Global particle recycling with ohmic and neutral beam heating in TFTR

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 h...

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Bibliographic Details
Published in:Journal of nuclear materials 1987-02, Vol.145, p.544-550
Main Authors: Shimada, M., Ramsey, A.T., Owens, D.K., Dylla, H.F., Budny, R.V., Lomarche, P.H., Schivell, J.F., Groebner, R.J., Heifetz, D., Murakami, M.
Format: Article
Language:English
Subjects:
particle balance
particle confinement time
particle recycling
TFTR
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Summary: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).
ISSN:0022-3115
1873-4820
DOI:10.1016/0022-3115(87)90397-7