Abstract
An atmospheric-pressure helium plasma generated in a 2.45-GHz microwave-induced cylindrical plasma torch has been investigated. The atmospheric-pressure helium plasma can be ignited at a microwave power of less than 400 W and sustained at as low as 100 W, at a gas flow of 50 L/min. The electron temperature Te, electron density n e, and gas temperature Tg measured by optical emission spectroscopy are 0.28-0.5 eV, 10 15-1016cm-3, and 1000-2000 K, respectively, at a power of 200-400 W and a gas flow rate of 20-50 L/min. In addition, it is noted that Te Tv) > Tg Tr (rotational temperature) for these experiment parameters. These results show that the helium plasma generated in this atmospheric-pressure plasma torch is in partial local thermodynamic equilibrium (pLTE).
| Original language | English (US) |
|---|---|
| Article number | 6352927 |
| Pages (from-to) | 3476-3481 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Plasma Science |
| Volume | 40 |
| Issue number | 12 |
| DOIs | |
| State | Published - 2012 |
Keywords
- Atmospheric-pressure plasma
- laser-assisted plasma coating at atmospheric pressure (LAPCAP)
- pulsed-laser ablation
- pulsed-laser deposition
- thermal barrier coatings
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Condensed Matter Physics