Abstract
Two tiles of the primary limiter, which are composed of TiC coated Poco graphite, are heavily cracked during neutral beam heating experiment (beam power of 2 MW). These damages are considered to be caused by the thermal stress due to the over-heat load (2.3 kW/cm 2). The major disruption occurs after a rapid increase of the impurity influx following to the tile cracks. A base temperature of the limiter tile is over 300°C at the time of this accident. These kind of accidents are avoidable with a careful monitoring of the limiter temperature.
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