Abstract
The time evolution is described of TFTR neutral beam heated plasmasthat often featured a decreasing energy content called `rollover'. Rolloveraffects the gross plasma parameters such as energy content and fusion powerproduced, as well as the central plasma parameters and the plasma transportcoefficients. Rollover was studied using a database of all the TFTR plasmasproduced over a two year period. The plasma behaviour at the time of peakenergy content was related to the behaviour at a later quasi-equilibrium time.The main conclusion is that limiter power handling issues were the underlyingcause of TFTR rollover. This study re-emphasizes the fact that power handlingis an important issue for plasma facing components in tokamaks.
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