Ion-temperature-gradient-driven instability and anomalous ion heating in reversed-field pinches

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870509· OSTI ID:6685985

Guo, S C; Paccagnella, R ^[1]; Romanelli, F ^[2]

---

1. Istituto Gas Ionizzati del CNR, EURATOM-ENEA-CNR Association, 35020 Padova (Italy)
2. Associazione EURATOM-ENEA sulla Fusione, C.R.E. Frascati c.p. 65, 00044 Frascati, Roma (Italy)

A possible mechanism is suggested for direct ion heating in reversed-field pinches (RFP). The ion temperature gradient mode induces collisionless ion perpendicular viscosity which damps the velocity fluctuations associated with resistive magnetohydrodynamic (MHD) mode activity. It is found that the growth rate of the [eta][sub [ital i]] instability is much larger than that in a tokamak, because the effects of both bad magnetic curvature and negative compressibility are enhanced in a RFP configuration. The anomalous perpendicular viscosity coefficient is estimated from the mixing length argument and the corresponding ion heating power due to viscous dissipation is found sufficient to balance the ion conductive losses.

• OSTI ID: 6685985
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:8; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
COMPRESSIBILITY
FLUID MECHANICS
HEATING
HYDRODYNAMICS
INSTABILITY GROWTH RATES
ION TEMPERATURE
MAGNETOHYDRODYNAMICS
MECHANICAL PROPERTIES
MECHANICS
PINCH EFFECT
PLASMA DRIFT
PLASMA HEATING
REVERSE-FIELD PINCH
TURBULENCE
VISCOSITY