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Plasma Diffusion Along a Fine Tube Positive Column

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9 Author(s)
Guangsup Cho ; Dept. of Electrophys., Kwangwoon Univ., Seoul ; Jung-Hyun Kim ; Jong-Mun Jeong ; Ha-Chung Hwang
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The propagation velocity of light emission is observed to be up ~0.92 times10+5 m/s along a tube of an inner diameter ro ~1.5 times10-3 m with an external electrode fluorescent lamp filled with 97% Ne and 3% Ar at a total pressure of 30 torr, a mercury-free lamp without phosphor coating the inside glass wall. The origin of this propagation is shown to be ambipolar diffusion with a plasma diffusion speed of up ~ (4.8/ro)Da for diffusion coefficient Da along the positive column. When a high voltage magnitude is applied at the external electrode, a high-density plasma is generated inside the hollow electrode, and the plasma diffuses along the positive column toward the ground electrode.

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Plasma Science, IEEE Transactions on  (Volume:37 ,  Issue: 3 )