Speaker
Avelino Mas Sanchez
(Ecole Polytechnique Fédérale de Lausanne)
Description
The Electron Cyclotron Upper Launcher (ECUL) is an eight beamline ITER antenna aimed to drive current locally inside the islands that may form on the q= 3/2 or 2 rational magnetic flux surfaces in order to stabilize neoclassical tearing modes (NTMs). The primary vacuum boundary at the port plug extends into the port cell region through the ex-vessel mm-wave waveguide components, defining the so-called First Confinement System (FCS). Each transmission line considered here, designed for the transmission of 1.5 MW of mm-wave power at 170 GHz, is delimited by the closure plate at the port plug back end and by a diamond window in the port cell. The FCS essentially consists of a Z-shaped set of straight corrugated waveguides connected by miter bends with a nominal inner diameter of 50 mm.
Thermal expansion, seismic events and plasma loads result in displacements of the vacuum vessel, relative to the tokamak building, that are transferred to the FCS at its interfaces with the port plug. The thermal expansion arising from ohmic losses in the transmission line, water cooling and inertial loads contribute additional displacements within the FCS. In absence of suitable inline waveguide bellows, the adaptation to such imposed displacements is provided by bending compliance of the straight waveguide sections. This paper describes work related to the selection of the applicable load combinations for the FCS, as well as the mechanical and seismic analyses carried out to assess the performance of the system against these load combinations. This global analysis provides load/displacements inputs for component design.
This work was supported in part by the Swiss National Science Foundation. This work was carried out within the framework of the ECHUL consortium, partially supported by the F4E grant F4E-GRT-615. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Co-authors
Alessandro Vaccaro
(Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany)
Avelino Mas Sanchez
(Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland)
Bassem Sudki
(Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland)
Gabriella Saibene
(Fusion for Energy, Josep Pla 2, Torres Diagonal Litoral B3, E-08019 Barcelona, Spain)
Gaetano Aiello
(Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany)
Jean-Daniel Landis
(Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland)
Mario Gagliardi
(Fusion for Energy, Josep Pla 2, Torres Diagonal Litoral B3, E-08019 Barcelona, Spain)
Mark Henderson
(ITER Organization, CS 90 046, F-13067 St Paul lez Durance Cedex, France)
Phillip Santos Silva
(Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland)
Rene Chavan
(Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland)
Timothy Goodman
(Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland)
