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Bifurcation and Relaxation Oscillations in Divertor Plasmas
Author(s) -
Bachmann P.,
Sünder D.,
Wenzel U.
Publication year - 1996
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150360408
Subject(s) - divertor , tokamak , plasma , bifurcation , relaxation (psychology) , asdex upgrade , physics , impurity , mechanics , atomic physics , nonlinear system , nuclear physics , quantum mechanics , psychology , social psychology
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.