Aachen PK 2003 – wissenschaftliches Programm
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P: Plasmaphysik
P 8: Magnetic Confinement
P 8.2: Vortrag
Dienstag, 18. März 2003, 15:50–16:10, FO2
Numerical Simulations of Cold Pulse Experiments on RTP — •E. Min1, H.j. de Blank1, G.M.D. Hogeweij1, A. Thyagaraja2, and P.J. Knight2 — 1FOM Institute for Plasma Physics "Rijnhuizen", Trilateral Euregio Cluster, Nieuwegein, The Netherlands — 2Euratom/UKAEA Fusion Association, Culham, United Kingdom
Perturbative experiments on tokamaks often show a ”non-local effect” [1]. On the former tokamak at Rijnhuizen RTP, transient edge cooling (a cold pulse) was induced by tangential pellet injection. In ohmic plasmas as well as plasmas with strong on- or off-axis ECRH, a significant rise in core Te was observed on a faster-than-diffusive timescale [2]. These observations contradict local transport theories based on diffusion; global modifications in the turbulent transport are an important candidate mechanism.
To get more insight in the physics underlying these phenomena and the role played by turbulent transport, simulations using the global, non-linear, two-fluid code CUTIE for meso-scale turbulence [3] have been performed. Simulations with RTP parameters show a non-local rise of central Te in reaction to a transient edge cooling. This contribution will describe the CUTIE code and the simulations in more detail and discuss the infered role of turbulence in the non-local effect.
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G.M.D. Hogeweij et.al., Plasma Phys. Control. Fusion 42
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A. Thyagaraja, Plasma Phys. Control. Fusion 42 (2000) B255