Abstract
The measurement of the particle flux from a wall is a standard diagnostic method in magnetic fusion devices. A similar procedure can be applied for measuring the plasma flow recombining in front of a wall using Hα. The other Balmer lines are not suited due to the dependence of the atomic physics factor R/YB on the electron density. We apply the method to estimate the recombining plasma flow in the island divertor of the W7-AS stellarator. The maximum plasma flow in the upper divertor is Γrec=3.6×1022m−2s−1. The recombination zone extends over the whole target but is not uniform.
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