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Refuelling by pellet injection provides large penetration depths so that the neutral particles may be deposited in the vicinity of the plasma centre. The ablated neutral gas builds up a highly collisional neutral cloud, the hydrodynamics of which are mainly determined by the energy loss of the incoming plasma electrons and ions due to the molecular reactions in this cloud. This attenuation acts as an energy source for the cloud and, after penetrating through the neutral gas, the remaining power flux hitting the pellet surface provides the neutral particle source by sublimation of solid deuterium. A pellet model is described which provides an insight into the main characteristics of pellet ablation, quantitatively, without the detailed computation of the cloud structure.

Additional information

Authors: NICOLAI A, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. I (1993) pp. 307-310
Record Number: 199311132 / Last updated on: 1994-11-29
Original language: en
Available languages: en