Excitation of lower hybrid waves by a gyrating ion beam in a negative ion plasma

Journal Article · Fri Mar 15 00:00:00 EDT 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4798426· OSTI ID:22107731

Sharma, Jyotsna; Jain, V. K. ^[1]; Sharma, Suresh C. ^[2]; Gahlot, Ajay ^[3]

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1. Physics Group, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110 067 (India)
2. Department of Applied Physics, Delhi Technological University, Shahbad Daulatpur, Bawana Road, Delhi 110 042 (India)
3. Department of Physics, Maharaja Surajmal Institute of Technology, Janakpuri, New Delhi (India)

A gyrating ion beam propagating through a magnetized plasma cylinder containing K{sup +} positive ions, electrons, and SF{sub 6}{sup -} negative ions drives electrostatic lower hybrid waves to instability via Cyclotron interaction. Numerical calculations of the unstable mode frequencies and growth rates of both the unstable positive ion and negative ion modes have been carried out for the existing negative ion plasma parameters. It is found that the unstable mode frequencies of both the modes increase, with the relative density of negative ions. In addition, the growth rates of both the unstable modes also increases with relative density of negative ions. Moreover, the growth rates of both the unstable modes scale as the one-third power of the beam density. The frequencies of both the unstable modes also increase with the magnetic fields. The real part of the unstable wave frequency increases as almost the square root of the beam energy.

• OSTI ID: 22107731
• Journal Information: Physics of Plasmas, Vol. 20, Issue 3; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM-PLASMA SYSTEMS
CYCLOTRONS
ELECTRONS
EXCITATION
ION BEAMS
ION DENSITY
KAONS PLUS
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
MAGNETIC FIELDS
NUMERICAL ANALYSIS
PLASMA DENSITY
PLASMA INSTABILITY
POTASSIUM IONS
SULFUR FLUORIDES