Abstract
A beryllium limiter was installed in the Impurity Study Experiment-B (ISX-B) tokamak to test the applicability of beryllium as a plasma-side component for possible use in the Joint European Torus (JET). This test was a collaborative effort involving both ORNL and JET personnel. The ISX-B tokamak was operated for more than 3000 high power neutral beam injected discharges using the beryllium limiter as the main confining aperture. In order to access the migration of beryllium in the tokamak and attached diagnostics, both stainless steel and silicon samples were placed at various strategic positions and used as catcher plates. Nuclear reaction analysis was used to measure the beryllium deposited on the plates and provided a measure of the beryllium migration. Both particulates and a thin film were found. The toroidal distribution of these two migration components is presented as well as a discussion of the analysis technique for the deposited beryllium. Analysis was made of the distribution of beryllium particulate matter deposited on the inside of the vessel wall. Both a size distribution and spatial distribution are presented.
Published Version
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