title: Design optimization of RF lines in vacuum environment for the MITICA experiment.
abstract: This contribution regards the Radio Frequency (RF) transmission line of the Megavolt ITER Injector and Concept Advancement (MITICA) experiment. The original design considered copper coaxial lines of 1″ 5/8, but thermal simulations under operating conditions showed maximum temperatures of the lines at regime not compatible with the prescription of the component manufacturer. Hence, an optimization of the design was necessary. Enhancing thermal radiation and increasing the conductor size were considered for design optimization: thermal analyses were carried out to calculate the temperature of MITICA RF lines during operation, as a function of the emissivity value and of other geometrical parameters. Five coating products to increase the conductor surface emissivity were tested, measuring the outgassing behavior of the selected products and the obtained emissivity values.
authors.affiliation: INFN-LNL, v.le dell'Università 2, I-35020 Legnaro, PD, Italy.
authors.forename: Michela
authors.initials: M
authors.lastname: De Muri
authors.affiliation: Consorzio RFX, Corso Stati Uniti, 4, I-35127 Padova, Italy.
authors.forename: Mauro
authors.initials: M
authors.lastname: Pavei
authors.affiliation: Consorzio RFX, Corso Stati Uniti, 4, I-35127 Padova, Italy.
authors.forename: Federico
authors.initials: F
authors.lastname: Rossetto
authors.affiliation: Consorzio RFX, Corso Stati Uniti, 4, I-35127 Padova, Italy.
authors.forename: Diego
authors.initials: D
authors.lastname: Marcuzzi
authors.affiliation: IENI-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Miorin
authors.affiliation: IENI-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy.
authors.forename: Silvia M
authors.initials: SM
authors.lastname: Deambrosis