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The concept of the cold radiation boundary could be a possible solution for the problem of power exhaust in a fusion reactor. Experiments with neon injection into auxiliary heated hydrogenic discharges on TEXTOR have shown the following properties: (i) strong enhancement of the radiated power up to a value of the ratio gamma of the radiated power to the input power of the order of 0.9; (ii) the emitting volume is localised in the plasma periphery; (iii) the edge temperature is reduced while the central one stays constant or slightly increases for a given electron density; (iv) the confinement properties are at least maintained; (v) the incremental plasma contamination due to the presence of neon is estimated to be low. This paper deals with an analysis of the mechanisms responsible for the plasma contamination during the injection of neon, and with the comparison of the relation between the increase of radiated power and the increase of the contamination.

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Authors: TELESCA G, Forschungszentrum Jülich GmbH (KFA) (DE);SAMM U, Forschungszentrum Jülich GmbH (KFA) (DE);UNTERBERG B, Forschungszentrum Jülich GmbH (KFA) (DE);KOCH R, Ecole Royale Militaire, Bruxelles (BE);MESSIAEN A E, Ecole Royale Militaire, Bruxelles (BE)
Bibliographic Reference: Article: 21st EPS Conference on Controlled Fusion and Plasma Physics, Montpellier, 27 June - 1 July, 1994, Vol. 18B (1994) Part II, pp. 806-809
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