Title :
Plasma Diffusion Along a Fine Tube Positive Column
Author :
Cho, Guangsup ; Kim, Jung-Hyun ; Jeong, Jong-Mun ; Hwang, Ha-Chung ; Jin, Dong-Jun ; Koo, Je-Huan ; Choi, Eun-Ha ; Verboncoeur, John P. ; Uhm, Han-Sup
Author_Institution :
Dept. of Electrophys., Kwangwoon Univ., Seoul
fDate :
3/1/2009 12:00:00 AM
Abstract :
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.
Keywords :
argon; fluorescent lamps; neon; plasma density; plasma light propagation; plasma transport processes; Ar; Ne; ambipolar diffusion; diffusion coefficient; external electrode fluorescent lamp; fine tube positive column; glass wall; ground electrode; high-density plasma; light emission propagation velocity; mercury-free lamp; plasma diffusion speed; pressure 30 torr; total pressure; Discharge; electron temperature; external electrode fluorescent lamp (EEFL); plasma; plasma density; plasma diffusion;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2008.2011909