Excitation of surface plasma waves by a density-modulated electron beam in a magnetized plasma cylinder
- Department of Physics, Swami Shraddhanand College, University of Delhi, Alipur, Delhi 110036 (India)
- Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No.-1, Sector-22, Rohini, Delhi 110086 (India)
- India Meteorological Department, Ministry of Earth Science, Lodi Road, New Delhi 110003 (India)
A density-modulated electron beam propagating through a plasma cylinder excites surface plasma waves (SPWs) via Cerenkov and fast cyclotron interaction. A nonlocal theory of this process has been developed. Numerical calculations of the growth rate and unstable mode frequencies have been carried out for the typical parameters of the SPWs. The growth rate {gamma} (in rad/s) of the unstable wave instability increases with the modulation index {Delta} and has the largest value for {Delta}{approx}1 in addition to when the frequency and wave number of the modulation are comparable to that of the unstable wave. For {Delta}=0, {gamma} turns out to be {approx}6.06x10{sup 9} rad/s for Cerenkov interaction and {approx}5.47x10{sup 9} rad/s for fast cyclotron interaction. 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 is proportional to the square root of beam density in fast cyclotron interaction. The real part of the frequency of the unstable wave increases as almost the square root of the beam voltage. The results of the theory are applied to explain some of the experimental observations.
- OSTI ID:
- 21532067
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 17; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of beam premodulation on excitation of surface plasma waves in a magnetized plasma
Excitation of surface plasma waves by a density modulated electron beam at a conductor-dusty plasma interface
Excitation of surface plasma waves by an electron beam in a magnetized dusty plasma
Journal Article
·
Sun Nov 14 23:00:00 EST 2010
· Physics of Plasmas
·
OSTI ID:21531991
Excitation of surface plasma waves by a density modulated electron beam at a conductor-dusty plasma interface
Journal Article
·
Sun May 15 00:00:00 EDT 2011
· Physics of Plasmas
·
OSTI ID:21537843
Excitation of surface plasma waves by an electron beam in a magnetized dusty plasma
Journal Article
·
Tue Sep 15 00:00:00 EDT 2009
· Physics of Plasmas
·
OSTI ID:21282135