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

Journal Article · Sat Nov 15 04:00:00 EST 2008 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2998829· OSTI ID:21259662

Tangri, Varun; Terry, P W; Fiksel, Gennady ^[1]

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1. Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas and Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706 (United States)

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.

• OSTI ID: 21259662
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 15; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FLUCTUATIONS
HEATING RATE
IMPURITIES
IONS
PLASMA
PLASMA HEATING
REVERSE-FIELD PINCH
SAWTOOTH OSCILLATIONS
TEARING INSTABILITY