EU-DEMO divertor: Cassette design and PFCs integration at pre-conceptual stage

• Published in: Fusion engineering and design Vol. 159; p. 111784
• Main Authors: Bonavolontà, Ugo, Bachmann, Christian, Coccorese, Domenico, Di Gironimo, Giuseppe, Imbriani, Vito, Marzullo, Domenico, Mazzone, Giuseppe, Vorpahl, Christian, You, Jeong-Ha
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2020; Elsevier Science Ltd
• Subjects: Configurations; Cooling; Cooling pipes; DEMO; Destructive testing; Divertor cassette; Divertor target; Nondestructive testing; Pipes; Project management; Divertor cassette; Divertor target; DEMO; Cooling pipes
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2020.111784

•The present work deals with a preliminary engineering development of the cassette divertor and PFCs integration for EU-DEMO.•Introduction of Reflector Plates as two main components in PFC system, useful to protect cassette body and diffusers.•Assembly assessment of all components on the DEMO divertor. The pre-conceptual design of the DEMO divertor cassette with a novelty, alternative path of the main cooling pipes inside cassette body is presented in this paper, focusing on cassette design and Plasma Facing Components (PFC) integration. The divertor cassette design is reviewed, considering recent updates in the DEMO configuration model as presented by the Programme Management Unit (PMU) in 2018. The new configuration requires the cooling pipes to be integrated inside the cassette body. The components affected by these changes and the impact on the divertor design are analyzed. The study focuses on a new integration system between cassette and cooling pipes. The paper describes the integration on the new cassette geometry and the divertor sub-systems. The design activities related to this system are discussed in detail in terms of CAD modeling and considerations with respect to manufacturing such as welding technologies and non-destructive testing.