Abstract
Surfaces of two sets of limiters were analyzed by PIXE and RBS. One is made of stainless steel SUS 304 and the other made of graphite. The two limiters are the same shape and size and have been exposed to similar numbers of tokamak discharges. Molybdenum and titanium were observed on both limiters. Although the deposited metals were larger on the graphite limiters than the amount on the steel limiters, the plasma radiation intensity from Mo or Ti was smaller with the graphite limiter than with the steel limiter during tokamak discharges. The sputtering rate of the metals on the graphite limiter was investiaged with an argon-ion beam. The apparent sputtering yields of metals are small on carbon limiters, and this results in the lower metal contamination of tokamak plasmas with carbon limiters than with metal limiters.
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