Use of the two-ion hybrid as an impurity diagnostic

Journal Article · Thu May 01 04:00:00 EDT 1986 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865629· OSTI ID:5934174

Chen, F F; Dimonte, G; Christensen, T; Neil, G R; Romesser, T E

In a plasma containing more than one ion species, the frequencies of the ion--ion hybrid resonances can be a sensitive measure of the densities of the minor species, but only if the frequency shifts caused by electron motions are small, as experimental observations suggest. By calculating the eigenfrequencies for ion--ion hybrid waves taking into account collisions, Landau damping, electron inertia, electromagnetic effects, and density gradients, it is found that the frequency shifts are not negligible unless k/sub parallel/ is extremely small. Treatment of the sheath boundary conditions at the ends of a plasma column shows that the effective value of k/sub parallel/ can indeed be sufficiently small, and that the uncorrected resonance frequency is surprisingly accurate over a wide parameter range. Data from an Ar--Xe discharge demonstrate the usefulness of this technique for measuring impurity concentrations.

• Research Organization: Energy Development Group, TRW, Redondo Beach, California 90278
• OSTI ID: 5934174
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 29:5; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BOUNDARY CONDITIONS
COLLISIONAL PLASMA
DAMPING
EIGENVALUES
ELECTROMAGNETISM
ELECTRON DRIFT
HYBRID RESONANCE
IMPURITIES
ION WAVES
LANDAU DAMPING
MAGNETISM
MOMENT OF INERTIA
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA SHEATH
PLASMA WAVES
RESONANCE
SPECTRAL SHIFT