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Author Nielsen, S. K. ♦ Bindslev, H. ♦ Porte, L. ♦ Hoekzema, J. A. ♦ Korsholm, S. B. ♦ Meo, F. ♦ Michelsen, P. K. ♦ Michelsen, S. ♦ Røn, J. ♦ Oosterbeek, J. W. ♦ Tsakadze, E. L. ♦ Westerhof, E. ♦ Woskov, P.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Neutral Beam Start-up Dynamic ♦ Collective Thomson Scattering ♦ Fast Ion Dynamic ♦ Fast Ion ♦ Confined Part ♦ Fast Ion Velocity Distribution ♦ Good Agreement ♦ Neutral Beam Turn ♦ Temporal Evolution ♦ Fast Ion Distribution Function ♦ Collective Thomson ♦ Temporal Measurement ♦ Great Importance ♦ Magnetic Con-fined Burning Fusion Plasma ♦ Ion Motion ♦ Future Fusion Experiment ♦ Ct System ♦ Great Interest ♦ Non-thermal Fast Ion ♦ Receiver Beam ♦ Plasma Fluctuation ♦ Non-burning Tokamak ♦ Unwanted Instability ♦ Ghz Gyrotron ♦ Receiver Beam Overlap ♦ Resolved Fluctuation ♦ Numerical Simulation ♦ Fast Alpha Particle ♦ Scatter-ing Volume ♦ Wave Vector ♦ Bulk Plasma
Abstract The understanding of fast ion dynamics is of great importance in optimising magnetic con-fined burning fusion plasmas. Especially, the confined part of the fast alpha particles is of in-terest, since these need to heat the bulk plasma in future fusion experiments such as ITER, but may drive unwanted instabilities that might react back on the fast ions and in the worst case expel them from the plasma [1]. Also in non-burning tokamaks the fast ion dynamics is of great interest, since any non-thermal fast ions may risk driving turbulence and hence reduce the performance of the plasma. Temporal measurements of the fast ion distribution function have previously been measured by collective Thomson scattering on TEXTOR in the phase during ion heating turn off, in good agreement with numerical simulations [2]. In this paper the temporal evolution of the fast ion velocity distribution in the neutral beam turn on phase is presented. The CTS system on TEXTOR (R = 1.75 m, a = 0.45 m) uses a 110 GHz gyrotron operated at 100 kW to scatter off plasma fluctuations induced by the ion motion. A receiver beam collects part of the radiation from where the probe and receiver beam overlaps, referred to as the scatter-ing volume. The wave vector and frequency of the resolved fluctuation is given by (ωδ, kδ) =
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article