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

P2.125 Summary of the production of the production of the Wendelstein 7-X divertor target elements

6 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: 125
Poster F. Plasma Facing Components P2 Poster session

Speaker

Jean Boscary (Max-Planck_Institut für Plasmaphysik)

Description

The actively water-cooled target elements of the high heat flux divertor of Wendelstein 7-X (W7-X) are designed to remove a stationary heat flux of 10 MW/m² on its main area and 5 MW/m² at the end adjacent to the pumping gap. A target element is made of a CuCrZr copper alloy heat sink armored with carbon reinforced carbon (CFC) NB31 tiles. The realization of the divertor requires the production of 890 target elements of five different types. In total 19.6 m² of the divertor area is shielded with 16,000 tiles. The industrial production of the target elements by the Austrian company PLANSEE SE needed 5 years. The final successful delivery of the target elements was based on an efficient quality assurance thorough the production by the manufacturer to ensure the stability of the manufacturing process and to react adequately to any quality deviations. The quality of delivered elements was finally assessed by W7-X. The most critical issue was the reliability of the bonding between CFC tiles and heat sink; each tile was inspected by pulsed thermography just after welding onto heat sink and before delivery. The recovery of CuCrZr properties was essential: heat treatment was performed after the electron beam welding of back plate to lid to produce heat sink, of the tiles and water connectors to the heat sink. The hardness and electrical conductivity of the produced elements was measured. Helium tightness of the delivered elements was systematically tested under pressure and at different temperature in a vacuum oven by W7-X. The quality of the delivered elements was confirmed by high heat flux testing based on a statistic approach. The experience gained during the monitoring of the production will be presented and discussed. The next step is 3D-machining of the individual elements to produce the 100 divertor target modules.

Co-authors

Boris Mendelevitch (Max-Planck_Institut für Plasmaphysik, Garching, Germany) Henri Greuner (Max-Planck_Institut für Plasmaphysik, Garching, Germany) Jean Boscary (Max-Planck_Institut für Plasmaphysik, Garching, Germany) Patrick Junghanns (Max-Planck_Institut für Plasmaphysik, Garching, Germany) Reinhold Stadler (Max-Planck_Institut für Plasmaphysik, Garching, Germany) Thomas Friedrich (PLANSEE SE, 6600 Reutte, Austria) Werner Schulmeyer (PLANSEE SE, 6600 Reutte, Austria)

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