Current status of He-cooled divertor development for DEMO |
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Authors: | P. Norajitra R. Giniyatulin T. Hirai W. Krauss V. Kuznetsov I. Mazul I. Ovchinnikov J. Reiser G. Ritz H.-J. Ritzhaupt-Kleissl V. Widak |
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Affiliation: | aForschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany;bD.V. Efremov Institute, Scientific Technical Centre “Sintez”, St. Petersburg, Russia;cIEF2 Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany |
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Abstract: | A He-cooled divertor concept for DEMO is being investigated at the Forschungszentrum Karlsruhe within the framework of the EU power plant conceptual study. The design goal is to resist a heat flux of 10 MW/m2 at least. The major R&D areas are design, analyses, fabrication technology, and experimental design verification. A modular design is preferred for thermal stress reduction. The HEMJ (He-cooled modular divertor with multiple-jet cooling) was chosen as reference concept. It employs small tiles made of tungsten, which are brazed to a thimble made of tungsten alloy W-1%La2O3. The W finger units are connected to the main structure of ODS Eurofer steel by means of a copper casting with mechanical interlock. The divertor modules are cooled by helium jets (10 MPa, 600 °C) impinging onto the heated inner surface of the thimble.In cooperation with the Efremov Institute a combined helium loop & electron beam facility (60 kW, 27 keV) was built in St. Petersburg, Russia, for experimental verification of the design. It enables mock-up testing at a nominal helium inlet temperature of 600 °C, an internal pressure of 10 MPa, and a pressure difference in the mock-up of up to 0.5 MPa. Technological studies were performed on manufacturing of the W finger mock-ups. Several high heat flux tests were successfully performed till now. Post-examination and characterisation of the mock-ups subjected to the high heat flux tests were performed in collaboration with Forschungszentrum Jülich. Altogether, the test results confirm the divertor performance required. The helium-cooled divertor concept was demonstrated to be feasible. The knowledge gained from these experiments and some aspects on the design improvement are discussed in this contribution. |
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Keywords: | Helium-cooled divertor HEMJ concept Impingement cooling High heat flux |
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