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Controlled application of radiating impurities in the boundary layer can help to solve the problem of power exhaust in a fusion reactor. Injection of neon, a gas recycled at the wall, enabled the establishment of a quasistationary radiating boundary layer, from which more than 90 % of the input power was emitted. The required neon density was established by means of a feedback control. Silicon was introduced as a condensing element, revealing self-controlling mechanisms effective with changing plasma parameters. In neither case was a significant increase in the central impurity concentration observed and good energy confinement time was maintained up to the highest plasma densities. The underlying mechanisms for the buildup of a radiating plasma mantle and the interdependences of neon and silicon on the other impurities are discussed.

Additional information

Authors: POSPIESZCZYK A ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);DURODIE F ET AL., Laboratoire de Physique des Plasmas, Ecole Royale Militaire, Bruxelles (BE)
Bibliographic Reference: Article: Physics of Plasmas, Vol. 2 (1995) No. 6, pp. 2272-2280
Record Number: 199510885 / Last updated on: 1995-08-10
Original language: en
Available languages: en