Loads due to stray microwave radiation in ITER

J.W. Oosterbeek, Victor S. Udintsev, Franco Gandini, Matthias Hirsch, Heinrich P. Laqua, N. Maassen, Yunxing Ma, Alexei Polevoi, Antoine Sirinelli, George Vayakis, Mike J. Walsh

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High-power microwaves generated by gyrotrons will be extensively used in ITER for a variety of purposes such as assisting plasma breakdown, plasma heating, current drive, tearing mode suppression and as a probing beam for the Collective Thomson Scattering diagnostic. In a number of these schemes absorption of the microwaves by the plasma will not be full and in some cases there could be no absorption at all. This may result in a directed beam with a high microwave power flux or – depending on location and plasma conditions – an approximately isotropic microwave power field. The contribution of electron cyclotron emission to these power densities is briefly discussed. Exposure to in-vessel components leads to absorption by metals and ceramics. In this paper microwave power densities are estimated and, following a brief review of absorption, thermal loads on in-vessel components are assessed. The paper is concluded by a discussion of the current approach to control such loads.
Original languageEnglish
Pages (from-to)553-556
JournalFusion Engineering and Design
Publication statusPublished - Oct 2015


  • Microwave stray radiation
  • Gyrotron
  • Power density
  • Absorption
  • ECRH
  • ECE loss


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