Speaker
Phillip Santos Silva
(Swiss Plasma Center)
Description
The ITER Electron Cyclotron Heating Upper Launcher (ECHUL) will be used to drive current locally inside magnetic islands located at the q=2 (or smaller) rational surfaces in order to stabilize neoclassical tearing modes (NTMs). Each antenna consists of eight beam lines that are designed for the transmission of up to 1.5 MW of mm-wave power at 170 GHz. The First Confinement System (FCS) is formed by the ex-vessel mm-wave waveguide components, for which SIC-1 classification requirements apply.
Each transmission line consists in a Z shaped set of straight corrugated aluminum alloy (EN AW-6061) waveguides connected by miter bends with a nominal inner diameter of 50 mm. In addition to the ohmic losses related to the mm-wave transmission, the waveguides of the FCS shall be capable of resisting the applied external loads and displacements, and also operate under thermal cyclic loading during ITER operation.
The FCS waveguide nominally transmits up to 1.5 MW of CW170 GHz mm-wave power, with at least 90 % of the power in the main HE11 mode. While actual losses will have to be determined experimentally, estimated losses are considered additive and mm-wave power is assumed to be converted into heat by ohmic dissipation in the waveguide, with intensity peaks reaching up to 9000 W/m2. For continuous working operation at nominal transmitted power, temperature control of the waveguide is required via an active cooling system.
Available commercial solutions for the waveguide are incompatible with the FCS, as they will be subject to higher heat fluxes and shall comply with ITER SIC-1 requirements. Therefore a dedicated cooling system must be designed. This study presents the results of the thermal mechanical analyses of three different cooling concepts, and concludes which is the most suitable for the final FCS system design.
Co-authors
Avelino Mas Sanchez
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Bassem Sudki
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Gabriella Saibene
(Fusion for Energy, Josep Pla 2, Torres Diagonal Litoral B3, E-08019 Barcelona, Spain)
Jean-Daniel Landis
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Mario Gagliardi
(Fusion for Energy, Josep Pla 2, Torres Diagonal Litoral B3, E-08019 Barcelona, Spain)
Phillip Santos Silva
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Rene Chavan
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Robert Bertizzolo
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
Timothy Goodman
(Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland)
