Abstract
With the aid of spectrum analysis techniques it has been possible to decompose Van de Graaff terminal voltage noise into components that can be related to various mechanical properties of the charging belt. The principal mechanism for noise production is found to be loss of contact between charge applicators (screens) and the belt surface due to imperfect compliance of the applicators, resulting in a belt surface charge distribution with wavy edges and gaps. This noise source has been greatly reduced by replacing the standard stainless steel screens with beryllium-copper shim stock. By this means noise at the belt fundamental frequency has been eliminated.
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