Abstract

High I p , high n e TFTR discharges exhibit a strong density increase throughout most of the period of 0.5 s neutral beam pulses. This increase is consistent with beam fueling. On the other hand, low I p , low n e discharges show n e saturation shortly after the beam turn-on. The latter phenomenon has been observed in smaller devices operated at lower I p (“density-clamping”). The H α emission near the limiter shows a strong density and plasma current scaling [ ( n e/I p) 3 ] but shows little change with beam power toroidal field, and plasma species, or with a change in wall condition (with and without Cr gettering and ZrAl gettering).

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