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Impurity transport in the boundary layer of tokamaks may be crucially important in determining the impurity concentrations in the plasma core. Impurity atoms or molecules released from a surface enter the plasma, are rapidly ionised and heated and at the same time undergo transport along and across the magnetic field. Because of the localisation of sources and sinks the problem is inherently 3-dimensional. A number of initial experimental investigations addressing boundary layer impurity transport have been reported and a 2-D/3-D Monte Carlo code has been developed. In the present study, a system of gas-puffing through a Test Limiter is used to introduce impurities into the plasma boundary of TEXTOR. Detailed spectroscopic measurements have been made to characterise the impurity behaviour.

Additional information

Authors: FIELDING S J, Culham Laboratory, UKAEA, Abingdon (GB);MCCRACKEN G, Culham Laboratory, UKAEA, Abingdon (GB);PITTS R A, Culham Laboratory, UKAEA, Abingdon (GB);RUSBÜLDT D, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);SAMM U, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);STANGEBY P C, JET Joint Undertaking, Abingdon, Oxon. (GB);RUSBULDT D, Institut fur Plasmaphysik, Kernforschungsanlage Julich GmbH, Julich (DE)
Bibliographic Reference: Paper presented: 17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35811 ORA
Record Number: 199011640 / Last updated on: 1994-12-02
Original language: en
Available languages: en