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Misure di magnetizzazione a 4.2 K di fili compositi superconduttori

Questa tesi riguarda la realizzazione di un apparato per la misura della magnetizzazione in fili compositi superconduttori utilizzati per la realizzazione di magneti ad alto campo da inserire in acceleratori di particelle. Sono state inoltre eseguite svariate misure su campioni di materiale prodotto con diverse tecnologie.

Mostra/Nascondi contenuto.
vi FOREWORD In this thesis, the results of a research and development program performed at the Technical Division (TD) of the Fermi National Accelerator Laboratory (FNAL) are presented and discussed. A trong effort to develop new high field superconducting magnets for next generation accelerators is presently going on at FNAL. Within the High Field Magnet Project (HFM), a Short Sample Test Facility (SSTF) has been set up for testing and characterizing superconducting strands to be used for magnet production. The R&D on high critical current density multifilamentary Nb3Sn strands with low magnetization and small effective filament diameters is an important part of this program, which is pursued by FNAL in collaboration with industry, universities, and other National Laboratories. Within this framework, a balanced coil magnetometer for the measurement of the magnetic properties of superconducting strands has been set up at the SSTF as a part of this thesis work. This new apparatus has been accurately calibrated and tested, and has allowed to obtain reliable measurements of the strand properties. Furthermore, significant results have been obtained in characterizing the properties of Nb3Sn multifilamentary strands produced with the Internal Tin, the Modified Jelly Roll, and the Powder in Tube technologies, in investigating the origin of critical current degradation due to cabling, in explor g how heat treatment affects Nb3Sn properties, in studying homogeneity of magnetic properties along a Nb3Sn strand, and finally in demonstrating the independence of the effective filament diameter on magnetic field in Internal Tin Nb3Sn.

Tesi di Laurea

Facoltà: Ingegneria

Autore: Cristian Boffo Contatta »

Composta da 119 pagine.

 

Questa tesi ha raggiunto 1373 click dal 20/03/2004.

 

Consultata integralmente una volta.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.