Antenna design for fast ion collective Thomson scattering diagnostic for the international thermonuclear experimental reactor

Frank Leipold, Vedran Furtula, Mirko Salewski, Henrik Bindslev, Søren Bang Korsholm, Fernando Meo, Poul Michelsen, Dmitry Moseev, Stefan Kragh Nielsen, Morten Stejner Pedersen

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    Fast ion physics will play an important role for the international thermonuclear experimental reactor (ITER), where confined alpha particles will affect and be affected by plasma dynamics and thereby have impacts on the overall confinement. A fast ion collective Thomson scattering (CTS) diagnostic using gyrotrons operated at 60 GHz will meet the requirements for spatially and temporally resolved measurements of the velocity distributions of confined fast alphas in ITER by evaluating the scattered radiation (CTS signal). While a receiver antenna on the low field side of the tokamak, resolving near perpendicular (to the magnetic field) velocity components, has been enabled, an additional antenna on the high field side (HFS) would enable measurements of near parallel (to the magnetic field) velocity components. A compact design solution for the proposed mirror system on the HFS is presented. The HFS CTS antenna is located behind the blankets and views the plasma through the gap between two blanket modules. The viewing gap has been modified to dimensions 30 × 500 mm2 to optimize the CTS signal. A 1:1 mock-up of the HFS mirror system was built. Measurements of the beam characteristics for millimeter-waves at 60 GHz used in the mock-up agree well with the modeling.
    Original languageEnglish
    JournalReview of Scientific Instruments
    Issue number9
    Pages (from-to)093501
    Publication statusPublished - 2009

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    Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


    • Fusion energy

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