Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Mirko Salewski, Fernando Meo, Morten Stejner Pedersen, O. Asunta, Henrik Bindslev, Vedran Furtula, Søren Bang Korsholm, T. Kurki-Suonio, Frank Leipold, F. Leuterer, Poul Michelsen, Dmitry Moseev, Stefan Kragh Nielsen, J. Stober, G. Tardini, D. Wagner, P. Woskov

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    Collective Thomson scattering (CTS) experiments were carried out at ASDEX Upgrade to measure the one-dimensional velocity distribution functions of fast ion populations. These measurements are compared with simulations using the codes TRANSP/NUBEAM and ASCOT for two different neutral beam injection (NBI) configurations: two NBI sources and only one NBI source. The measured CTS spectra as well as the inferred one-dimensional fast ion velocity distribution functions are clearly asymmetric as a consequence of the anisotropy of the beam ion populations and the selected geometry of the experiment. As expected, the one-beam configuration can clearly be distinguished from the two-beam configuration. The fast ion population is smaller and the asymmetry is less pronounced for the one-beam configuration. Salient features of the numerical simulation results agree with the CTS measurements while quantitative discrepancies in absolute values and gradients are found.
    Original languageEnglish
    JournalNuclear Fusion
    Issue number3
    Pages (from-to)035012
    Publication statusPublished - 2010


    • Fusion energy


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