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Agostinetti, Piero (2008) Methods for the Thermo-mechanical Analysis and Design of High Power Ion Sources. [Tesi di dottorato]

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Abstract (inglese)

The present doctorate thesis regards the major issues related to the thermo-mechanical analysis and design of high power ion sources. The activities were carried out in the following three areas:
1. Experimental activities on the existing ion sources.
2. Evaluation of the main operating parameters (plasma density, heat loads etc.) of the ITER Neutral Beam Injector (NBI) ion source.
3. Optimization of the thermo-mechanical design of the ITER NBI ion source, considering both the point of views of a good operating behaviour (in terms of ion current density and electrons-to-ions ratio) and a good reliability of the machine (in terms of structural verifications, low deformations and ability to control the operating parameters).
The main original contributions in the three fields have been respectively:
1. A new method for the post-processing of the calorimetric measurement on an ion source, able to precisely evaluate the heating power loads deposed on the various components of the ion source.
2. A new method for the evaluation of the damages given by sputtering inside an ion source.
3. A new Finite Element Method (FEM) technique especially developed for high performance cooling systems, that integrates non-linear CFD, thermal and structural analysis.
Moreover, the following themes, related to the analysis and design of a generic mechanical component, have been investigated and applied to the ion sources:
* The Decision Making methods, with a comparison between the main approaches and an application on the accelerator cooling system design.
* The Computational Fluid Dynamics analyses, with a comparison between the most sophisticated approaches, analytical formulas and experimental data, and an application to the ITER Neutral Beam Injector design.
* The Buckling analyses, with a comparison between different analytical and numerical approaches for the calculation of the buckling modes of a structure subjected to external pressure, and an application to the vacuum vessel of the ELISE facility.
The methods described on this doctorate thesis were developed during the design activities for the ITER Neutral Beam Test Facility at Consorzio RFX (Padova, Italy) and for the ELISE Facility at the Max-Planck-Institut für Plasmaphysik (Garching, Germany), supported by the European Communities under contracts of Association between EURATOM and ENEA, and carried out within the framework of the European Fusion Development Agreement.
Most of these methods can be used also for the analysis and design of a generic high heat flux component. In particular, they are suitable for the analysis and design of many components for the ITER experiment, for the demonstrative reactor DEMO and for the future commercial fusion reactors.


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Tipo di EPrint:Tesi di dottorato
Relatore:Zollino, Giuseppe
Correlatore:Pierluigi, Zaccaria
Dottorato (corsi e scuole):Ciclo 20 > Scuole per il 20simo ciclo > INGEGNERIA INDUSTRIALE > ENERGETICA
Data di deposito della tesi:31 Gennaio 2008
Anno di Pubblicazione:31 Gennaio 2008
Parole chiave (italiano / inglese):Ion Source Thermal mechanical design analysis ITER Neutral Beam Injector
Settori scientifico-disciplinari MIUR:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/19 Impianti nucleari
Struttura di riferimento:Dipartimenti > Dipartimento di Ingegneria Elettrica
Codice ID:224
Depositato il:12 Nov 2008
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