Excitation of surface plasma waves by a density modulated electron beam at a conductor-dusty plasma interface

Journal Article · Sun May 15 04:00:00 EDT 2011 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3591345· OSTI ID:21537843

Gupta, Ruby ^[1]; Sharma, Suresh C ^[2]; Prakash, Ved ^[3]

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1. Department of Physics, Swami Shraddhanand College, University of Delhi, Alipur, Delhi-110036 (India)
2. Department of Physics, Maharaja Agrasen Institute of Technology, Rohini, Delhi-110086 (India)
3. India Meteorological Department, Ministry of Earth Science, Lodi Road, New Delhi-110003 (India)

A density modulated electron beam propagating through a conductor-dusty plasma interface drives electromagnetic surface plasma waves (SPWs) to instability via Cerenkov and cyclotron interaction. The SPWs propagate across an external magnetic field parallel to the interface. Numerical calculations of the growth rate and unstable mode frequencies have been carried out for the typical parameters of the SPWs. The frequency and the growth rate of the unstable wave instability increase with the relative density of negatively charged dust grains {delta} (= n{sub io}/n{sub eo}, where n{sub io} is the ion plasma density and n{sub eo} is the electron plasma density). The phase velocity of the unstable waves also increases with {delta}. In addition, the growth rate of the instability increases with the beam density and scales as one-third power of the beam density in Cerenkov interaction and square root of beam density in fast cyclotron interaction. Moreover, the dispersion relation of SPWs has been retrieved in the absence of the modulated beam and without dust grains.

• OSTI ID: 21537843
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 18; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM-PLASMA SYSTEMS
BEAMS
DISPERSION RELATIONS
DUSTS
ELECTRON BEAMS
ENERGY-LEVEL TRANSITIONS
EXCITATION
INSTABILITY
INTERFACES
LEPTON BEAMS
PARTICLE BEAMS
PLASMA
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA SURFACE WAVES
PLASMA WAVES