Principles of fuel ion ratio measurements in fusion plasmas by collective Thomson scattering

Morten Stejner Pedersen, Stefan Kragh Nielsen, Henrik Bindslev, Søren Bang Korsholm, Mirko Salewski

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    Abstract

    For certain scattering geometries collective Thomson scattering (CTS) measurements are sensitive to the composition of magnetically confined fusion plasmas. CTS therefore holds the potential to become a new diagnostic for measurements of the fuel ion ratio—i.e. the tritium to deuterium density ratio. Measurements of the fuel ion ratio will be important for plasma control and machine protection in future experiments with burning fusion plasmas. Here we examine the theoretical basis for fuel ion ratio measurements by CTS. We show that the sensitivity to plasma composition is enhanced by the signatures of ion cyclotron motion and ion Bernstein waves which appear for scattering geometries with resolved wave vectors near perpendicular to the magnetic field. We investigate the origin and properties of these features in CTS spectra and give estimates of their relative importance for fuel ion ratio measurements.
    Original languageEnglish
    JournalPlasma Physics and Controlled Fusion
    Volume53
    Issue number6
    Pages (from-to)065020
    ISSN0741-3335
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Fusion energy

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