Disruption Avoidance on TFTR
1996
Disruptions on the Tokamak Fusion Test Reactor (TFTR), especially those occurring at high stored energy, result in lost experimental run time because many discharges are required to regain wall conditions necessary for good plasma performance. A variety of disruption types have been observed on TFTR. These include density-limit disruptions, those caused by a high influx of impurities, those occurring during the current rampdown, those resulting from locked modes, and those occurring at high normalized β (β N = β T αβ T /I p ). A combination of operational experience and limiter development has helped to avoid many potential disruptions. However, the experimental goal of high fusion power production engenders the risk of high-β N disruptions. A system to limit β N by reducing the neutral beam power as a preprogrammed β N limit is reached is now in use to help avoid high-β N disruptions. Operational issues of disruption avoidance, the β N feedback system, the limitations and possible improvements of the system are discussed.
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