Some parametric decay instabilities of fast magnetosonic waves in the ion cyclotron harmonic frequency regime

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860407· OSTI ID:5504342

Sharma, R P; Kumar, A; Hadi Al Janabi, A; Kumar, R ^[1]

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1. Centre of Energy Studies, Indian Institute of Technology, New Delhi 110016 (India)

In the present paper, some possible parametric decay instabilities of fast magnetosonic waves (FMSW) near the second harmonic of ion cyclotron frequency have been considered in one-ion species hydrogen plasmas. The decay channels of FMSW include an ion Bernstein wave as a high-frequency decay wave and a low-frequency decay wave either as an ion-acoustic wave or kinetic Alfven wave. Applications have been pointed out to the ASDEX (Plasma Phys. Controlled Fusion {bold 28}, 235 (1986)) and ACT-1 (Rev. Sci. Instrum. {bold 53}, 4 (1982)) toroidal devices where parametric decay instabilities of FMSW near the second harmonic of ion cyclotron frequency have been observed in the scrape-off layer and near the edge plasma. It has been shown that the growth rate is sufficiently high at the edge and may thus contribute to the energy deposition to the edge plasma. A comparison between various decay processes has been discussed for different toroidal devices. Applications have also been pointed out to Earth's magnetospheric plasmas where some magnetic fluctuations have been observed.

• OSTI ID: 5504342
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:1; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310* -- Plasma Confinement-- (1992-)
ALFVEN WAVES
ANNULAR SPACE
BERNSTEIN MODE
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
CYCLOTRON FREQUENCY
GEOMAGNETIC FIELD
HARMONICS
HEATING
HYDROMAGNETIC WAVES
INSTABILITY
ION ACOUSTIC WAVES
ION WAVES
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
OSCILLATION MODES
OSCILLATIONS
PARAMETRIC INSTABILITIES
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
SPACE
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION