The problem of hairline cracks in the first wall of a fusion reactor
The experimental controlled thermonuclear fusion reactor with magnetic confinement of the tokamak type will be characterised by pulsating operation. Thermal fatigue is, therefore, one of the prime concerns in relation to the life expectancy of components facing the plasma, such as the first wall and the divertor. Furthermore, instances of sudden interruptions in the plasma current mean that the thermal and magnetic energy it contains is deposited on these components, thus creating localised microfusions, subsequently resulting in hairline cracks with a depth of ten or so microns. This report illustrates the activities being carried out at the Joint Research Centre in Ispra which aim to examine the possible synergies of thermal fatigue with plasma disruption. The impact of this interaction on the first wall design is also discussed.
Bibliographic Reference: Paper presented: VII Convegno Nazionale Gruppo Italiano Frattura (IGF 7), Firenze (IT), June 13-14, 1991
Availability: Available from (1) as Paper IT 36231 ORA
Record Number: 199110815 / Last updated on: 1994-12-02
Original language: it
Available languages: it