Community Research and Development Information Service - CORDIS


The Frascati Tokamak Upgrade (FTU), now operating in the ohmic phase with a localised plasma facing component (poloidal limiter), will be supplied with a toroidal limiter to withstand the large heat flux expected during the 8 MW, 8 GHz LH radio frequency heating experimental phase. The FTU toroidal limiter was installed in the existing vacuum chamber and the solution studied consisted of 12 sectors, each one 380 x 330 mm. To minimise eddy current effects and to limit thermal mismatches in each sector, 12 tiles are fixed on a steel tree supporting structure. Since the mechanical behaviour of the limiter is crucial in assessing its reliability, an extensive three dimensional finite element analysis was performed modelling a quarter of a sector using 20 node brick elements. In particular a non-linear transient thermal analysis was made under a square wave shaped heat flux history. A fully non-linear mechanical analysis was then performed to investigate the deformed configuration of the tile and support component and the stress level in the tiles. Finally, a ratcheting analysis based on a simplified model was carried out, to describe the mechanical behaviour of the selected material under a number of cycles.

Additional information

Authors: PIZZUTO A, ENEA, Centro Ricerche Energia Frascati, Roma (IT);RICCARDI B, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Paper presented: ABAQUS Users' Conference, Aachen (DE), June 23-25, 1993
Availability: Available from (1) as Paper EN 37693 ORA
Record Number: 199311046 / Last updated on: 1994-11-29
Original language: en
Available languages: en