presence of fusion α-particles for ITER-like equilibria Open
A systematic approach to evaluate the linear stability of Alfvén eigenmodes in the presence of fusion-born -particles is reported. The techniques developed are particularly useful when dealing with scenarios where no experimental guidance …