Design optimization of RF lines in vacuum environment for the MITICA experiment

Michela De Muri; Mauro Pavei; Federico Rossetto; Diego Marcuzzi; Enrico Miorin; Silvia M Deambrosis

doi:10.1063/1.4933017

Design optimization of RF lines in vacuum environment for the MITICA experiment

Rev Sci Instrum. 2016 Feb;87(2):02B314. doi: 10.1063/1.4933017.

Authors

Michela De Muri¹, Mauro Pavei², Federico Rossetto², Diego Marcuzzi², Enrico Miorin³, Silvia M Deambrosis³

Affiliations

¹ INFN-LNL, v.le dell'Università 2, I-35020 Legnaro, PD, Italy.
² Consorzio RFX, Corso Stati Uniti, 4, I-35127 Padova, Italy.
³ IENI-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy.

PMID: 26932042
DOI: 10.1063/1.4933017

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.