Plasma wave propagation with a plasma density gradient

Abstract

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.

Measurement of Reactive Hydroxyl Radical Species Inside the Biosolutions During Non-thermal Atmospheric Pressure Plasma Jet Bombardment onto the Solution

“…It is found that electron temperature kTe has been increased up to about 1 eV as the argon gas flow rate is increased to 300 sccm, and it is slowly decreased beyond 300 sccm and reached to 0.9 eV at 350 sccm. It is noted that the propagating speed, v p , of plasma jet is given by v p = v 2 /u n [14] based on the diffusion wave-packet model, where v is the ion sound or Bohm's velocity and u n is density gradient gas speed.…”

Determination of electron-plasma temperature by measuring the propagation velocity of plasma-diffusion waves with the mixture gases of Ar-N<inf>2</inf> in the atmospheric pressure plasma jets

“…The bullet propagation has been analyzed by the plasma diffusion waves propagating with the group velocity of wave-packet as u g ~ c s 2 /u n where c s is the velocity of acoustic wave and u n is the velocity of plasma diffusion [1]. The plasma-jet device is made by the syringe-needle electrode combined with the glass tube as it was introduced in Ref.…”