Francesco Fanale
(Institute for Plasma Science and Technology – National Research Council)
In view of the realization of the Divertor Tokamak Test (DTT) facility, whose main goal is the study of heat exhaust on the divertor in conditions comparable to ITER and DEMO, up to 45 MW of additional heating shall be coupled to the plasma. The Electron Cyclotron (EC) system will provide most of the power, with 32 1-MW/170 GHz gyrotrons grouped in four clusters of eight sources. Each cluster connects to two launching antennae, based on the front-steering concept, housed in the equatorial port for plasma core heating and current drive and in the upper port for the control of instabilities. The modular unit of the antennae is a launcher dedicated to each beam (six in the equatorial antenna and two in the upper antenna) consisting in two mirrors: a fixed focusing one and a plane steerable one to launch the beam in the desired location in the plasma. In this way, all launchers are independent, giving the flexibility to fulfil the several tasks of the EC system. Circular corrugated waveguide sections are inserted between the last mirror of the transmission line (ex-vessel) and the first mirror of the launcher (in-vessel). This work describes the present status of the design of the antennae and the main challenges to be faced due to the harsh environment and high magnetic field in DTT, with an overview of proposed solutions and backup options for: cooling design of the mirrors and related manufacturing technique, choice of the driving system for the actuation of the steerable mirror and selection of materials.
Francesco Fanale
(Institute for Plasma Science and Technology – National Research Council)
Alessandro Bruschi
(Institute for Plasma Science and Technology – National Research Council)
Saul Garavaglia
(Institute for Plasma Science and Technology – National Research Council)
Alessandro Moro
(Institute for Plasma Science and Technology – National Research Council)
Benedetta Baiocchi
(Institute for Plasma Science and Technology – National Research Council)
Massimiliano Bonesso
(National Institute for Nuclear Physics, Padua)
Daniele Busi
(Department of Mechanical Engineering, Politecnico di Milano)
Roman Chomicz
(EniProgetti)
Razvan Dima
(National Institute for Nuclear Physics, Padua)
Pierluigi Fanelli
(Department of Economy, Engineering, Society and Business Organization (DEIM), University of Tuscia)
Lorenzo Figini
(Institute for Plasma Science and Technology – National Research Council)
Eleonora Gajetti
(MAHTEP Group, Department of Energy “Galileo Ferraris”, Politecnico di Torino)
Gustavo Granucci
(Institute for Plasma Science and Technology – National Research Council)
Dennis Indrigo
(EniProgetti)
David Mascali
(National Institute of Nuclear Physics – INFN-LNS, Catania)
Giorgio Mauro
(National Institute for Nuclear Physics, INFN-LNS, Catania)
Alfredo Pagliaro
(Department of Mechanical Engineering, Politecnico di Milano)
Santi Passarello
(National Institute for Nuclear Physics, INFN-LNS, Catania)
Carlo Pastò
(EniProgetti)
Adriano Pepato
(National Institute for Nuclear Physics, Padua)
Paola Platania
(Institute for Plasma Science and Technology – National Research Council)
Franco Raffaele
(EniProgetti)
Pietro Rebesan
(National Institute for Nuclear Physics, Padua)
Alessandra Salvitti
(Department of Economy, Engineering, Society and Business Organization (DEIM), University of Tuscia)
Laura Savoldi
(MAHTEP Group, Department of Energy “Galileo Ferraris”, Politecnico di Torino)
Afra Romano
(ENEA, Fusion and Nuclear Safety Department, C.R. Frascati)
Alessandro Simonetto
(Institute for Plasma Science and Technology – National Research Council)
Giuseppe Torrisi
(National Institute for Nuclear Physics, INFN-LNS, Catania)
Matteo Turcato
(National Institute for Nuclear Physics, Padua)
Espedito Vassallo
(Institute for Plasma Science and Technology – National Research Council)
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