Measurements of the ponderomotive force including sideband mode coupling effects and damping rates

Journal Article · Mon May 01 04:00:00 EDT 1989 · Phys Fluids B; (United States)

DOI:https://doi.org/10.1063/1.859027· OSTI ID:6447407

Meassick, S; Intrator, T; Hershkowitz, N; Browning, J; Majeski, R

Measurements of the interactions of waves in the ion cyclotron range of frequencies (ICRF) with flute interchange modes are presented. Interactions between the applied l = 1 radio frequency (rf) wave and an m = -1 flute mode give rise to sidebands above and below the rf frequency with mode numbers of l = 0 and l = +2, respectively. The contribution of the sideband terms to stability are shown to cancel 40% of the direct ponderomotive contribution. This is less than the 90% predicted by theory (Phys. Fluids 30, 148 (1987)) for an applied l = +1 rf wave above the ion cyclotron frequency with a large separation between the plasma and the vacuum vessel. Measurements of the linear growth and damping rate of the flute instability in the presence of rf are in good agreement with that calculated by considering only the curvature-driven instability and the ponderomotive force. The growth rate of the magnetohydrodynamic mode is consistent with the primary force acting on the plasma being the curvature force. This method allows a determination of the net stabilizing force on the plasma.

• Research Organization: Department of Nuclear Engineering and Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 6447407
• Journal Information: Phys Fluids B; (United States), Journal Name: Phys Fluids B; (United States) Vol. 1:5; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
700107 -- Fusion Energy-- Plasma Research-- Instabilities
ANTENNAS
CORRELATIONS
DAMPING
ELECTRIC FIELDS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLUID MECHANICS
FLUTE INSTABILITY
HEATING
HIGH-FREQUENCY HEATING
HYDRODYNAMICS
ICR HEATING
INSTABILITY
INSTABILITY GROWTH RATES
MAGNETIC MIRRORS
MAGNETOHYDRODYNAMICS
MECHANICS
NONLINEAR PROBLEMS
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
OPEN PLASMA DEVICES
PLASMA
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RF SYSTEMS
SYNTHESIS
TANDEM MIRRORS
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTIONS