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The problem of hot plasma interaction with the material walls is one of the burning questions, the solution of which is essential for the creation of a viable thermonuclear reactor. One way to reduce the temperature of the plasma in contact with the wall elements and the heat loads on them is to increase impurity radiation from the discharge. However, the source of radiation should be localised in the peripheral region and impurities should not contribute significantly to the energy balance of the central plasma and hinder its heating up to thermonuclear temperatures. The light impurities satisfy these requirements since they are ionised up to the helium-like states in a relatively thin layer at the discharge edge. The TEXTOR experiments have shown that in discharges with auxiliary heating, more than 95% of the power can be radiated by neon puffing without the onset of Marfe or detachment, and with the source of radiation staying in the vicinity of the last closed magnetic surface (LCMS), touching the limiter. This paper elaborates the proposed model of the edge plasma particle and energy balances for the case of discharges with auxiliary heating and neon puffing, and the results are compared with experimental data from TEXTOR.

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Authors: TOKAR M Z, Forschungszentrum Jülich GmbH (DE);SAMM U, Forschungszentrum Jülich GmbH (DE)
Bibliographic Reference: Article: Proceedings of the 19th Conference on Controlled Fusion and Plasma Physics, Vol. 2 (1992) pp. 759-762
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