Parametric excitation of ion quasi-mode by the pump near the ion cyclotron frequency

Journal Article · Fri Aug 01 04:00:00 EDT 1980 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.863186· OSTI ID:5152113

Ono, M; Porkolab, M; Chang, R P.H.

Parametric excitation of a nonresonant ion quasi-mode in a low density (i.e., ..omega../sub p/iapprox. =..cap omega../sub i/) plasma is observed when the pump frequency is ..omega../sub 0/> or approx. =2..cap omega../sub i/. From the interferometry measurement, the lower sideband is identified to be the cold lower hybrid wave and the low-frequency mode is shown to be a nonresonant ion quasi-mode. The dependence of the excitation process and the threshold upon density has been measured and was found to agree well with theory. The ion heating associated with this decay process is also observed. Such processes may take place near the plasma surface during ion cyclotron range of frequency heating experiments in tokamaks.

• Research Organization: Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08455
• DOE Contract Number: EY-76-C-02-3073
• OSTI ID: 5152113
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 23:8; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
DISPERSION RELATIONS
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
INSTABILITY
INTERFEROMETRY
ION WAVE INSTABILITY
MAGNETIC FIELDS
NONLINEAR PROBLEMS
PARAMETRIC INSTABILITIES
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA MICROINSTABILITIES
PROBES