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The edge plasma in tokamaks (within the last closed magnetic surface touching the limiter) is studied theoretically under conditions when the radiation from light impurities makes a strong contribution to its thermal balance. Simple approximative formulae are proposed for the dependence of cooling rates of impurity ions on the electron temperature. A theory is developed for the so-called radiative potential, which is the energy loss by electrons on the ionisation and excitation of an impurity particle entering the discharge. The conditions of the onset of the states with detached plasma are explained for discharges with ohmic heating. The discharges with auxiliary heating and neon puffing are studied. Theoretical predictions are compared in detail with the experimental data from TEXTOR.

Additional information

Authors: TOKAR M Z, Academy of Sciences, Moscow (SU)
Bibliographic Reference: Report: Jül-2588 EN (1992) 44 pp.
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
Record Number: 199211268 / Last updated on: 1994-11-29
Original language: en
Available languages: en