Abstract
The determination of electron density profiles across the scrape-off layer (SOL) with “neutral beam probes” (Li) in combination with a variable poloidal limiter system shows that the edge densities are not axisymmetric. The profile near the limiter inside the SOL is much steeper than that near the symmetry plane of the flux tube. This result is reproduced by a 2-D MHD model of the SOL where particle sources coming from neutrals, which are released from the limiter, are essential. By using the profile measurements, a particle flux balance can be calculated for radial diffusion, toroidal flow and recycling of neutrals which confirms the picture.
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