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Inhomogeneities in tokamak peripheral plasmas due to localised recycling of neutrals (plasma fuelling) are considered. It is shown that a dense cloud of cold charged particles arises in the vicinity of such a localised particle source, for example a gas-puffing valve, as the plasma density exceeds a certain critical level. A dependence of the critical density on such parameters as dimensions of the device, heat flux from the discharge core and diffusivity of charged particles at the edge is found. The results of calculation are compared with experimental data.

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Authors: TOKAR M Z, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 35 (1993) pp. 1119-1135
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