PANEL DISCUSSION AND CONCLUSIONS ON "TOKAMAK START UP + PROBLEMS AND OPERATIONAL SCENARIOS RELATED TO THE TRANSIENT PHASES OF THERMONUCLEAR FUSION REACTOR"
The following conclusions were reached: Flat Top conditions R Plasma Current likely to be attained. The uncertainties lie in attainment of tau-E, Z-eff, beta-T. At a projected cost of >10 exp (9) ECU these questions must be answered before the next step can be made. Heating Technical progress very good.R Scaling uncertain, e.g. Goldston tau-E alpha p- (21) would be difficult, Goldston must be suppressed, and an H- mode achieved. Ramp-Up Inductive scenario supported by present results looks very efficient and robust. There is an uncertainty as to when divertor configuration can be formed. Non-inductive scenarios (FER), by lower hybrid is proved in principle but may be expensive. The density variation of efficiency is not (fully) understood. There is a need to look at other driving methods (e.g. fast waves) and relate to heating methods. Initiation No apparent difficulties. But keep it clean. Impurities Present results support use of a low Z wall limiter (graphite Be) during initiation and ramp-up. Prediction of heating and burn conditions support use of low sputtering but high Z target in the divertor. In the flat top phase, balance sought between the Scylla of impurity accumulation and the Charybdis of poor confinement time.
Bibliographic Reference: TOKAMAK START UP, 1986, PP. 403-416 PUBLISHED BY PLENUM PUBLISHING CORPORATION, NEW YORK (USA)
Record Number: 1989126024801 / Last updated on: 1989-01-01
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