Excitation of lower hybrid waves by a spiraling ion beam in a magnetized dusty plasma cylinder
- Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No.-1, Sector-22, Rohini, Delhi-110086 (India)
A spiraling ion beam propagating through a magnetized dusty plasma cylinder drives electrostatic lower hybrid waves to instability via cyclotron interaction. Numerical calculations of the growth rate and unstable mode frequencies have been carried out for the Princeton Q-1 device using the experimental dusty plasma parameters [e.g., Barkan et al., Planet. Space Sci. 43, 905 (1995)]. It is found that as the density ratio {delta}(=n{sub io}/n{sub eo}, where n{sub i0} is the ion plasma density and n{sub e0} is the electron density) of negatively charged dust grains to electrons increases, the unstable mode frequency of the lower hybrid waves increases. In addition, the growth rate of the instability also increases with the density ratio {delta}. In other words, the presence of negatively charged dust grains can further destabilize the lower hybrid wave instability. The growth rate has the largest value for the modes where J{sub l}(p{sub n}r{sub o}) is maximum [here p{sub n}=x{sub n}/r{sub 0}, where p{sub n} is the perpendicular wave number in cm{sup -1}, r{sub 0} is the plasma radius, and x{sub n} are the zeros of the Bessel function J{sub 1}(x)] i.e., whose eigenfunctions peak at the location of the beam. The growth rate scales as one third power of the beam current.
- OSTI ID:
- 21269083
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 9; Other Information: DOI: 10.1063/1.2983139; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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