Description of plasma bullet in plasma jet in terms of wave-packet of plasma diffusion

G. Cho, E. Choi, H. Uhm
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Abstract

Summary form only given. The propagation of plasma bullet in a plasma jet is described under the base of fluid theory of plasma diffusion and plasma drift as well as the gas flow. The origin of plasma bullet is analyzed to be the electrostatic plasma diffusion wave propagating in the plasma column of plasma jets. The plasma diffusion waves, electron wave as well as ion wave, propagate as the form of wave-packet modulated to the operation frequency of voltage pulse. The waves have the dispersion relation of ω∼(u d +u b +u n )k where the phase velocity is the addition of fluid such as drift velocity u d , gas blowing velocity u b , and plasma diffusion velocity u n . The waves are modulated to be the wave-packet of dω∼u g dk with the group velocity u g ∼c s 2/u n ∼(104–105) m/s where the acoustic velocity is c s ∼103 m/s and the diffusion velocity is u n ∼(10–102) m/s estimated in a plasma jet device. The plasma diffusion wave propagates resistively against the slope of plasma density gradient1.
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从等离子体扩散波包的角度描述等离子体射流中的等离子体子弹
只提供摘要形式。从等离子体扩散、等离子体漂移和气体流动的流体理论出发,描述了等离子体子弹在等离子体射流中的传播。分析了等离子体弹的起源是在等离子体射流的等离子体柱中传播的静电等离子体扩散波。等离子体扩散波、电子波和离子波以调制到电压脉冲工作频率的波包形式传播。波具有ω ~ (u d +u b +u n)k的色散关系,其中相速度为流体的添加,如漂移速度u d,气体吹速u b和等离子体扩散速度u n。在等离子体射流装置中,波被调制成波包为ω ~ u g dk,群速度为u g ~ c s 2/u n ~ (104-105) m/s,其中声速为c s ~ 103 m/s,扩散速度为u n ~ (10-102) m/s。等离子体扩散波沿等离子体密度梯度的斜率呈电阻性传播。
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