Collector probe measurements of impurity fluxes in TEXTOR with molybdenum and graphite limiters
The influence of the limiter composition in TEXTOR on the impurity production and transport is studied using a collector probe. The evolution of molybdenum and other metallic impurity deposition rates are plotted during four exposures of the probe to the plasma. In the presence of the Mo limiter the molybdenum flux increases from shot to shot. There is an immediate decrease by a factor of about 3 when the graphite limiter is inserted. It is concluded that the carbonisation layer on the Mo limiter is gradually eroded and that molybdenum atoms removed from the limiter are transported by the plasma along the torus, re-deposited on the surrounding surfaces and removed again in subsequent discharges.
Bibliographic Reference: Paper presented: 17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35810 ORA
Record Number: 199011639 / Last updated on: 1994-12-02
Original language: en
Available languages: en