Preliminary analysis of alternative divertors for DEMO

F. Militello (Corresponding Author), Leena Aho-Mantila, R. Ambrosino, T. Body, H. Bufferand, G. Calabro, G. Ciraolo, D. Coster, G. Di Gironimo, P. Fanelli, N. Fedorczak, A. Herrmann, P. Innocente, R. Kembleton, J. Lilburne, T. Lunt, D. Marzullo, S. Merriman, D. Moulton, A. H. NielsenJ. Omotani, G. Ramogida, H. Reimerdes, M. Reinhart, P. Ricci, F. Riva, A. Stegmeir, F. Subba, W. Suttrop, P. Tamain, M. Teschke, A. Thrysoe, W. Treutterer, S. Varoutis, M. Wensing, A. Wilde, M. Wischmeier, L.Y. Xiang

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A physics and engineering analysis of alternative divertor configurations is carried out by examining benefits and problems by comparing the baseline single null solution with a Snowflake, an X- and a Super-X divertor. It is observed that alternative configurations can provide margin and resilience against large power fluctuations, but their engineering has intrinsic difficulties, especially in the balance between structural solidity and accessibility of the components and when the specific poloidal field coil positioning poses further constraints. A hybrid between the X- and Super-X divertor is proposed as a possible solution to the integration challenge.
Original languageEnglish
Article number100908
JournalNuclear Materials and Energy
Publication statusPublished - Mar 2021
MoE publication typeA1 Journal article-refereed


This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2019–2020 under grant agreement No 633053. This work was partially funded by the RCUK Energy Programme [grant number EP/T012250/1 ].


  • Alternative divertor configurations
  • DEMO
  • Divertor design


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