ANALYTICAL STUDY OF ELECTROMAGNETIC FORCES INDUCED BY EDDY-CURRENT INITER DIVERTOR

ARAKI M SATO K SUZUKI S AKIBA M

M. Araki et al., ANALYTICAL STUDY OF ELECTROMAGNETIC FORCES INDUCED BY EDDY-CURRENT INITER DIVERTOR, Fusion technology, 30(3), 1996, pp. 674-679

10

INGLESE

Article

Nuclear Sciences & Tecnology

Fusion technology → ACNP

0748-1896

30

3

1996

2A

674 - 679

ISI

0748-1896(1996)30:3<674:ASOEFI>2.0.ZU;2-F

It is a key issue to design robust divertor modules for the Internatio nal Thermonuclear Experimental Reactor (ITER). The divertor module, wh ich consists of a cassette body with high heat flux components, has to be designed to handle not only severe particle fluxes and thermal loa ds from the main plasmas, but also various electromagnetic forces duri ng the operations. In particular, the electromagnetic force induced by eddy currents during plasma disruptions is the most severe condition from engineering design point of view. Based on the ITER disruption sc enarios, dynamic electromagnetic forces of the divertor module induced by the eddy currents have been analyzed. To simplify modeling, the ac tively cooled structure made of copper alloys was considered because o f its much lower electrical resistivity compared to the other material s. In the analyses, parametric studies related to electrical connectio ns, divertor cassette configurations and disruption scenarios, have be en considered. Based on the electromagnetic force analyses, elastic st ress analysis has also been performed. In particular at the vertical d isplacement event, analytical results show that the maximum force over 5 MN/m(2) which corresponds to the elastic stress of as high as sever al hundreds MPa is expected in the divertor high heat flux components and that some design modifications for the mitigation of the electroma gnetic force will be necessary.