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Sartori, Emanuele (2013) Study, analysis, design and diagnostics of plasma and beam facing components of fusion devices. [Tesi di dottorato]

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Abstract (inglese)

Neutral Beam Injection is the horse-power of present and future fusion devices. Modeling plays a fundamental role in anticipating/predicting the performance of the injector and optimizing its behaviour. Successful design can only be achieved through integrated approach between physics and engineering. In the last three years, my research activity has been carried out at Consorzio RFX, where the ultimate neutral beam test facility is being designed and constructed. This PhD thesis has sought to address issues critical for the design and operation of such injectors. As the dynamics of beam acceleration and transport are dominated by the density of the background gas, I developed a reliable code for simulating its distribution in high vacuum systems. The density topic is strictly connected to the characteristics of the gas cell where the beam is neutralised before reaching the fusion plasma. Consequently I developed the final design of the Neutraliser and performed the thermo-mechanical verifications, a critical task because of the high power load interesting the beam facing component. I considered also other issues related to the study of beam components - e.g. the beam source in its operating thermal conditions. The development and application of methods and models, the experimental validation and benchmarking, are described in the perspective of a practical use in neutral beam engineering.

Abstract (italiano)

Gli iniettori di neutri sono e saranno il principale sistema di riscaldamento nelle macchine da fusione. La modellazione numerica gioca un ruolo fondamentale nel predirne le prestazioni ed ottimizare il suo funzionamento, ed un buon design nella fisica e ingegneria può essere raggiunto solo tramite un apporoccio integrato tra i due. Nei tre anni trascorsi, ho svolto la mia attività di ricerca presso il Consorzio RFX, dovesarà installato e testato il più grande iniettore di neutri al mondo, ed il suo design è in corso. Questa tesi di dottorato ha affrontato aspetti critici per il design e le operazioni di questa tipologia di iniettori. Poiché le dinamiche di accelerazione e trasporto del fascio di particelle sono dominate dalla presenza di gas residuo, ho sviluppato un codice robusto ed affidabile per simulare la sua distribuzione e flusso nei sistemi di alto vuoto; questo argomento è strettamente legato alle caratteristiche ed il design della cella di gas dove il fascio deve venire neutralizzato prima di raggiungere il plasma da fusione, di cui ho sviluppato il final design ed ho eseguito le verifiche termomeccaniche, che presentano tutte le difficoltà di componenti affacciati ad un fascio di particelle ad alta energia. Altri aspetti hanno riguardato lo studio di componenti e diagnostiche del fascio. Vengono trattati lo sviluppo e l’applicazione di metodi e modelli, e la loro eventuale validazione sperimentale; i risultati sono valutati nella prospettiva di un uso pratico nella ingegneria degli iniettori di neutri.

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Tipo di EPrint:Tesi di dottorato
Relatore:Sonato, Piergiorgio
Correlatore:Dal Bello, Samuele - Dalla Palma, Mauro
Dottorato (corsi e scuole):Ciclo 25 > Corsi 25 > Fusion Science and Engineering
Data di deposito della tesi:30 Gennaio 2013
Anno di Pubblicazione:30 Gennaio 2013
Parole chiave (italiano / inglese):nuclear fusion, neutral beam injectors, vacuum systems, molecular flow, gas distribution, thermo-mechanical design, gas neutraliser, plasma beam facing components
Settori scientifico-disciplinari MIUR:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/14 Progettazione meccanica e costruzione di macchine
Area 02 - Scienze fisiche > FIS/01 Fisica sperimentale
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/18 Fisica dei reattori nucleari
Area 02 - Scienze fisiche > FIS/02 Fisica teorica, modelli e metodi matematici
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/09 Sistemi per l'energia e l'ambiente
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Struttura di riferimento:Centri > Centro Interdipartimentale "Centro Ricerche Fusione"
Codice ID:5880
Depositato il:11 Ott 2013 13:02
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