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Higher harmonics generation by a spiraling ion beam in collisionless magnetized plasma

Published online by Cambridge University Press:  11 February 2013

JYOTSNA SHARMA
Affiliation:
Physics Group, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi-110066, India
SURESH C. SHARMA
Affiliation:
Department of Applied Physics, Delhi Technological University, Shahbad Daulatpur, Bawana Road, Delhi-110042, India ([email protected])
V. K. JAIN
Affiliation:
Physics Group, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi-110066, India
AJAY GAHLOT
Affiliation:
Department of Physics, Maharaja Surajmal Institute of Technology, C-4, Janakpuri, New Delhi, India

Abstract

A spiraling ion beam propagating through a magnetized plasma cylinder containing K+ light positive ions, electrons, and C7F14 heavy negative ions drives electrostatic ion–cyclotron waves to instability via cyclotron interaction. Higher harmonics of the beam cyclotron frequency can be generated in this way. The unstable mode frequencies and growth rates of both unstable light positive ions and heavy negative ions increase with the relative density of heavy negative ions. Moreover, the growth rate of unstable modes scales as the one-third power of the beam density. The growth rate of unstable modes increases with harmonic number. The frequencies of both unstable modes also increase with magnetic fields. In addition, the real part of both unstable modes (K+ and C7F14) increases with the beam energy and scales as almost one-half power of the beam energy.

Type
Papers
Copyright
Copyright © Cambridge University Press 2013 

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