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In TEXTOR a high Z limiter experiment was carried out. Mo and W were used as a limiter (10 cm long, 6 cm wide and 5 cm high) and inserted up to 3 cm closer to the plasma than to the main limiter, an ALT-II graphite limiter. Both the thermal response of the limiter and the influence on the plasma performance were analysed in detail and compared with those for the fine-grained graphite (EK98) routinely used. Maximum power fluxes of about 20 MW/m2 for 2s could be loaded on the Mo limiter without severe damage, and the maximum surface temperature was about 2600 C. The limiter surface was subjected to local melting; however, the evaporated Mo did not influence the main plasma very much. After the experiment the surface of the Mo limiter was examined. Although the limiter head was not seriously damaged, appreciable recrystallisation and grain growth were observed. No deposition of impurities of B, C, O and Si was observed. The very high temperature of the limiter surface seems to promote the evaporation of deposited impurities.

Additional information

Authors: TANABE T ET AL., Osaka University (JP);PHILIPPS V ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);FUJINE M, Daido Steel Co. Ltd., Nagoya (JP)
Bibliographic Reference: Article: Fusion Engineering and Design, Vol. 28 (1995) pp. 13-21
Record Number: 199510907 / Last updated on: 1995-08-10
Original language: en
Available languages: en