Plasma wave propagation with a plasma density gradient

Cho, Guangsup; Choi, Eun-Ha; Uhm, Han Sup
March 2011
Physics of Plasmas;Mar2011, Vol. 18 Issue 3, p034504
Academic Journal
Plasma waves with the plasma diffusion velocity un due to a plasma density gradient are described in a positive column plasma. The ion wave is generated by the perturbation of the operating frequency 106 s-1 and it propagates with the group velocity ug∼cs2/un∼(105-106) m/s, where cs is the acoustic velocity in a fine tube fluorescent lamp, while the electron wave cannot be generated with a turbulence of low frequency less than the electron oscillation frequency ωpe. The propagation of the lighting signal observed in long tube fluorescent lamps is well understood with the propagation of ion waves occurring along the plasma density gradient.


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