Abstract
An alternative to the basic NET first wall (FW). concept is presented. The concept aims at: minimizing the maximum surface temperature of the protection material, the impurity influx from the wall, the intervention frequency for maintenance as well as increasing the operating margins against the heat loads. This will allow to reduce: the required expansion volumes in case of accidental water ingress in the plasma chamber and the tritium inventory present in the protection material. The solution presented is made of removable local limiters (LL) and the proper first wall in between. The main role of the local limiters is to intercept the particle flux during burn (α particle), during start up when they act as plasma limiters and during disruption to stop the run away electrons. The technologies envisaged to make the local limiter are already being developed for the divertor or they could be a limited extrapolation of existing one. The FW will be coated with methods already existing (e.g. plasma spray or physical vapor deposition), but they should be qualified for the operating condition of the first wall and in-situ repair. The coating can be directly applied on the blanket box or on tubes which afterwards are assembled on the blanket box.
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