Impact of beam ions on α-particle measurements by collective Thomson scattering in ITER

J. Egedal, H. Bindslev, R.V. Budny, P. Woskov

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Collective Thomson scattering (CTS) has been proposed as a viable diagnostic for characterizing fusion born a-distributions in ITER. However, the velocities of the planned 1 MeV deuterium heating beam ions in 1TER are similar to that of fusion born a-particles and may therefore mask the measurements of the fusion products. We apply a new technique for calculating the orbit averaged source, (S), of beam ions for various ITER scenarios. With the known (S) Fokker-Planck modelling is applied to characterize the beam ions during the slowing down process. Theoretical CTS signals for both beam ions and the alpha-particles are calculated. Our investigations show that the CTS measurements of alpha-particles will not be masked by the presence of the beam ions in H-mode plasmas. In lower density reversed shear plasmas, only a part of the CTS alpha-particle spectrum will be perturbed.
    Original languageEnglish
    JournalNuclear Fusion
    Volume45
    Issue number3
    Pages (from-to)191-200
    ISSN0029-5515
    DOIs
    Publication statusPublished - 2005

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