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• W2912648175 abstract "One of the fundamental components for the full scientific exploitation of future fusion experiments is the Neutral Beam Injectors (NBI). Such devices shall operate in ITER and DEMO experiments at particle energy levels, heating power and steady state working conditions that have never been simultaneously reached before in other experimental facilities.In addition to the challenging technological and manufacturing aspects, NBIs coupled with future fusion reactors should be characterized by much demanding efficiency, availability and reliability factors, composing and additional set of critical issues that claim for an accurate and robust design. The research activity of this PhD thesis focuses on particular components of the negative ion beam source, the accelerating electrostatic grids, which are characterized by high heating power and highly focused power densities, and hence require a continuous active cooling in order guarantee proper heat removal and temperature control. Present research aims to verify the present solution applied inside the NBI accelerator grids realized in PRIMA facility (i.e. MITICA experiment) and to perform further improvements in the heat transfer process with an acceptable pressure drop and reliable manufacturing process. The main advantages rely on the possibility to extend the fatigue life-cycle of different high thermal stress components and to investigate the possibility to employ alternative dielectric fluids instead of water. Such design solutions would in fact allow the exploitation of less performing fluids in terms of cooling capability. This is particularly relevant in view of DEMO and future power plants characterized by higher efficiency and reliability.The research activity is not only limited to numerical analyses but includes the manufacturing of the prototypes of the accelerator grid cooling channels where the novel channel design solutions have been implemented. In order to characterize the experimental thermo-fluid dynamic behaviour of the samples the hydraulic performances and the cooling efficiency in transient operations have been tested in a specific plant for thermo-hydraulic measurements, called Insulation and Cooling Experiment (ICE).In order to support further optimization design activity and the implementation of the cooling solutions inside full-scale models of the electrostatic accelerating grid in future injector beam source the experimental results have been obtained and compared both with Computational Fluid-Dynamic models in order to validate the numerical realized predictions. The thesis is organized in five chapters.The first one is an introduction to nuclear fusion and magnetic confinement. The second chapter gives a description of the NBI devices, both from the conceptual point of view and technology of its components. The third chapter tackles the development of the novel cooling solution designs on a single channel and single beamlet group sub-modelling of the electrostatic grid system. The fourth chapter confronts the numerical obtained results to the experimental ones performed in the specific test-bed facility.In the fifth chapter the different developed designs have been upgraded to the electrostatic grid full scale model and a general scheme for further design improvement is introduced. Final general conclusions are drawn in the last dedicated section of the work.An outline of dealt topics is placed at the beginning of each of the different five chapters." @default.
• W2912648175 created "2019-02-21" @default.
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• W2912648175 date "2018-01-14" @default.
• W2912648175 modified "2023-09-27" @default.
• W2912648175 title "Development, Optimization and Testing of High Performance Cooling Systems for Fusion Devices" @default.
• W2912648175 hasPublicationYear "2018" @default.
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