IMPURITY CONTROL AND ITS IMPACT UPON START-UP AND TRANSFORMER RECHARGING IN NET
The present inductive start-up scenarios for NET are, in broad outline, based upon a limiter configuration for the current initiation and ramp-up phases and a divertor configuration for the heating and burn phases. There have been extensive modelling studies of both the boundary plasma conditions and their impact upon impurity control in the burn-phase and these, when coupled to experience in relevant experiments such as JET, facilitate the identification of likely problems during start-up and transformer recharging. Present knowledge indicates that the inductive start-up scenario appears, with certain caveats, to be compatible with the requirements for impurity control. A particularly significant issue is likely to be the benefit of forming the divertor configuration as soon as possible during start-up. In addition, problems can arise if a limiter plate, constructed from low atomic number material, becomes contaminated with tungsten from the divertor target. In contrast, it seems likely that the transformer recharging scenario could present serious problems.
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON OX14 3DB (UK), MENTIONING REPORT CLM-P 760, 1985
Record Number: 1989125075600 / Last updated on: 1987-12-01
Available languages: en