Preliminary analysis of alternative divertors for DEMO

F. Militello*, L. 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. T. 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

*Corresponding author for this work

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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
Number of pages7
Publication statusPublished - 2021


  • Alternative divertor configurations
  • DEMO
  • Divertor design


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