This paper presents a contribution to bifurcation phenomena in scrape‐off layer modelling. The bifurcations are caused by the non‐monotonic temperature behaviour of the radiation characteristics of plasma impurities. Low‐frequency relaxation oscillations observed in divertor plasmas of the ASDEX Upgrade tokamak are analyzed and computed using a simple model for the dynamics of the impurity density and the electron temperature. The corresponding model equations are a special case of a general system of transport equations whose stability is analyzed. Bifurcations are calculated by solving autonomous and parametrically driven model equations.
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Bachmann et al. (1996) studied this question.
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