Speaker
Paulo Quental
(IPFN - Instituto de Plasmas e Fusão Nuclear)
Description
ITER Plasma Position Reflectometry (PPR) system will be used to estimate the distance between the position of the magnetic separatrix and the first-wall at four pre-defined locations also known as gaps 3, 4, 5, and 6, complementing the information provided by magnetic diagnostics. For gaps 4 and 6, the antennas are to be installed in-vessel between two blanket shield modules. The microwave signal is routed to/from the antennas using rectangular oversized waveguides that enter/exit the vacuum vessel (VV) through feed-outs located in upper ports 01 and 14, respectively. Being in-vessel and attached to inner shell of the VV, these components will be subject to high mechanical loads during plasma disruptions. The magnetic field gradients associated with these disruptions induce eddy and halo currents in the surrounding metallic structures that interact with the remaining magnetic field producing forces and torques that may compromise the integrity of the components. Although the antenna assembly is designed in such way that it can be remotely installed/removed, the waveguides are installed in a support structure welded to the inner shell of the VV and no maintenance is foreseen during ITER operation. Therefore, the design of these components requires detailed integrity analysis to assess if the components will be able to remain operational and fulfil their function for the lifetime of ITER. Here, we report on preliminary electromagnetic analysis of the in-vessel components of gap 4 system, including the development of finite element models of the VV and PPR system components. The analysis was performed with ANSYS based on inputs from DINA code obtained from F4E/IO, to assess the electromagnetic loads on these components for different plasma disruption scenarios. The loads obtained through the analysis presented here will be used as input in the global integrity analysis of the in-vessel components of the ITER PPR system.
Co-authors
Hugo Policarpo
(IPFN - Instituto de Plasmas e Fusão Nuclear, IST - Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;IDMEC, LAETA, IST - Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
Paulo Quental
(IPFN - Instituto de Plasmas e Fusão Nuclear, IST - Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
Paulo Varela
(IPFN - Instituto de Plasmas e Fusão Nuclear, IST - Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
Pedro Lagos
(IPFN - Instituto de Plasmas e Fusão Nuclear, IST - Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
Raul Luis
(IPFN - Instituto de Plasmas e Fusão Nuclear, IST - Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)
