Anomalous impurity ion heating from Alfvénic cascade in the reversed field pinch

Tangri, Varun; Terry, P. W.; Fiksel, Gennady
November 2008
Physics of Plasmas;11/1/2008, Vol. 15 Issue 11, p112501
Academic Journal
Anomalous ion and impurity heating in reversed field pinch plasmas is addressed. Previous work [N. Mattor et al., Comments Plasma Phys. Controlled Fusion 15, 65 (1992)], which calculated the heating of bulk ions by gyro and Landau resonances with turbulent fluctuations cascading from unstable tearing modes, is extended to impurity species measured in Madison symmetric torus (MST). The heavier mass of impurities allows gyro-resonant heating at lower frequencies where more energy is present in the fluctuations. A 0D transport model is used to examine heating rates under various time-dependent, experimental heating scenarios, such as a sawtooth crash. Impurity heating rates calculated for impurities found in MST are comparable to observed rates inferred in the impurity temperature rise during sawtooth events.


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