Copper Plating of Small Areas in Large Cavities

After completion of the two additional Alvarez cavities for the Unilac heavy-ion accelerator, experience on the electrolytic copper plating of the circumferential welding seams is reported. The same procedure could be used, if a small area of a previously copper-plated cavity surface turns out to be imperfect or an additional flange hole has to be machined into the wall at a later demand.