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| P05 · Computational Analysis of Neutral Particle Fluxes from Non-Axisymmetric Magnetically Confined Plasmas E.A. Veshchev1, P.R. Goncharov2, T. Ozaki2, S. Sudo2, J.F. Lyon3 1Graduate University for Advanced Studies, Hayama, Kanagawa, 240-0193, Japan
Abstract: Energy and angle-resolved measurements of neutral particle fluxes from the plasma provide information about Ti. as well as non-maxwellian anisotropic ion distribution tails from NBI and ICH. Multidirectional diagnostics employing high resolution atomic energy spectrometers are being used to study the ion component heating mechanisms and fast ion confinement in helical plasmas. Since the natural atomic flux source is not localized in contrast to the diagnostic neutral beam or pellet charge exchange methods, the correct interpretation of such measurements in a complex toroidally asymmetric geometry requires a careful numerical modeling of the neutral flux formation and the knowledge of the charge exchange target distributions, relevant cross-sections and the magnetic surface structure. The measured neutral flux calculation scheme for LHD geometry is given. Calculation results for Maxwellian and NBI-induced ion distributions are shown. The behaviour of calculated and experimental suprathermal NBI tails is discussed along with the magnetic axis shift effect on energetic particle confinement.
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