5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.118 Development of a graded W/CuCrZr divertor for DEMO reactor

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 118
Poster F. Plasma Facing Components P1 Poster session

Speaker

Franklin Gallay (CEA)

Description

The divertor is the key in-vessel plasma-facing component being in charge of power exhaust and removal of impurity particles. The operational reliability of the divertor target relies essentially on the structural integrity of the component, in particular, at material interfaces, where thermal stresses tend to be concentrated and thus cracks are most likely to initiate. In this context, the quality of material joining is of crucial importance and simultaneously a technological challenge. One fabrication option to reduce the thermal stress at the bond interface of a joint component is to insert a functionally graded interlayer (FGI) into the interface. In this paper, recent development of a novel monoblock type target concept is presented where the tungsten armor monoblock is joined to the copper alloy cooling tube via a thin functionally graded W/Cu interlayer. First results of the development activities are reported focusing on the fabrication process, geometry optimization and heat exhaust performance. The FGI was manufactured using plasma vapor deposition (PVD) and the final assembly was made using hot isostatic pressing. Due to the limitation in the deposition rate of PVD process, the FGI thickness was chosen to be 15 µm. The chemical composition, thickness and the adherence strength of the FGI samples were characterized and found to fulfill the material requirements. A couple of test mock-ups were manufactured on the basis of the optimized geometry which was identified by finite element analysis applying selected structural design criteria. The bonding quality of the fabricated joint mock-ups measured by infrared and ultrasonic inspection is also addressed. Finally, the result of high heat flux tests conducted to evaluate the heat exhaust capability of the mock-ups is presented together with the computational prediction.

Co-authors

Eliseo Visca (ENEA, Unità Tecnica Fusione, ,ENEA C. R. Frascati, via E. Fermi 45, Italy) Franklin Gallay (CEA, Saint Paul Lez Durance, France) Jeong-Ha You (Max Planck Institute for Plasma Physics, Boltzmann Str. 2, 85748 Garching, Germany) Marc Missirlian (CEA, Saint Paul Lez Durance, France) Marianne Richou (CEA, Saint Paul Lez Durance, France) Muyuan Li (Max Planck Institute for Plasma Physics, Boltzmann Str. 2, 85748 Garching, Germany) Philippe Magaud (CEA, Saint Paul Lez Durance, France)

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