GLOW DISCHARGE FOR THE FTU MACHINE

The possibility of applying H 2 glow discharge cleaning for the conditioning of the FTU vacuum chamber has been analyzed on a 1:1 scale toroidal sector. The optimization of the surface conditioning acquires relevant importance because of the complexity the inner wall geometry. The FTU vacuum chamber is completely covered by thermal shields that originate hidden regions not exposed to the discharge. Thus, the best procedure to clean both the exposed and non exposed surfaces simultaneously is the combined operation of baking plus glow discharge.