Effect of beam premodulation on excitation of surface plasma waves in a magnetized plasma

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3507293· OSTI ID:21531991

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

---

1. Department of Physics, Swami Shraddhanand College, University of Delhi, Alipur, Delhi 110036 (India)
2. Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No.-l, Sector-22, 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 vacuum magnetized plasma interface drives electromagnetic surface plasma waves (SPWs) to instability via Cerenkov and fast cyclotron interaction. 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} of the unstable wave instability increases with the modulation index ({Delta}) and is maximized for {Delta}=1. For {Delta}=0, {gamma} turns out to be {approx}4.32x10{sup 10} rad/s for Cerenkov interaction and {approx}6.81x10{sup 10} 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. In addition, the real frequency of the unstable wave increases with the beam-energy and scales as almost one-half power of the beam-energy.

• OSTI ID: 21531991
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 17; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
BEAMS
CHERENKOV RADIATION
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ENERGY-LEVEL TRANSITIONS
EXCITATION
INSTABILITY
INSTABILITY GROWTH RATES
LEPTON BEAMS
PARTICLE BEAMS
PLASMA
PLASMA INSTABILITY
PLASMA SIMULATION
PLASMA WAVES
RADIATIONS
SIMULATION