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High Z materials, as possible plasma facing components for a fusion reactor, are being re-evaluated due to their advantages connected to the low sputtering yield and small erosion. FTU has carried out a series of experiments with different medium and high Z limiter materials, Ni, Mo and W, to improve the knowledge of the plasma behaviour in these conditions. The results on plasma operation, core parameters, impurity content and corresponding radiation losses are presented, and compared with those obtained with a low Z dominant impurity (siliconisation). A simple model coupling the SOL and the plasma core is able to reproduce the experimental results, indicating that sputtering and self-sputtering are the main physical mechanisms of impurity production.

Additional information

Authors: ALLADIO F ET AL., ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Paper presented: International Conference on Plasma Physics, Foz do Icuacu (BR), October 31 - November 4, 1994
Availability: Available from (1) as Paper EN 38775 ORA
Record Number: 199510040 / Last updated on: 1995-01-10
Original language: en
Available languages: en
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