29th Symposium on Fusion Technology (SOFT 2016)

P2.009 The DTT device: first wall, vacuum vessel and cryostat structure

6 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 9

Poster A. Experimental Fusion Devices and Supporting Facilities P2 Poster session

Speaker

Giuseppe Di Gironimo (Department of Industrial Engineering)

Description

This paper describes the activity addressed to the conceptual design of the first wall and the main containment structures of DTT device, which will be broadly presented in the invited talk "Design and definition of a Divertor TOKAMAK Test facility". The work moved from the geometrical constraints imposed by the desired plasma shape and the configuration needed for the magnetic coils.  Many other design constraints have been taken into account such as remote maintainability, space reservations for diagnostic and heating equipment, etc. The basic vessel design resulted in an all-welded single-wall toroidal structure made of 18 sectors. Proper supports have been designed for the first-wall, which was conveniently segmented in view of remote maintenance. This provisional model allowed evaluating the electromagnetic loads on the metallic structure of the vacuum vessel resulting from the current quench due to a plasma disruption. After a FEA mechanical assessment, which was conducted according to ASME code, INCONEL 625 stainless steel has been provisionally selected as reference material for vacuum vessel. The design principles of the cryostat were chiefly based on cost minimization and functionality; thus it was conceived as a single-wall cylindrical vessel supported by a steel frame structure. The same structure will hold the vacuum vessel and the magnets.