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Observation of electron plasma waves inside large amplitude electromagnetic pulses in a temporally growing plasma

Pandey, Shail ; Bhattacharjee, Sudeep ; Sahu, Debaprasad

Physics of Plasmas, January 2012, Vol.19(1) [Periódico revisado por pares]

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  • Título:
    Observation of electron plasma waves inside large amplitude electromagnetic pulses in a temporally growing plasma
  • Autor: Pandey, Shail ; Bhattacharjee, Sudeep ; Sahu, Debaprasad
  • Assuntos: Articles
  • É parte de: Physics of Plasmas, January 2012, Vol.19(1)
  • Descrição: Observation of electron plasma waves excited inside high power (∼10 kW) short pulse (∼20 μs) electromagnetic (em) waves interacting with a gaseous medium (argon) in the pressure range 0.2–2.5 mTorr is reported. The waves have long wavelength (∼13 cm) and get damped at time scales slower (∼3 μs) than the plasma period (0.1–0.3 μs), the energy conveyed to the medium lead to intense ionization (ion density n i  ∼ 10 11 cm −3 and electron temperature T e  ∼ 6–8 eV) and rapid growth of the plasma (∼10 5 s −1 ) beyond the waves. Time frequency analysis of the generated oscillations indicate the presence of two principal frequencies centered around 3.8 MHz and 13.0 MHz with a spread Δ f  ∼ 4 MHz, representing primarily two population of electrons in the plasma wave. The experimental results are in reasonable agreement with a model that considers spatiotemporal forces of the em wave on the medium, space charges and diffusion.
  • Idioma: Inglês

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