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Analysis based on the particle conservation law has been carried out to observe the global fuelling process in tokamak discharges. The response of the net recycling flux from the first wall is investigated in the tokamak TEXTOR, using calibrated signals of the gas feed rate, the neutral gas pressure in the vessel, the total amount of electrons, and the particle removal rates by the ALT-II belt-pump limiter and by a main pump unit. Net absorption of hydrogen by the wall is observed for almost all tokamak discharges since a new wall conditioning technique called siliconisation is employed. The net absorption or fuelling depending on the discharge condition and influenced by injection of pellets, by helium gas injection combined with neutral beam injection, and by rf heating, can be interpreted in terms of the particle-induced desorption effect with depth profile taken into consideration.

Additional information

Authors: BANNO T, University of Tokyo (JP);NODA N, NIFS, Nagoya (JP);GRAY D, UCLA, Los Angeles (US);FINKEN K H ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 220-222 (1995) pp. 478-482
Record Number: 199510761 / Last updated on: 1995-07-12
Original language: en
Available languages: en